ipc/shm: serialize orphan cleanup with shm_nattch updates
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.
CVE-2026-52930
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-52930
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "b1e9aef48e4d8a0c1b54fb913077b0824ed7d650",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "92cda2593cf2ed25b0e9d78e5e6d8303bba1a064",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "1f0d01e35dbb228084d5187212e32c91a30dcbeb",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "6560be3f6a5bb84f006f184f0c966747bb58e1a3",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "b5107b4ce3ad45fcf369ee2058c8910620f4b5a8",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "db752ebfdaf2c7f27cd9690ef48b616af068319c",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "030bbc857bd51d4b25a90d931d3f8775ef22823a",
"versionType": "git"
},
{
"status": "affected",
"version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
"lessThan": "2e5c6f4fd4001562781e99bbfc7f1f0127187542",
"versionType": "git"
}
],
"programFiles": [
"ipc/shm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"ipc/shm.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52930
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28419 · Revision 1
- Added to Heist Feed
- Publisher date