GHSA-CXRG-39G8-V6CJ

Vulnerability from github – Published: 2026-04-03 18:31 – Updated: 2026-04-18 09:30
VLAI?
Details

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

soc: fsl: qbman: fix race condition in qman_destroy_fq

When QMAN_FQ_FLAG_DYNAMIC_FQID is set, there's a race condition between fq_table[fq->idx] state and freeing/allocating from the pool and WARN_ON(fq_table[fq->idx]) in qman_create_fq() gets triggered.

Indeed, we can have: Thread A Thread B qman_destroy_fq() qman_create_fq() qman_release_fqid() qman_shutdown_fq() gen_pool_free() -- At this point, the fqid is available again -- qman_alloc_fqid() -- so, we can get the just-freed fqid in thread B -- fq->fqid = fqid; fq->idx = fqid * 2; WARN_ON(fq_table[fq->idx]); fq_table[fq->idx] = fq; fq_table[fq->idx] = NULL;

And adding some logs between qman_release_fqid() and fq_table[fq->idx] = NULL makes the WARN_ON() trigger a lot more.

To prevent that, ensure that fq_table[fq->idx] is set to NULL before gen_pool_free() is called by using smp_wmb().

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-23463"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-03T16:16:33Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: fsl: qbman: fix race condition in qman_destroy_fq\n\nWhen QMAN_FQ_FLAG_DYNAMIC_FQID is set, there\u0027s a race condition between\nfq_table[fq-\u003eidx] state and freeing/allocating from the pool and\nWARN_ON(fq_table[fq-\u003eidx]) in qman_create_fq() gets triggered.\n\nIndeed, we can have:\n         Thread A                             Thread B\n    qman_destroy_fq()                    qman_create_fq()\n      qman_release_fqid()\n        qman_shutdown_fq()\n        gen_pool_free()\n           -- At this point, the fqid is available again --\n                                           qman_alloc_fqid()\n           -- so, we can get the just-freed fqid in thread B --\n                                           fq-\u003efqid = fqid;\n                                           fq-\u003eidx = fqid * 2;\n                                           WARN_ON(fq_table[fq-\u003eidx]);\n                                           fq_table[fq-\u003eidx] = fq;\n     fq_table[fq-\u003eidx] = NULL;\n\nAnd adding some logs between qman_release_fqid() and\nfq_table[fq-\u003eidx] = NULL makes the WARN_ON() trigger a lot more.\n\nTo prevent that, ensure that fq_table[fq-\u003eidx] is set to NULL before\ngen_pool_free() is called by using smp_wmb().",
  "id": "GHSA-cxrg-39g8-v6cj",
  "modified": "2026-04-18T09:30:19Z",
  "published": "2026-04-03T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23463"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/014077044e874e270ec480515edbc1cadb976cf2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/265e56714635c5dd1e5964bfd97fa6e73f62cde5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66442cf9989bd4489fa80d9f37637d58ab016835"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/751f60bd48edaf03f9d84ab09e5ce6705757d50f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e3d47904b8153c8c3ad2f9b66d5008aad677aa8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d21923a8059fa896bfef016f55dd769299335cb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d288fbe652ef43b7128e4bc0c0c2ef6bd03a2210"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


Log in or create an account to share your comment.




Tags
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.