{ "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" } } ] } }