| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| In the Linux kernel, the following vulnerability has been resolved:
xfs: fix unit conversions in per_binval computation
LOLLM noticed that we're doing the unit conversion in the per_binval
computation backwards -- xfs_buf_inval_log_space's second parameter is
supposed to be in bytes, but max_binval is in units of fsblocks. Hence
the conversion should be FSB -> B, not the other way around. |
| In the Linux kernel, the following vulnerability has been resolved:
smb: client: avoid leaking refcount in cifs_queue_oplock_break()
cifs_queue_oplock_break() unconditionally takes a reference on the
target file before queueing cifs_oplock_break(). Only that work item
decreases the reference counter again.
If another oplock break arrives while that work is still queued,
queue_work() will return false and not queue this second work item. As a
result, we will never reach the point to drop the file reference again
and are leaking this reference. This can be triggered when interacting
with a slow-responding server.
As a result, later unmount operations for this file system will fail with
BUG: Dentry ... still in use (1) [unmount of cifs cifs]
VFS: Busy inodes after unmount of cifs (cifs)
kernel BUG at fs/super.c:777!
Fix this by only incrementing the reference count if the work has been
queued successfully. Taking it after queue_work() is safe because all
three callers hold tcon->open_file_lock across the call and
_cifsFileInfo_put() decrements under that same lock, so a worker that
starts the handler in the window cannot drop the reference before it has
been taken. |
| In the Linux kernel, the following vulnerability has been resolved:
inet: frags: invalidate queues before flushing them
fqdir_pre_exit() flushes the skbs from incomplete queues without
changing their completion state. A fragment which found a queue before
high_thresh was cleared can then acquire the queue lock and reuse stale
reassembly metadata. A queue concurrently killed after fqdir->dead is
set can instead become INET_FRAG_COMPLETE|INET_FRAG_HASH_DEAD while
still holding its old skbs; skipping it because it is complete leaves
those references behind until asynchronous fqdir teardown.
For IPv6, stale metadata can make ip6_frag_reasm() use the old
nhoffset with a new skb and access memory out of bounds. The resulting
heap corruption can be leveraged for local privilege escalation when
unprivileged network namespaces are available. Unflushed fragments can
also keep conntrack references alive after the conntrack per-net
cleanup point.
Kill each incomplete queue, then flush every queue still owned by the
dying rhashtable. HASH_DEAD identifies that ownership, while complete
queues without it are already owned by another destroy path and must be
left alone. Releasing a timer reference removed by inet_frag_kill() is
deferred to inet_frag_putn(), after the queue lock is dropped.
KASAN report:
BUG: KASAN: slab-out-of-bounds in ipv6_frag_rcv (net/ipv6/reassembly.c:289 (discriminator 2) net/ipv6/reassembly.c:229 (discriminator 2) net/ipv6/reassembly.c:391 (discriminator 2))
Write of size 1 at addr ff110001039c6e00 by task poc/771
Call Trace:
? ipv6_frag_rcv (net/ipv6/reassembly.c:289 (discriminator 2) net/ipv6/reassembly.c:229 (discriminator 2) net/ipv6/reassembly.c:391 (discriminator 2))
ipv6_frag_rcv (net/ipv6/reassembly.c:289 (discriminator 2) net/ipv6/reassembly.c:229 (discriminator 2) net/ipv6/reassembly.c:391 (discriminator 2))
ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479 (discriminator 5))
ip6_input_finish (net/ipv6/ip6_input.c:534)
ipv6_rcv (include/net/dst.h:480 (discriminator 3) net/ipv6/ip6_input.c:119 (discriminator 3) net/ipv6/ip6_input.c:109 (discriminator 3) include/linux/netfilter.h:325 (discriminator 3) include/linux/netfilter.h:319 (discriminator 3) net/ipv6/ip6_input.c:351 (discriminator 3))
packet_sendmsg (net/packet/af_packet.c:3110 net/packet/af_packet.c:3142)
__x64_sys_sendmmsg (net/socket.c:2883 net/socket.c:2880 net/socket.c:2880)
The buggy address belongs to the object at ff110001039c6b40
which belongs to the cache skbuff_small_head of size 704
The buggy address is located 0 bytes to the right of
