CVE-2026-23415

In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During futex_key_to_node_opt() execution, vma->vm_policy is read under speculative mmap lock and RCU. Concurrently, mbind() may call vma_replace_policy() which frees the old mempolicy immediately via kmem_cache_free(). This creates a race where __futex_key_to_node() dereferences a freed mempolicy pointer, causing a use-after-free read of mpol->mode. [ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349) [ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87 [ 151.415969] Call Trace: [ 151.416732] __asan_load2 (mm/kasan/generic.c:271) [ 151.416777] __futex_key_to_node (kernel/futex/core.c:349) [ 151.416822] get_futex_key (kernel/futex/core.c:374 kernel/futex/core.c:386 kernel/futex/core.c:593) Fix by adding rcu to __mpol_put().

The following products are affected by CVE-2026-23415 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23415.

URL	Resource
https://git.kernel.org/stable/c/190a8c48ff623c3d67cb295b4536a660db2012aa
https://git.kernel.org/stable/c/7e196194ea27bd49adf3551e2aceb83498eb73fe
https://git.kernel.org/stable/c/853f70c67d1b37e368fdcb3e328c4b8c04f53ac0
https://lore.kernel.org/linux-cve-announce/2026040204-CVE-2026-23415-3435@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-23415
https://www.cve.org/CVERecord?id=CVE-2026-23415