In the Linux kernel, the following vulnerability has been resolved:
hfsplus: validate thread record before delete key rebuild
hfsplus_delete_cat() is called with str == NULL when the last open
reference to an unlinked HFS+ hardlink backing inode is closed. In that
case, the function finds the catalog thread by CNID and rebuilds the
catalog key from thread.nodeName.
That reconstruction path reads thread.nodeName.length directly from the
catalog B-tree into fd.search_key and then copies length * 2 bytes into
fd.search_key->cat.name.unicode. It does not first check that the found
record is a thread record or that its size matches the thread name.
A corrupted image can therefore provide an oversized thread name length
and make hfs_bnode_read() write past the catalog search-key allocation.
Read the CNID record through hfsplus_brec_read_cat(), which bounds the
record read to sizeof(hfsplus_cat_entry) and verifies that a thread
record's size exactly matches nodeName.length. Together, these checks
ensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread
records before building the delete key from the validated thread name.
Share the thread-record-type helper between hfsplus_find_cat() and
hfsplus_delete_cat().
hfsplus: validate thread record before delete key rebuild
hfsplus_delete_cat() is called with str == NULL when the last open
reference to an unlinked HFS+ hardlink backing inode is closed. In that
case, the function finds the catalog thread by CNID and rebuilds the
catalog key from thread.nodeName.
That reconstruction path reads thread.nodeName.length directly from the
catalog B-tree into fd.search_key and then copies length * 2 bytes into
fd.search_key->cat.name.unicode. It does not first check that the found
record is a thread record or that its size matches the thread name.
A corrupted image can therefore provide an oversized thread name length
and make hfs_bnode_read() write past the catalog search-key allocation.
Read the CNID record through hfsplus_brec_read_cat(), which bounds the
record read to sizeof(hfsplus_cat_entry) and verifies that a thread
record's size exactly matches nodeName.length. Together, these checks
ensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread
records before building the delete key from the validated thread name.
Share the thread-record-type helper between hfsplus_find_cat() and
hfsplus_delete_cat().
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
Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: hfsplus: validate thread record before delete key rebuild hfsplus_delete_cat() is called with str == NULL when the last open reference to an unlinked HFS+ hardlink backing inode is closed. In that case, the function finds the catalog thread by CNID and rebuilds the catalog key from thread.nodeName. That reconstruction path reads thread.nodeName.length directly from the catalog B-tree into fd.search_key and then copies length * 2 bytes into fd.search_key->cat.name.unicode. It does not first check that the found record is a thread record or that its size matches the thread name. A corrupted image can therefore provide an oversized thread name length and make hfs_bnode_read() write past the catalog search-key allocation. Read the CNID record through hfsplus_brec_read_cat(), which bounds the record read to sizeof(hfsplus_cat_entry) and verifies that a thread record's size exactly matches nodeName.length. Together, these checks ensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread records before building the delete key from the validated thread name. Share the thread-record-type helper between hfsplus_find_cat() and hfsplus_delete_cat(). | |
| Title | hfsplus: validate thread record before delete key rebuild | |
| 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: 2026-09-17T16:11:09.694Z
Reserved: 2026-09-17T16:02:15.084Z
Link: CVE-2026-93095
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:18:03.557
Modified: 2026-09-17T17:18:03.557
Link: CVE-2026-93095
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.