CVE-2026-52930

UNKNOWN 0.0

ipc/shm: serialize orphan cleanup with shm_nattch updates

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	linux
Product	linux
Ecosystems	Linux Kernel
Industries	Technology
Published	Jun 24, 2026

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Affected Versions

Linux / Linux

4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < 1f0d01e35dbb228084d5187212e32c91a30dcbeb 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < 6560be3f6a5bb84f006f184f0c966747bb58e1a3 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < db752ebfdaf2c7f27cd9690ef48b616af068319c 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < 030bbc857bd51d4b25a90d931d3f8775ef22823a 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d < 2e5c6f4fd4001562781e99bbfc7f1f0127187542

Linux / Linux

3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