In the Linux kernel, the following vulnerability has been resolved:
ceph: lock mutex in ceph_mds_check_access()
MDS session OPEN handling replaces mdsc->s_cap_auths under
mdsc->mutex, freeing the previous array and its strings.
ceph_mds_check_access() traverses this array without holding the
mutex. A concurrent session reopen can therefore free the array while
it is being inspected, resulting in a use-after-free like this:
Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9
[...]
Internal error: Oops: 0000000096000004 [#1] SMP
Modules linked in:
CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE
[..]
pc : ceph_mds_check_access+0xd4/0x550
lr : ceph_mds_check_access+0xc8/0x550
[...]
Call trace:
ceph_mds_check_access+0xd4/0x550 (P)
ceph_atomic_open+0x138/0xbe8
path_openat+0xa24/0xfa8
do_filp_open+0x94/0x158
do_sys_openat2+0x88/0xf8
ceph: lock mutex in ceph_mds_check_access()
MDS session OPEN handling replaces mdsc->s_cap_auths under
mdsc->mutex, freeing the previous array and its strings.
ceph_mds_check_access() traverses this array without holding the
mutex. A concurrent session reopen can therefore free the array while
it is being inspected, resulting in a use-after-free like this:
Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9
[...]
Internal error: Oops: 0000000096000004 [#1] SMP
Modules linked in:
CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE
[..]
pc : ceph_mds_check_access+0xd4/0x550
lr : ceph_mds_check_access+0xc8/0x550
[...]
Call trace:
ceph_mds_check_access+0xd4/0x550 (P)
ceph_atomic_open+0x138/0xbe8
path_openat+0xa24/0xfa8
do_filp_open+0x94/0x158
do_sys_openat2+0x88/0xf8
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 16 Sep 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: ceph: lock mutex in ceph_mds_check_access() MDS session OPEN handling replaces mdsc->s_cap_auths under mdsc->mutex, freeing the previous array and its strings. ceph_mds_check_access() traverses this array without holding the mutex. A concurrent session reopen can therefore free the array while it is being inspected, resulting in a use-after-free like this: Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9 [...] Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE [..] pc : ceph_mds_check_access+0xd4/0x550 lr : ceph_mds_check_access+0xc8/0x550 [...] Call trace: ceph_mds_check_access+0xd4/0x550 (P) ceph_atomic_open+0x138/0xbe8 path_openat+0xa24/0xfa8 do_filp_open+0x94/0x158 do_sys_openat2+0x88/0xf8 | |
| Title | ceph: lock mutex in ceph_mds_check_access() | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-16T10:33:04.371Z
Reserved: 2026-09-11T19:38:34.780Z
Link: CVE-2026-89990
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-16T11:17:10.133
Modified: 2026-09-16T11:17:10.133
Link: CVE-2026-89990
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.