CVE-2026-52930 (GCVE-0-2026-52930)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-09-08 08:49
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E",
                    "versionEndExcluding": "7.0.13",
                    "versionStartIncluding": "6.19",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
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                    "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                    "vulnerable": true
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                  {
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                    "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
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                  {
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                    "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                    "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                    "vulnerable": true
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                  {
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                    "matchCriteriaId": "1039E95A-8CC3-4C88-8FF9-5C08EEB861C9",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "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": "2026-09-08T09:18:11.377",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-06-24T08:16:23.157",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb"
          },
          {
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
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          },
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            "tags": [
              "Patch"
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          },
          {
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            "tags": [
              "Patch"
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T15:35:10+00:00",
      "cve": "CVE-2026-52930",
      "id": "CVE-2026-52930",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipc/shm: serialize orphan cleanup with shm_nattch updates",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52930.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T17:00:37Z",
      "cve": "CVE-2026-52930",
      "id": "CVE-2026-52930",
      "initial_release_date": "2026-06-25T02:19:54Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "674",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52930",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52930.json",
      "version": "12"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.