CVE-2026-23415
- Source
- https://cve.org/CVERecord?id=CVE-2026-23415
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23415.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-23415
- Downstream
- Published
- 2026-04-02T11:40:56.476Z
- Modified
- 2026-07-15T01:48:58.305472748Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futexkeytonodeopt() and vmareplacepolicy()
During futexkeytonodeopt() execution, vma->vmpolicy is read under speculative mmap lock and RCU. Concurrently, mbind() may call vmareplacepolicy() which frees the old mempolicy immediately via kmemcache_free().
This creates a race where _futexkeytonode() dereferences a freed mempolicy pointer, causing a use-after-free read of mpol->mode.
[ 151.412631] BUG: KASAN: slab-use-after-free in _futexkeytonode (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] _futexkeytonode (kernel/futex/core.c:349) [ 151.416822] getfutexkey (kernel/futex/core.c:374 kernel/futex/core.c:386 kernel/futex/core.c:593)
Fix by adding rcu to _mpolput().
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23415.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/190a8c48ff623c3d67cb295b4536a660db2012aa
- https://git.kernel.org/stable/c/7e196194ea27bd49adf3551e2aceb83498eb73fe
- https://git.kernel.org/stable/c/853f70c67d1b37e368fdcb3e328c4b8c04f53ac0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23415.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-23415
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git