Description
In the Linux kernel, the following vulnerability has been resolved: audit: avoid dropping live tree ref on fsnotify rule autoremove audit_del_rule() is used for both netlink deletion templates and internal fsnotify autoremove. The former passes a parsed template which owns a temporary tree reference; the latter passes the installed entry itself. The unconditional audit_put_tree() at the end of audit_del_rule() assumes the template case. For mixed AUDIT_DIR plus AUDIT_EXE rules, an fsnotify autoremove event therefore drops the installed rule's live tree reference. Repeating this across rules sharing the same tree can free the tree while another rule still references it, and a later autoremove dereferences the freed pathname while comparing rules. Move the temporary-tree put to audit_rule_change(), the caller that owns deletion templates. Keep it in the AUDIT_DEL_RULE cleanup so both successful deletion and -ENOENT still release the parser-owned tree. [PM: dropped unnecessary comment for line length reasons]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < b322cc7adcd2e6ec1594d187533a126506ab545caffected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 695c85dc345a4e0292739f004c261bedef3f27e6affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 01b0ec8c397be65ff710777c97017ca1de56ef8eaffected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 636a99bab36ba27515363d325866c0273ac83b3eaffected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 583cf579b32d99e3fe4e9c8ecc4d852e3708fbecaffected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 783f0f0974c156aca630f4ffff248671082a098daffected
Linux Linux
Default version status: affected
4.3affected0 to < 4.3unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58 ↗
- https://git.kernel.org/stable/c/b322cc7adcd2e6ec1594d187533a126506ab545c ↗
- https://git.kernel.org/stable/c/695c85dc345a4e0292739f004c261bedef3f27e6 ↗
- https://git.kernel.org/stable/c/01b0ec8c397be65ff710777c97017ca1de56ef8e ↗
- https://git.kernel.org/stable/c/cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 ↗
- https://git.kernel.org/stable/c/636a99bab36ba27515363d325866c0273ac83b3e ↗
- https://git.kernel.org/stable/c/583cf579b32d99e3fe4e9c8ecc4d852e3708fbec ↗
- https://git.kernel.org/stable/c/783f0f0974c156aca630f4ffff248671082a098d ↗