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.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < b1e9aef48e4d8a0c1b54fb913077b0824ed7d650; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < 1f0d01e35dbb228084d5187212e32c91a30dcbeb; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < 6560be3f6a5bb84f006f184f0c966747bb58e1a3; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < b5107b4ce3ad45fcf369ee2058c8910620f4b5a8; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < db752ebfdaf2c7f27cd9690ef48b616af068319c; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < 030bbc857bd51d4b25a90d931d3f8775ef22823a; >= 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d, < 2e5c6f4fd4001562781e99bbfc7f1f0127187542 |
| Linux | Linux | 3.1 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) | >= V3.1.6, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) | >= V3.1.7, < * |
References
- https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823aPatch
- https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbebPatch
- https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542Patch
- https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3Patch
- https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064Patch
- https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650Patch
- https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8Patch
- https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319cPatch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Timeline
- Published
- Jun 24, 2026
- Last modified
- Nov 10, 2026
- NVD status
- Modified