CVE-2026-52930 (GCVE-0-2026-52930)
Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14
VLAI?
Title
ipc/shm: serialize orphan cleanup with shm_nattch updates
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
(git)
Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 (git) Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < 1f0d01e35dbb228084d5187212e32c91a30dcbeb (git) Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < 6560be3f6a5bb84f006f184f0c966747bb58e1a3 (git) Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 (git) Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < db752ebfdaf2c7f27cd9690ef48b616af068319c (git) Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < 030bbc857bd51d4b25a90d931d3f8775ef22823a (git) Affected: 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d , < 2e5c6f4fd4001562781e99bbfc7f1f0127187542 (git) |
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{
"containers": {
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"programFiles": [
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.1"
},
{
"lessThan": "3.1",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"cpeMatch": [
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"versionStartIncluding": "3.1",
"vulnerable": true
},
{
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},
{
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{
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{
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}
],
"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipc/shm: serialize orphan cleanup with shm_nattch updates\n\nshm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that\ndoes not serialize all fields tested by shm_may_destroy(). In particular,\nshm_nattch is updated while holding shm_perm.lock, and attach paths can do\nthat without holding the rwsem.\n\nDo not decide that an orphaned segment is unused before taking the object\nlock. Move the shm_may_destroy() check under shm_perm.lock, matching the\nother destroy paths, and unlock the segment when it no longer qualifies\nfor removal."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-24T07:14:22.704Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650"
},
{
"url": "https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064"
},
{
"url": "https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb"
},
{
"url": "https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3"
},
{
"url": "https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8"
},
{
"url": "https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c"
},
{
"url": "https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a"
},
{
"url": "https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542"
}
],
"title": "ipc/shm: serialize orphan cleanup with shm_nattch updates",
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"cveMetadata": {
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"cveId": "CVE-2026-52930",
"datePublished": "2026-06-24T07:14:22.704Z",
"dateReserved": "2026-06-09T07:44:35.369Z",
"dateUpdated": "2026-06-24T07:14:22.704Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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