CVE-2026-93095: Linux Vulnerability (CVSS 7.8)

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().

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 33cda0036bc683fc888c20b04a5fc030e3e8413b; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b9729c51a8b67f8b20b8a8cf395da4be63a0c15b; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < af48abc1b00d865c3f4c4d76b901c44115cb7162; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e20f3b749ad241df77ec1c3e13a9c22209aa1eb3; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7898beee166c1145c0bca364d687b8437435bf1a; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e31985c67ba00a59d9b1340af473c1dbe6c87856; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 473ea7aa35615829f0de7a71e8691d69dc24e328; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20
Linux	Linux	2.6.12

References

Timeline

Published: Sep 17, 2026
Last Modified: Sep 18, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-93095?

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().

How severe is CVE-2026-93095?

CVE-2026-93095 has a CVSS score of 7.8/10 (HIGH severity).

How do I fix CVE-2026-93095?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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