{"id":"CVE-2026-23463","state":"PUBLISHED","title":"soc: fsl: qbman: fix race condition in qman_destroy_fq","description":"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's a race condition between\nfq_table[fq->idx] state and freeing/allocating from the pool and\nWARN_ON(fq_table[fq->idx]) 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->fqid = fqid;\n                                           fq->idx = fqid * 2;\n                                           WARN_ON(fq_table[fq->idx]);\n                                           fq_table[fq->idx] = fq;\n     fq_table[fq->idx] = NULL;\n\nAnd adding some logs between qman_release_fqid() and\nfq_table[fq->idx] = NULL makes the WARN_ON() trigger a lot more.\n\nTo prevent that, ensure that fq_table[fq->idx] is set to NULL before\ngen_pool_free() is called by using smp_wmb().","publishedAt":"2026-04-03T15:15:42.411Z","updatedAt":"2026-10-15T01:15:23.918Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"66442cf9989bd4489fa80d9f37637d58ab016835","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"d288fbe652ef43b7128e4bc0c0c2ef6bd03a2210","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"9e3d47904b8153c8c3ad2f9b66d5008aad677aa8","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"d21923a8059fa896bfef016f55dd769299335cb4","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"751f60bd48edaf03f9d84ab09e5ce6705757d50f","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"265e56714635c5dd1e5964bfd97fa6e73f62cde5","versionType":"git"},{"version":"c535e923bb97a4b361e89a6383693482057f8b0c","status":"affected","lessThan":"014077044e874e270ec480515edbc1cadb976cf2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/soc/fsl/qbman/qman.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/soc/fsl/qbman/qman.c"]}],"references":["https://git.kernel.org/stable/c/66442cf9989bd4489fa80d9f37637d58ab016835","https://git.kernel.org/stable/c/d288fbe652ef43b7128e4bc0c0c2ef6bd03a2210","https://git.kernel.org/stable/c/9e3d47904b8153c8c3ad2f9b66d5008aad677aa8","https://git.kernel.org/stable/c/d21923a8059fa896bfef016f55dd769299335cb4","https://git.kernel.org/stable/c/751f60bd48edaf03f9d84ab09e5ce6705757d50f","https://git.kernel.org/stable/c/85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa","https://git.kernel.org/stable/c/265e56714635c5dd1e5964bfd97fa6e73f62cde5","https://git.kernel.org/stable/c/014077044e874e270ec480515edbc1cadb976cf2","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23463.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23463","state":"PUBLISHED","datePublished":"2026-04-03T15:15:42.411Z","dateUpdated":"2026-10-15T01:15:23.918Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:46.021Z"},"containers":{"cna":{"title":"soc: fsl: qbman: fix race condition in qman_destroy_fq","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's a race condition between\nfq_table[fq->idx] state and freeing/allocating from the pool and\nWARN_ON(fq_table[fq->idx]) 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->fqid = fqid;\n                                           fq->idx = fqid * 2;\n                                           WARN_ON(fq_table[fq->idx]);\n                                           fq_table[fq->idx] = fq;\n     fq_table[fq->idx] = NULL;\n\nAnd adding some logs between qman_release_fqid() and\nfq_table[fq->idx] = NULL makes the WARN_ON() trigger a lot more.\n\nTo prevent that, ensure that fq_table[fq->idx] is set to NULL before\ngen_pool_free() is called by using 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