{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49901","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-05-01T14:05:17.245Z","datePublished":"2025-05-01T14:10:46.974Z","dateUpdated":"2026-05-11T19:08:54.911Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:08:54.911Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: Fix kmemleak in blk_mq_init_allocated_queue\n\nThere is a kmemleak caused by modprobe null_blk.ko\n\nunreferenced object 0xffff8881acb1f000 (size 1024):\n  comm \"modprobe\", pid 836, jiffies 4294971190 (age 27.068s)\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff 00 53 99 9e ff ff ff ff  .........S......\n  backtrace:\n    [<000000004a10c249>] kmalloc_node_trace+0x22/0x60\n    [<00000000648f7950>] blk_mq_alloc_and_init_hctx+0x289/0x350\n    [<00000000af06de0e>] blk_mq_realloc_hw_ctxs+0x2fe/0x3d0\n    [<00000000e00c1872>] blk_mq_init_allocated_queue+0x48c/0x1440\n    [<00000000d16b4e68>] __blk_mq_alloc_disk+0xc8/0x1c0\n    [<00000000d10c98c3>] 0xffffffffc450d69d\n    [<00000000b9299f48>] 0xffffffffc4538392\n    [<0000000061c39ed6>] do_one_initcall+0xd0/0x4f0\n    [<00000000b389383b>] do_init_module+0x1a4/0x680\n    [<0000000087cf3542>] load_module+0x6249/0x7110\n    [<00000000beba61b8>] __do_sys_finit_module+0x140/0x200\n    [<00000000fdcfff51>] do_syscall_64+0x35/0x80\n    [<000000003c0f1f71>] entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThat is because q->ma_ops is set to NULL before blk_release_queue is\ncalled.\n\nblk_mq_init_queue_data\n  blk_mq_init_allocated_queue\n    blk_mq_realloc_hw_ctxs\n      for (i = 0; i < set->nr_hw_queues; i++) {\n        old_hctx = xa_load(&q->hctx_table, i);\n        if (!blk_mq_alloc_and_init_hctx(.., i, ..))\t\t[1]\n          if (!old_hctx)\n\t    break;\n\n      xa_for_each_start(&q->hctx_table, j, hctx, j)\n        blk_mq_exit_hctx(q, set, hctx, j); \t\t\t[2]\n\n    if (!q->nr_hw_queues)\t\t\t\t\t[3]\n      goto err_hctxs;\n\n  err_exit:\n      q->mq_ops = NULL;\t\t\t  \t\t\t[4]\n\n  blk_put_queue\n    blk_release_queue\n      if (queue_is_mq(q))\t\t\t\t\t[5]\n        blk_mq_release(q);\n\n[1]: blk_mq_alloc_and_init_hctx failed at i != 0.\n[2]: The hctxs allocated by [1] are moved to q->unused_hctx_list and\nwill be cleaned up in blk_mq_release.\n[3]: q->nr_hw_queues is 0.\n[4]: Set q->mq_ops to NULL.\n[5]: queue_is_mq returns false due to [4]. And blk_mq_release\nwill not be called. The hctxs in q->unused_hctx_list are leaked.\n\nTo fix it, call blk_release_queue in exception path."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-mq.c"],"versions":[{"version":"2f8f1336a48bd5186de3476da0a3e2ec06d0533a","lessThan":"2dc97e15a54b7bdf457848aa8c663c98a24e58a6","status":"affected","versionType":"git"},{"version":"2f8f1336a48bd5186de3476da0a3e2ec06d0533a","lessThan":"943f45b9399ed8b2b5190cbc797995edaa97f58f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-mq.c"],"versions":[{"version":"5.2","status":"affected"},{"version":"0","lessThan":"5.2","status":"unaffected","versionType":"semver"},{"version":"6.0.8","lessThanOrEqual":"6.0.*","status":"unaffected","versionType":"semver"},{"version":"6.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.0.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2dc97e15a54b7bdf457848aa8c663c98a24e58a6"},{"url":"https://git.kernel.org/stable/c/943f45b9399ed8b2b5190cbc797995edaa97f58f"}],"title":"blk-mq: Fix kmemleak in blk_mq_init_allocated_queue","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-401","lang":"en","description":"CWE-401 Missing Release of Memory after Effective Lifetime"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-10-01T14:59:17.778258Z","id":"CVE-2022-49901","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-01T20:16:35.594Z"}}]}}