CVE-2026-92509 (GCVE-0-2026-92509)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in counter_release() When accessing a counter via the netlink path the only synchronization mechanism for the said counter is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of counter_release(), which is too late, since by that point vendor-specific resources associated with the counter might already be freed. This can leave a short window where the counter 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 counter is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a counter that is in the process of destruction.
References
Impacted products
Vendor Product Version
Linux Linux Version: 99fa331dc8629be55ac7a0cca0dc56492070ddac
Version: 99fa331dc8629be55ac7a0cca0dc56492070ddac
Version: 99fa331dc8629be55ac7a0cca0dc56492070ddac
Version: 99fa331dc8629be55ac7a0cca0dc56492070ddac
Version: 99fa331dc8629be55ac7a0cca0dc56492070ddac
Version: 99fa331dc8629be55ac7a0cca0dc56492070ddac
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{
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in counter_release()\n\nWhen accessing a counter via the netlink path the only synchronization\nmechanism for the said counter is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\ncounter_release(), which is too late, since by that point\nvendor-specific resources associated with the counter might already be\nfreed. This can leave a short window where the counter remains\naccessible through restrack, leading to a potential use-after-free.\n\nFix this by moving the rdma_restrack_del() call to be before the\nfreeing of the vendor-specific resources, ensuring that the counter is\nremoved from restrack before its internal resources are released.\nThis guarantees that no new users hold references to a counter that is\nin the process of destruction."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:15.303Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5eb0c57a8b568eb08f464861d84d518a2af939ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5cc211e8c39e46f357d30a092d683e84d560de9"
        },
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          "url": "https://git.kernel.org/stable/c/2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c013e3a8d8273da4d47bf1c27f016a3551996f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/64c72390d8407ea86de712a477c796b07d37abc4"
        },
        {
          "url": "https://git.kernel.org/stable/c/235ef2d0e750885c29340b0fc40620a7a4f52e12"
        }
      ],
      "title": "RDMA/core: Fix potential use after free in counter_release()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92509",
    "datePublished": "2026-09-17T16:10:20.100Z",
    "dateReserved": "2026-09-16T12:21:13.872Z",
    "dateUpdated": "2026-10-19T09:04:15.303Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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