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GHSA-RX24-HF7H-RF8W

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Fix potential use after free in ib_destroy_cq_user()

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_destroy_cq_user(), 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_begin_del() call to the start of ib_destroy_cq_user(), 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.

In addition, this change preserves the intended inverted order between create and destroy routines: resources are added to restrack at the end of successful creation, and hence shall be removed from the restrack first thing during the destruction flow, which keeps the lifecycle management consistent and predictable.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-92511"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:53Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in ib_destroy_cq_user()\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_destroy_cq_user(), 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_begin_del() call to the start of\nib_destroy_cq_user(), ensuring that the CQ is removed from restrack\nbefore its internal resources are released. This guarantees that no new\nusers hold references to a CQ that is in the process of destruction.\n\nIn addition, this change preserves the intended inverted order\nbetween create and destroy routines: resources are added to\nrestrack at the end of successful creation, and hence shall be removed\nfrom the restrack first thing during the destruction flow, which keeps\nthe lifecycle management consistent and predictable.",
  "id": "GHSA-rx24-hf7h-rf8w",
  "modified": "2026-09-17T18:32:07Z",
  "published": "2026-09-17T18:32:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92511"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/197c262dbf94c0f7ab7ac54b66f892ce9f343232"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/253c2ed71a532c70fa0e64317ceb02bb1a50c84c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3481bec4dfc4aee24ffea5a547ee95b70b67d9d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42f7a0c7a94003059540cce448acabfa62ad119d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a72a6aad84b3928dbb5e564bff1f56a7ec222ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b85a148731eceffacb6a030950187d785175607f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-92511 (GCVE-0-2026-92511)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-17 16:10

Title

RDMA/core: Fix potential use after free in ib_destroy_cq_user()

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in ib_destroy_cq_user() 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_destroy_cq_user(), 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_begin_del() call to the start of ib_destroy_cq_user(), 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. In addition, this change preserves the intended inverted order between create and destroy routines: resources are added to restrack at the end of successful creation, and hence shall be removed from the restrack first thing during the destruction flow, which keeps the lifecycle management consistent and predictable.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/42f7a0c7a94003059…
https://git.kernel.org/stable/c/253c2ed71a532c70f…
https://git.kernel.org/stable/c/b85a148731eceffac…
https://git.kernel.org/stable/c/197c262dbf94c0f7a…
https://git.kernel.org/stable/c/8a72a6aad84b3928d…
https://git.kernel.org/stable/c/3481bec4dfc4aee24…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 08f294a1524bc3211a28091daa6c7513828c7d33 , < 42f7a0c7a94003059540cce448acabfa62ad119d (git) Affected: 08f294a1524bc3211a28091daa6c7513828c7d33 , < 253c2ed71a532c70fa0e64317ceb02bb1a50c84c (git) Affected: 08f294a1524bc3211a28091daa6c7513828c7d33 , < b85a148731eceffacb6a030950187d785175607f (git) Affected: 08f294a1524bc3211a28091daa6c7513828c7d33 , < 197c262dbf94c0f7ab7ac54b66f892ce9f343232 (git) Affected: 08f294a1524bc3211a28091daa6c7513828c7d33 , < 8a72a6aad84b3928dbb5e564bff1f56a7ec222ae (git) Affected: 08f294a1524bc3211a28091daa6c7513828c7d33 , < 3481bec4dfc4aee24ffea5a547ee95b70b67d9d5 (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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