CVE-2026-45884

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: apparmor: avoid per-cpu hold underflow in aa_get_buffer When aa_get_buffer() pulls from the per-cpu list it unconditionally decrements cache->hold. If hold reaches 0 while count is still non-zero, the unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a very long time, so aa_put_buffer() never returns buffers to the global list, which can starve other CPUs and force repeated kmalloc(aa_g_path_max) allocations. Guard the decrement so hold never underflows. A flaw was found in the Linux kernel’s AppArmor module. A local attacker could exploit an integer underflow vulnerability in the aa_get_buffer() function. This flaw prevents buffers from being returned to the global list, potentially leading to resource exhaustion and a Denial of Service (DoS) condition for other central processing units (CPUs).

Live-patch status from KernelCare for each operating system.