CVE-2026-52930
N/AIn the Linux kernel, the following vulnerability has been resolved: ipc/shm: serialize orphan cleanup with shm_nattch updates shm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that does not serialize all fields tested by shm_may_destroy(). In particular, shm_nattch is updated while holding shm_perm.lock, and attach paths can do that without holding the rwsem. Do not decide that an orphaned segment is unused before taking the object lock. Move the shm_may_destroy() check under shm_perm.lock, matching the other destroy paths, and unlock the segment when it no longer qualifies for removal.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 6th percentile
Impact if exploited
—CVSS · not scored
- No impact metrics
References
Technical & other
- https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
- https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
- https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb
- https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3
- https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
- https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c
- https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a
- https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542