FKIE_CVE-2026-52930

Vulnerability from fkie_nvd - Published: 2026-06-24 08:16 - Updated: 2026-06-24 08:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "ipc/shm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b1e9aef48e4d8a0c1b54fb913077b0824ed7d650",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "92cda2593cf2ed25b0e9d78e5e6d8303bba1a064",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "1f0d01e35dbb228084d5187212e32c91a30dcbeb",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "6560be3f6a5bb84f006f184f0c966747bb58e1a3",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "b5107b4ce3ad45fcf369ee2058c8910620f4b5a8",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "db752ebfdaf2c7f27cd9690ef48b616af068319c",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "030bbc857bd51d4b25a90d931d3f8775ef22823a",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            },
            {
              "lessThan": "2e5c6f4fd4001562781e99bbfc7f1f0127187542",
              "status": "affected",
              "version": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "ipc/shm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-52930",
  "lastModified": "2026-06-24T08:16:23.157",
  "metrics": {},
  "published": "2026-06-24T08:16:23.157",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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