{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d"
            },
            {
              "fixed": "b1e9aef48e4d8a0c1b54fb913077b0824ed7d650"
            },
            {
              "fixed": "92cda2593cf2ed25b0e9d78e5e6d8303bba1a064"
            },
            {
              "fixed": "1f0d01e35dbb228084d5187212e32c91a30dcbeb"
            },
            {
              "fixed": "6560be3f6a5bb84f006f184f0c966747bb58e1a3"
            },
            {
              "fixed": "b5107b4ce3ad45fcf369ee2058c8910620f4b5a8"
            },
            {
              "fixed": "db752ebfdaf2c7f27cd9690ef48b616af068319c"
            },
            {
              "fixed": "030bbc857bd51d4b25a90d931d3f8775ef22823a"
            },
            {
              "fixed": "2e5c6f4fd4001562781e99bbfc7f1f0127187542"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52930.json"
  },
  "details": "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",
  "modified": "2026-07-10T03:54:18.791324839Z",
  "published": "2026-06-24T07:14:22.704Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52930.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52930"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "ipc/shm: serialize orphan cleanup with shm_nattch updates"
}