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.

EPSS — Exploit Prediction

0.0017

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542 https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3 https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c

Frequently Asked Questions

What is CVE-2026-52930? +

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 do I check if I'm vulnerable to CVE-2026-52930? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Description

EPSS — Exploit Prediction

References

Other References

Frequently Asked Questions

Don't wait for an exploit