ipc/shm: serialize orphan cleanup with shm_nattch updates
Summary
| CVE | CVE-2026-52930 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 08:16:23 UTC |
| Updated | 2026-06-24 08:16:23 UTC |
| 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. |
Risk And Classification
EPSS: 0.001650000 probability, percentile 0.060690000 (date 2026-06-28)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d 1f0d01e35dbb228084d5187212e32c91a30dcbeb git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d 6560be3f6a5bb84f006f184f0c966747bb58e1a3 git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d db752ebfdaf2c7f27cd9690ef48b616af068319c git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d 030bbc857bd51d4b25a90d931d3f8775ef22823a git | Not specified |
| CNA | Linux | Linux | affected 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d 2e5c6f4fd4001562781e99bbfc7f1f0127187542 git | Not specified |
| CNA | Linux | Linux | affected 3.1 | Not specified |
| CNA | Linux | Linux | unaffected 3.1 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.259 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.210 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.176 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.94 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.36 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.13 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.