allocated 704-byte region [ff110001039c6b40, ff110001039c6e00)
BUG: KASAN: slab-out-of-bounds in ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:423 (discriminator 1))
Read of size 1 at addr ff110001039c6e08 by task poc/771
Call Trace:
? ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:423 (discriminator 1))
ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:423 (discriminator 1))
ip6_input_finish (net/ipv6/ip6_input.c:534)
ipv6_rcv (include/net/dst.h:480 (discriminator 3) net/ipv6/ip6_input.c:119 (discriminator 3) net/ipv6/ip6_input.c:109 (discriminator 3) include/linux/netfilter.h:325 (discriminator 3) include/linux/netfilter.h:319 (discriminator 3) net/ipv6/ip6_input.c:351 (discriminator 3))
packet_sendmsg (net/packet/af_packet.c:3110 net/packet/af_packet.c:3142)
__x64_sys_sendmmsg (net/socket.c:2883 net/socket.c:2880 net/socket.c:2880)
packet_sendmsg (net/packet/af_packet.c:2959 net/packet/af_packet.c:3053 net/packet/af_packet.c:3142)
__x64_sys_sendmmsg (net/socket.c:2883 net/socket.c:2880 net/socket.c:2880)
The buggy address belongs to the object at ff110001039c6b40
which belongs to the cache skbuff_small_head of size 704
The buggy address is located 8 bytes to the right of
allocated 704-byte region [ff110001039c6b40, ff110001039c6e00) |
| In the Linux kernel, the following vulnerability has been resolved:
erofs: preserve LZMA decoders on resize failure
The pool-resize path frees each stream's old decoder before allocating
its replacement. If an allocation fails after some streams have already
been replaced, the failed stream is put back on the list with state ==
NULL. z_erofs_lzma_max_dictsize is still advanced as if the whole
pool had been resized.
An existing LZMA mount can select the broken stream and pass
NULL to xz_dec_microlzma_reset(). A retry at the same size also
skip another resize attempt. Since the global maximum was advanced,
thus, the invalid state is left unrepaired.
Allocate each replacement before freeing the old decoder, temporarily
retaining one old decoder during allocation. Stop at the first failure
and advance z_erofs_lzma_max_dictsize only after all streams satisfy
the request.
Record each stream's dictionary capacity so retries can skip streams
already enlarged before a partial failure. |
| In the Linux kernel, the following vulnerability has been resolved:
ufs: create the root dentry after loading cylinder metadata
ufs_fill_super() installed sb->s_root before it loaded the cylinder
group structures for a writable mount:
sb->s_root = d_make_root(inode);
...
if (!sb_rdonly(sb))
if (!ufs_read_cylinder_structures(sb))
goto failed;
When ufs_read_cylinder_structures() failed, the error path freed the
in-core superblock information and set sb->s_fs_info to NULL while
sb->s_root stayed installed. get_tree_bdev() then reached
deactivate_locked_super(), and because s_root was present,
generic_shutdown_super() called sync_filesystem() and the put_super
operation. Both dereference UFS_SB(sb), which is now NULL, so a mount
that fails only while reading the cylinder groups oopses during
teardown. A crafted image whose first cylinder group cannot be read
reaches this path.
Load the cylinder group metadata first and create the root dentry last,
so the superblock is published to the VFS only once it is fully set up.
ufs_setup_cstotal() and ufs_read_cylinder_structures() take only the
super_block and do not use the root inode, so the reordering is safe. |
| In the Linux kernel, the following vulnerability has been resolved:
ipv6: sr: restore network header before routing and forwarding
ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH)
while skb_network_header() points at the IPv6 header.
When segments_left > 0, ipv6_srh_rcv() previously restored the skb->data
position by pushing sizeof(struct ipv6hdr), assuming the SRH immediately
followed the fixed IPv6 header. If another extension header (such as a
Hop-by-Hop options header) precedes the SRH, skb_network_offset()
remained negative.
This led to two problems:
1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes
__skb_flow_dissect() which passes the negative skb_network_offset()
to flow dissection, breaking BPF and C flow dissector logic.
