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CVE-2026-92508

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in ib_free_cq() When accessing a CQ via the netlink path the only synchronization mechanism for the said CQ is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_free_cq(), which is too late, since by that point vendor-specific resources associated with the CQ might already be freed. This can leave a short window where the CQ remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources ensuring that the CQ is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a CQ that is in the process of destruction.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-17 17:17:53.433000
Last modified
2026-10-19 10:16:51.113000
View original CVE JSON 
{
  "id": "CVE-2026-92508",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:53.433",
  "lastModified": "2026-10-19T10:16:51.113",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in ib_free_cq()\n\nWhen accessing a CQ via the netlink path the only synchronization\nmechanism for the said CQ is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\nib_free_cq(), which is too late, since by that point\nvendor-specific resources associated with the CQ might already be\nfreed. This can leave a short window where the CQ remains accessible\nthrough restrack, leading to a potential use-after-free.\n\nFix this by moving the rdma_restrack_del() call to be before the freeing\nof the vendor-specific resources ensuring that the CQ is removed from\nrestrack before its internal resources are released.\nThis guarantees that no new users hold references to a CQ that is in\nthe process of destruction."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/infiniband/core/cq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "a804b162f9bc2b38b2ed1b4752eea9faadb1645b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "91f8a17a22ab615a03743120e19935e731f28fb9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "76f2cb4f721815c3b6262a6dc2151de88646924c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "b8dcca427096fc9c50f1b376847fea72bc842d31",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "9abea37942534eeb049335476178696b654b000c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "43403fe45379c64fa6276e5a8ede44493e5d2d3d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
              "lessThan": "29dc2f8e1c97372c2871a70088707933515fbd5b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ac277a01f9017fcde4f3f81670c995992945433",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "093f87dda065e0f618dd577985eccbe85efb9b54",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.8.17",
              "lessThan": "5.9",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.9.2",
              "lessThan": "5.10",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/infiniband/core/cq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.10",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.10",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/29dc2f8e1c97372c2871a70088707933515fbd5b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/43403fe45379c64fa6276e5a8ede44493e5d2d3d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/76f2cb4f721815c3b6262a6dc2151de88646924c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/91f8a17a22ab615a03743120e19935e731f28fb9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9abea37942534eeb049335476178696b654b000c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a804b162f9bc2b38b2ed1b4752eea9faadb1645b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b8dcca427096fc9c50f1b376847fea72bc842d31",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}