CVE-2026-52930

ipc/shm: serialize orphan cleanup with shm_nattch updates

State: Published
Severity: Not scored
Published: Jun 24, 2026
Updated: Oct 15, 2026
Reserved: Jun 9, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before b1e9aef48e4d8a0c1b54fb913077b0824ed7d650Affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064Affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 1f0d01e35dbb228084d5187212e32c91a30dcbebAffected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 6560be3f6a5bb84f006f184f0c966747bb58e1a3Affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before b5107b4ce3ad45fcf369ee2058c8910620f4b5a8Affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before db752ebfdaf2c7f27cd9690ef48b616af068319cAffected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 030bbc857bd51d4b25a90d931d3f8775ef22823aAffected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 2e5c6f4fd4001562781e99bbfc7f1f0127187542Affected
LinuxLinux	3.1Affected before 3.1Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before b1e9aef48e4d8a0c1b54fb913077b0824ed7d650Affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064Affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 1f0d01e35dbb228084d5187212e32c91a30dcbebAffected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 6560be3f6a5bb84f006f184f0c966747bb58e1a3Affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before b5107b4ce3ad45fcf369ee2058c8910620f4b5a8Affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before db752ebfdaf2c7f27cd9690ef48b616af068319cAffected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 030bbc857bd51d4b25a90d931d3f8775ef22823aAffected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d to before 2e5c6f4fd4001562781e99bbfc7f1f0127187542Affected

LinuxLinux

3.1Affected
before 3.1Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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