CVE-2026-52930
Description
In 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.
How to fix
- linux linux_kernel5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 or later
- git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a
- git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb
- git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542
- git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3
- git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
- git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
- git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
- git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.1 ≤ v < 5.10.259, 5.11 ≤ v < 5.15.210, 5.16 ≤ v < 6.1.176, 6.2 ≤ v < 6.6.143, 6.7 ≤ v < 6.12.94, 6.13 ≤ v < 6.18.36, 6.19 ≤ v < 7.0.13, 7.1 | 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 |
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