2. If forwarded via ip6_forward() or redirected via act_mirred, downstream
handlers (like sch_fragment() or neighbour output) pass the negative
offset as an unsigned length, triggering OOB memcpy or buffer overflows.
Fix this by pushing -skb_network_offset(skb) before routing, ensuring
skb_network_offset(skb) is 0 for route lookup / flow dissection as well as
downstream forwarding. On the loopback path, pull skb_transport_offset(skb)
to restore skb->data to the SRH before looping back. |
| In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix BPF_F_CPU validation for sparse CPU IDs
BPF_F_CPU stores the target CPU ID in the upper 32 bits of the map
operation flags. bpf_map_check_op_flags() currently compares that ID
with num_possible_cpus(), which is the number of possible CPUs rather
than a bound on CPU IDs.
On an arm64 QEMU guest with a CPU device-tree hole, the possible CPU
mask was 0,2-3. A userspace program using raw bpf() syscalls creates
a BPF_MAP_TYPE_PERCPU_ARRAY and performs update and lookup operations
for each CPU by setting BPF_F_CPU and the CPU ID in the flags.
With the old check, CPU 1 is incorrectly accepted while valid CPU 3 is
rejected with -ERANGE. The CPU 1 update then reaches the per-CPU map
access path and triggers:
Unable to handle kernel paging request at virtual address ...
pc : __pi_memcpy_generic+0x5c/0x22c
lr : bpf_percpu_array_update+0x2dc/0x2e8
Call trace:
__pi_memcpy_generic
bpf_map_update_value
map_update_elem
__sys_bpf
Check the CPU ID against nr_cpu_ids and cpu_possible() instead. This
rejects CPU IDs outside the valid range and CPUs absent from the
possible mask, while allowing valid sparse CPU IDs. |
| In the Linux kernel, the following vulnerability has been resolved:
vhost: invalidate vring access on IOTLB transitions
When VIRTIO_F_ACCESS_PLATFORM changes, cached vring pointers and IOTLB
metadata are interpreted in a different address space. Keeping them
across the transition can leave stale ring mappings in use.
Clearing d->iotlb before taking the VQ locks also lets a worker observe
a transient NULL d->iotlb and fall back to d->umem while translating a
descriptor.
Add a common vhost_clear_device_iotlb() helper for vhost-net and
vhost-vsock. Take all VQ mutexes in index order before dropping the
device-wide IOTLB, invalidate each VQ's cached ring access and metadata,
clear pending IOTLB messages, and free the old table after the handoff.
This serializes the transition with workers and prevents mixed address
space mappings.
On the first direct-to-IOTLB transition, invalidate the cached vring
addresses. When an existing device IOTLB is replaced, preserve the
GIOVA ring addresses and reset only the metadata cache. After clearing
ACCESS_PLATFORM, userspace must configure the vring addresses for the
new address mode.
vhost_vq_invalidate_access() clears desc, avail, and used together.
Treat the VQ as invalidated only when all three are NULL, since a single
GIOVA address may legitimately be zero. |
| In the Linux kernel, the following vulnerability has been resolved:
vduse: validate virtqueue alignment
vduse_validate_config() only checks the upper bound of vq_align. Invalid
values can therefore reach vring_create_virtqueue_map(). The split-ring
helpers use align - 1 as a bit mask, so the alignment must be a non-zero
power of two. A zero value makes vring_size() drop the descriptor and
available-ring part and vring_init() leave the used ring pointer NULL.
The VIRTIO spec requires the used ring to start at an address
aligned to at least 4 bytes. Reject values below VRING_USED_ALIGN_SIZE as
well as non-power-of-two values before they reach the virtio ring helpers.
