Medium 5.5Published Jun 24, 2026

CVE-2026-52930ipc/shm: serialize orphan cleanup with shm_nattch updates

Updated under an hour ago (Oct 28, 2026, 8:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d before b1e9aef48e4d8a0c1b54fb913077b0824ed7d650; from 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d before 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064; 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d builds before 1f0d01e35dbb228084d5187212e32c91a30dcbeb; from 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d before 6560be3f6a5bb84f006f184f0c966747bb58e1a3; from 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d before b5107b4ce3ad45fcf369ee2058c8910620f4b5a8; from 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d before db752ebfdaf2c7f27cd9690ef48b616af068319c; from 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d before 030bbc857bd51d4b25a90d931d3f8775ef22823a; 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d builds before 2e5c6f4fd4001562781e99bbfc7f1f0127187542	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 6 more ranges	NVD

References

References

https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650	patch
https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064	patch
https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb	patch
https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3	patch
https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8	patch
https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c	patch
https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a	patch
https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.