CVE-2026-23463 (GCVE-0-2026-23463)
Vulnerability from cvelistv5
Published
2026-04-03 15:15
Modified
2026-04-18 08:59
Severity ?
Summary
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
Version: c535e923bb97a4b361e89a6383693482057f8b0c
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/soc/fsl/qbman/qman.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-18T08:59:12.252Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/66442cf9989bd4489fa80d9f37637d58ab016835"
        },
        {
          "url": "https://git.kernel.org/stable/c/d288fbe652ef43b7128e4bc0c0c2ef6bd03a2210"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e3d47904b8153c8c3ad2f9b66d5008aad677aa8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d21923a8059fa896bfef016f55dd769299335cb4"
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        {
          "url": "https://git.kernel.org/stable/c/751f60bd48edaf03f9d84ab09e5ce6705757d50f"
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        {
          "url": "https://git.kernel.org/stable/c/85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/265e56714635c5dd1e5964bfd97fa6e73f62cde5"
        },
        {
          "url": "https://git.kernel.org/stable/c/014077044e874e270ec480515edbc1cadb976cf2"
        }
      ],
      "title": "soc: fsl: qbman: fix race condition in qman_destroy_fq",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23463",
    "datePublished": "2026-04-03T15:15:42.411Z",
    "dateReserved": "2026-01-13T15:37:46.021Z",
    "dateUpdated": "2026-04-18T08:59:12.252Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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