Opening a virtio-net device created with vq_align=0 triggered:
BUG: KASAN: null-ptr-deref in virtqueue_kick_prepare_split+0xe3/0x100
Read of size 2 at addr 0000000000000000 by task systemd-network/1062
Call Trace (relevant frames):
dump_stack_lvl
print_report
kasan_report
__asan_load2
virtqueue_kick_prepare_split+0xe3/0x100
virtqueue_kick_prepare+0x40/0x60
try_fill_recv+0x857/0x1250
virtnet_open+0x189/0x460
__dev_open+0x225/0x390
__dev_change_flags+0x368/0x3b0
netif_change_flags+0x56/0xc0
do_setlink.isra.0+0x68c/0x1e30
Validate the value before it reaches the virtio ring helpers. |
| In the Linux kernel, the following vulnerability has been resolved:
vhost/vdpa: reject VRING_NUM larger than device max
vhost_vring_set_num() accepts any non-zero power-of-two queue size that
fits in 16 bits. vhost-vdpa then passes that value to set_vq_num()
without comparing it with get_vq_num_max().
A process with access to /dev/vhost-vdpa-* can therefore configure a
queue larger than the device advertises. With vdpa_sim, the worker can
walk descriptors beyond the mapped descriptor ring. KASAN reports a
16-byte out-of-bounds read, corresponding to one vring_desc, in the
vringh IOTLB path:
BUG: KASAN: out-of-bounds in _copy_from_iter
Read of size 16
copy_from_iotlb
copydesc_iotlb
vringh_getdesc_iotlb
vdpasim_net_work
Cache get_vq_num_max() immediately after reset. Some backends derive
it from writable queue-size state, so querying it after SET_NUM may
return the current size instead of the device capability. Invalidate
the cached value before reset so a failed reset leaves SET_NUM
disabled.
For VHOST_SET_VRING_NUM, copy the complete vring state once and use
the same index and size for validation, vq->num, and set_vq_num().
This ensures that validation and use operate on the same copied values. |
| In the Linux kernel, the following vulnerability has been resolved:
virtio_console: do not free control-out buffers on remove
__send_control_msg() publishes &portdev->cpkt as the control-out
virtqueue cookie. remove_vqs() walks every virtqueue and passes leftover
cookies to free_buf(), which treats them as struct port_buffer and
reads sgpages.
If a control message is still on c_ovq when the device is unbound,
free_buf() reads past the ports_device object.
KASAN reported slab-out-of-bounds in free_buf():
free_buf
remove_vqs
virtcons_remove
unbind_store
The object was the ports_device allocated in virtcons_probe().
Drain c_ovq without freeing. The packet lives in portdev and is released
with it. |
| In the Linux kernel, the following vulnerability has been resolved:
virtio_ring: fix stale descriptor flags after a failed packed add
In a packed ring the AVAIL and USED bits sit in the descriptor itself,
so writing them makes that descriptor available. Those bit combinations
flip meaning on every round of the ring, tracked by a wrap counter, so
invalidating or validating a descriptor means inverting both bits.
Commit 1ce9e6055fa0 ("virtio_ring: introduce packed ring support") has
virtqueue_add_packed() make every descriptor of a chain available as it
maps the chain, and write the head last. The device consumes the ring in
order and stops at a head that is not available yet, so it never reaches
the rest.
When vring_map_one_sg() fails partway, unmap_release unmaps the segments
and restores avail_used_flags, but the descriptors it wrote to in the
ring stay marked with AVAIL and USED bits. The head is now the only
entry that keeps the device from consuming these stale entries.
For example, the ring would look like this now.
Z - pre-previous command
A - previous command
B - aborted command
C - current command
[A1 DONE] [A2 DONE] <C1 EMPTY> [B2] [B3] [Z1 DONE]
When the driver now attempts to issue the C command, the next add starts
at the same head as B. If C spans less descriptors than B, there is no
end marker because AVAIL and USED bits were still in place. And that
means the device will start interpreting these stale entries (B2/B3) as
another command entry, which then blocks the queue.
This effect typically happens in swiotlb configurations under memory
pressure, because vring_map_one_sg() can then fail with larger I/O
requests which then leads to command abortions.
There are broadly 2 ways to avoid leaving those flags behind:
1) Defer those flags too until the chain is complete.
2) Rewrite those flags for the previous wrap counter.
Implement the second option in both packed add paths. The first option
traverses the chain a second time on every successful add. The second
option invalidates all added descriptors when any add fails.
