Description
In the Linux kernel, the following vulnerability has been resolved: audit: fix exe mark UAF in kill_rules() kill_rules() removes mixed AUDIT_DIR and AUDIT_EXE rules when an audit tree is pruned. It drops entry->rule.exe before removing the rule from the RCU-visible filter lists. After a rule has been installed with AUDIT_ADD_RULE, which requires CAP_AUDIT_CONTROL, removing the watched directory can race with another task that is still evaluating the rule. In that case, fsnotify can free the executable mark before the reader reaches audit_mark_compare(), causing a use-after-free. KASAN reports: BUG: KASAN: slab-use-after-free in audit_mark_compare+0x8d/0xa0 Unlink the published rules from the RCU-visible lists and retain them on tree->rules for cleanup. If any rule has an executable mark, wait for a single RCU grace period before removing the marks and scheduling the entries for freeing. Otherwise, call_rcu() already provides the required deferred freeing without a synchronous wait.
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 < 8d9c97fb262067933ff4452db19e692d26622352affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 11715656540360906235d724fde5349631425073affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 0afb9202c1fb88387d0577524bf9785664bdd802affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 9aee3caeff4dd4126d84f67607b95cec8719b867affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 304960900991157e6883bdf0b39782b690545ee8affected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < 88633025f20ba9c32ccdb3efc86eafdf98cb825caffected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < f2cc5462b78559c7628a9f8ac9a9592e7783183aaffected34d99af52ad40bd498ba66970579a5bc1fb1a3bc to < aa650d87a498844060eecb1d336f4d46f4d1b0b3affected
Linux Linux
Default version status: affected
4.3affected0 to < 4.3unaffected5.10.273 to ≤ 5.10.*unaffected5.15.224 to ≤ 5.15.*unaffected6.1.191 to ≤ 6.1.*unaffected6.6.160 to ≤ 6.6.*unaffected6.12.113 to ≤ 6.12.*unaffected6.18.56 to ≤ 6.18.*unaffected7.2.10 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/8d9c97fb262067933ff4452db19e692d26622352 ↗
- https://git.kernel.org/stable/c/11715656540360906235d724fde5349631425073 ↗
- https://git.kernel.org/stable/c/0afb9202c1fb88387d0577524bf9785664bdd802 ↗
- https://git.kernel.org/stable/c/9aee3caeff4dd4126d84f67607b95cec8719b867 ↗
- https://git.kernel.org/stable/c/304960900991157e6883bdf0b39782b690545ee8 ↗
- https://git.kernel.org/stable/c/88633025f20ba9c32ccdb3efc86eafdf98cb825c ↗
- https://git.kernel.org/stable/c/f2cc5462b78559c7628a9f8ac9a9592e7783183a ↗
- https://git.kernel.org/stable/c/aa650d87a498844060eecb1d336f4d46f4d1b0b3 ↗