CVE-2026-93095
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().
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://git.kernel.org/stable/c/33cda0036bc683fc888c20b04a5fc030e3e8413b
- https://git.kernel.org/stable/c/473ea7aa35615829f0de7a71e8691d69dc24e328
- https://git.kernel.org/stable/c/7898beee166c1145c0bca364d687b8437435bf1a
- https://git.kernel.org/stable/c/af48abc1b00d865c3f4c4d76b901c44115cb7162
- https://git.kernel.org/stable/c/b9729c51a8b67f8b20b8a8cf395da4be63a0c15b
- https://git.kernel.org/stable/c/e20f3b749ad241df77ec1c3e13a9c22209aa1eb3
- https://git.kernel.org/stable/c/e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20
- https://git.kernel.org/stable/c/e31985c67ba00a59d9b1340af473c1dbe6c87856
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.