With this patch applied, a packed virtqueue keeps completing requests
after a failed add. |
| A flaw was found in evolution-data-server. Inconsistent comparison logic in the addressbook file backend allows a Flatpak application with D-Bus access to craft a malicious URI containing directory traversal sequences. This URI is stored without proper validation during contact creation or modification. Later, during contact deletion, the URI is processed with a less strict check, leading to the deletion of arbitrary files on the host filesystem. This could potentially include critical Flatpak override files. |
| In the Linux kernel, the following vulnerability has been resolved:
hwmon: (asus_rog_ryujin) Validate HID report lengths
rog_ryujin_raw_event() parses response headers and payload fields without
first checking that they are present in the received report. A short report
can therefore make the driver consume uninitialized bytes from the HID
transport buffer and expose them as sensor values through sysfs.
Validate the response header and the fields used by each response type
before parsing them. |
| In the Linux kernel, the following vulnerability has been resolved:
smb: client: reject out-of-bounds DataOffset in CIFSSMBRead()
The SMB1 synchronous read helper CIFSSMBRead() validates the server's
DataLength against CIFSMaxBufSize and the caller's count, but never
validates DataOffset. The copy source is formed as
&pSMBr->hdr.Protocol + le16_to_cpu(pSMBr->DataOffset)
and memcpy()'d for DataLength bytes with no check that the
[DataOffset, DataOffset + DataLength) range lies within the response
actually received from the server.
A malicious or compromised SMB1 server can return a response carrying
an in-range DataLength and a large DataOffset, driving the source
pointer past the end of the response buffer. The memcpy() then copies
adjacent kernel heap into the caller's read buffer (information
disclosure), or reads unmapped memory and oopses (denial of service).
SMB1 is not negotiated by default; reaching this code requires an
explicit vers=1.0 mount.
Both DataOffset and the received response length recorded in
rsp_iov.iov_len are relative to the start of the SMB header, so reject
the response unless DataOffset + DataLength fits within that length,
using overflow-safe arithmetic, before forming the source pointer.
The response length has been validated by the previous patch, so the
DataOffset and DataLength fields can be read safely here.
While here, make data_length unsigned. It holds a length derived from
unsigned on-the-wire fields and is only ever compared against unsigned
quantities; print it with %u accordingly, and add __func__ to the
cifs_dbg() calls in this function. |
| In the Linux kernel, the following vulnerability has been resolved:
bnxt_en: Prevent queue stop with deferred completions
When the driver receives a burst of packets, it can mark a BD with the
NO_CMPL bit to defer completions. The expectation is that the last
packet in the ring will have this bit unset and the completion generated
by that packet will cleanup that packet and the ones preceding it. This
helps to reduce the number of completions fired.
The suppressed completions are controlled by the driver and the number
of packets with suppressed completions scales with the size of the ring.
SW USO packets, on the other hand, have an upper bound on the maximum
number of BDs which can be consumed which does not scale with the ring
size.
So, for small rings it is possible that: a burst of packets is handed to
the driver, the driver defers completions for all of the packets because
the number of free descriptors stays above the threshold in the driver.
Then, a USO packet arrives, but the number of BDs available is not
enough and the USO code exits early.
In this case, you end up in a state where the ring is full of packets
with their completions suppressed, which can cause the queue to stop and
never be restarted.
Assuming default CONFIG_MAX_SKB_FRAGS, this is only possible for small
rings (<= 457 descriptors, below the driver default value) when
a burst of packets fills the ring, followed by a large USO packet that
can't fit. For larger rings, the delta between the completion
suppression threshold and the BDs required for SW USO is large enough
that completions will fire and this case is unreachable.
This issue was pointed out by Sashiko and while it seems fairly unlikely
given that the queue size must be small to trigger this, it is indeed
possible.
Fix this by tracking the last BD which deferred completions and
centralizing the logic for deciding when to ring the doorbell. The NO_CMPL
bit is now cleared in bnxt_txr_db_kick(), so every doorbell site is
covered, including the SW USO early exit. This guarantees the ring always
ends in a BD which generates a completion to clean it and wake the queue. |
| In the Linux kernel, the following vulnerability has been resolved:
bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
bnxt_rx_ring_reset() frees the ring buffers and then reallocates them,
ignoring the result.
bnxt_alloc_one_rx_ring() can fail in bnxt_alloc_one_tpa_info_data(), which
returns -ENOMEM on the first failed allocation and leaves the remaining
rxr->rx_tpa[] entries zeroed.
