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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Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
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          "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."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-06-24T07:14:22.704Z",
    "dateReserved": "2026-06-09T07:44:35.369Z",
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    "state": "PUBLISHED"
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}


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Nomenclature

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