CVE-2026-23415futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
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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().
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c042c505210dc3453f378df432c10fff3d471bc5 before 853f70c67d1b37e368fdcb3e328c4b8c04f53ac0; from c042c505210dc3453f378df432c10fff3d471bc5 before 7e196194ea27bd49adf3551e2aceb83498eb73fe; from c042c505210dc3453f378df432c10fff3d471bc5 before 190a8c48ff623c3d67cb295b4536a660db2012aa | CNA record |
linux linux_kernel linux:linux_kernel | from 6.16.1 before 6.18.21; from 6.19 before 6.19.11; 6.16; 7.0; 7.0; 7.0; 7.0; 7.0; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/853f70c67d1b37e368fdcb3e328c4b8c04f53ac0patch
- https://git.kernel.org/stable/c/7e196194ea27bd49adf3551e2aceb83498eb73fepatch
- https://git.kernel.org/stable/c/190a8c48ff623c3d67cb295b4536a660db2012aapatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.