The error isn't propagated up, so the loop in bnxt_rx_ring_reset
continues and at the end the code re-enables TPA with partially
unallocated rx_tpa array.
This means that when the agg_id from hardware is mapped to a SW index in
rxr->rx_tpa[], an uninitialized slot can be chosen which would hand a
zero DMA address to the device.
Fix this by falling back to a global reset, which is what the existing
code already does when other functions fail, but unlike the other
failure cases this particular failure has to return because TPA can't
be re-enabled since the allocation failed. |
| In the Linux kernel, the following vulnerability has been resolved:
afs: Fix missing kunmap in afs_dir_search_bucket()
Fix afs_dir_search_bucket() to kunmap the block it's using in the "bad:"
path. |
| In the Linux kernel, the following vulnerability has been resolved:
s390/crypto: Fix missing scrub of temp buffers with AES ctr and gcm algorithm
In function ctr_aes_crypt() there is a buffer used to process
remaining bytes < AES_BLOCK_SIZE. This buffer was not scrubbed and
thus could lead to expose of unwanted data. When the buffer is used
explicitly scrub it at the end of the code block to avoid exposure of
maybe sensitive data.
In a similar way the function gcm_aes_crypt() hat an error path where
the CPACF param block was not scrubbed. Instead of return early now
these error paths go to end of function where explicit scrubbing is
done. Similar with the buffers which are part of the gcm_sg_walk
structs from the variables gw_in and gw_out. |
| In the Linux kernel, the following vulnerability has been resolved:
fs: don't return -EINVAL for successful nested thaw
Commit 7366f8b6fc6a ("fs: handle freezing from multiple devices")
replaced the freeze_holders bitmask with per-holder counters to allow
nested freezes. In the bitmask version, a thaw that released a shared
hold while another holder remained returned 0. Since the rework,
thaw_super_locked() drops the freeze reference via freeze_dec() but
then returns -EINVAL when other freezers remain, misinforming the
caller: the thaw did succeed, the superblock just stays frozen for the
remaining holders.
This breaks bdev-initiated freezing. When a filesystem is frozen with
FIFREEZE and additionally frozen via bdev_freeze() -- which nests by
design, see fs_bdev_freeze() -- the subsequent bdev_thaw() receives
-EINVAL from the holder op although its freeze reference was dropped,
and therefore keeps bd_fsfreeze_count elevated. Then device-mapper's
unlock_fs() ignores bdev_thaw()'s return value, so nothing rebalances
the count. After the user's FITHAW and umount, the block device can
never be mounted again:
dm-1: Can't mount, blockdev is frozen
There is no way for userspace to drop the leaked count; only
destroying the block device (or a reboot) recovers the device.
Reproducer (any kernel since v6.8):
dmsetup create dut --table "0 $(blockdev --getsz "$DEV") linear $DEV 0"
mkfs.ext4 /dev/mapper/dut
mount /dev/mapper/dut /mnt
fsfreeze --freeze /mnt # freeze_ucount == 1
dmsetup suspend dut # bd_fsfreeze_count == 1, ucount == 2
dmsetup resume dut # ucount 2 -> 1, but thaw_super()
# returns -EINVAL, so bdev_thaw()
# keeps bd_fsfreeze_count at 1
fsfreeze --unfreeze /mnt # filesystem thaws fine
umount /mnt
mount /dev/mapper/dut /mnt # EBUSY, forever
The same happens with fsfreeze held across an LVM snapshot of the
origin volume.
fs_bdev_thaw()'s documentation already describes the intended
semantics: "If this function returns zero it doesn't mean that the
filesystem is unfrozen as it may have been frozen multiple times".
Restore them by returning 0 when a nested thaw drops its hold while
other freezers remain. Thawing without holding a freeze still fails
with -EINVAL as may_unfreeze() rejects that case before the reference
count is touched. |
