CVE-2026-98862audit: fix exe mark UAF in kill_rules()

Official 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 packages & fixed versions

Affected products (as reported)

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