{"id":"CVE-2022-49902","state":"PUBLISHED","title":"block: Fix possible memory leak for rq_wb on add_disk failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix possible memory leak for rq_wb on add_disk failure\n\nkmemleak reported memory leaks in device_add_disk():\n\nkmemleak: 3 new suspected memory leaks\n\nunreferenced object 0xffff88800f420800 (size 512):\n  comm \"modprobe\", pid 4275, jiffies 4295639067 (age 223.512s)\n  hex dump (first 32 bytes):\n    04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00  ................\n    00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [<00000000d3662699>] kmalloc_trace+0x26/0x60\n    [<00000000edc7aadc>] wbt_init+0x50/0x6f0\n    [<0000000069601d16>] wbt_enable_default+0x157/0x1c0\n    [<0000000028fc393f>] blk_register_queue+0x2a4/0x420\n    [<000000007345a042>] device_add_disk+0x6fd/0xe40\n    [<0000000060e6aab0>] nbd_dev_add+0x828/0xbf0 [nbd]\n    ...\n\nIt is because the memory allocated in wbt_enable_default() is not\nreleased in device_add_disk() error path.\nNormally, these memory are freed in:\n\ndel_gendisk()\n  rq_qos_exit()\n    rqos->ops->exit(rqos);\n      wbt_exit()\n\nSo rq_qos_exit() is called to free the rq_wb memory for wbt_init().\nHowever in the error path of device_add_disk(), only\nblk_unregister_queue() is called and make rq_wb memory leaked.\n\nAdd rq_qos_exit() to the error path to fix it.","publishedAt":"2025-05-01T14:10:47.608Z","updatedAt":"2026-05-11T19:08:56.015Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"83cbce9574462c6b4eed6797bdaf18fae6859ab3","status":"affected","lessThan":"4e68c5da60cd79950bd56287ae80b39d6261f995","versionType":"git"},{"version":"83cbce9574462c6b4eed6797bdaf18fae6859ab3","status":"affected","lessThan":"528677d3b4af985445bd4ac667485ded1ed11220","versionType":"git"},{"version":"83cbce9574462c6b4eed6797bdaf18fae6859ab3","status":"affected","lessThan":"fa81cbafbf5764ad5053512152345fab37a1fe18","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.78","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.8","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]}],"references":["https://git.kernel.org/stable/c/4e68c5da60cd79950bd56287ae80b39d6261f995","https://git.kernel.org/stable/c/528677d3b4af985445bd4ac667485ded1ed11220","https://git.kernel.org/stable/c/fa81cbafbf5764ad5053512152345fab37a1fe18"],"weaknesses":["CWE-401"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49902.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49902","state":"PUBLISHED","datePublished":"2025-05-01T14:10:47.608Z","dateUpdated":"2026-05-11T19:08:56.015Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-05-01T14:05:17.245Z"},"containers":{"cna":{"title":"block: Fix possible memory leak for rq_wb on add_disk failure","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix possible memory leak for rq_wb on add_disk failure\n\nkmemleak reported memory leaks in device_add_disk():\n\nkmemleak: 3 new suspected memory leaks\n\nunreferenced object 0xffff88800f420800 (size 512):\n  comm \"modprobe\", pid 4275, jiffies 4295639067 (age 223.512s)\n  hex dump (first 32 bytes):\n    04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00  ................\n    00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [<00000000d3662699>] kmalloc_trace+0x26/0x60\n    [<00000000edc7aadc>] wbt_init+0x50/0x6f0\n    [<0000000069601d16>] wbt_enable_default+0x157/0x1c0\n    [<0000000028fc393f>] blk_register_queue+0x2a4/0x420\n    [<000000007345a042>] device_add_disk+0x6fd/0xe40\n    [<0000000060e6aab0>] nbd_dev_add+0x828/0xbf0 [nbd]\n    ...\n\nIt is because the memory allocated in wbt_enable_default() is not\nreleased in device_add_disk() error path.\nNormally, these memory are freed in:\n\ndel_gendisk()\n  rq_qos_exit()\n    rqos->ops->exit(rqos);\n      wbt_exit()\n\nSo rq_qos_exit() is called to free the rq_wb memory for wbt_init().\nHowever in the error path of device_add_disk(), only\nblk_unregister_queue() is called and make rq_wb memory leaked.\n\nAdd rq_qos_exit() to the error path to fix it."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"83cbce9574462c6b4eed6797bdaf18fae6859ab3","status":"affected","lessThan":"4e68c5da60cd79950bd56287ae80b39d6261f995","versionType":"git"},{"version":"83cbce9574462c6b4eed6797bdaf18fae6859ab3","status":"affected","lessThan":"528677d3b4af985445bd4ac667485ded1ed11220","versionType":"git"},{"version":"83cbce9574462c6b4eed6797bdaf18fae6859ab3","status":"affected","lessThan":"fa81cbafbf5764ad5053512152345fab37a1fe18","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.78","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.0.8","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4e68c5da60cd79950bd56287ae80b39d6261f995"},{"url":"https://git.kernel.org/stable/c/528677d3b4af985445bd4ac667485ded1ed11220"},{"url":"https://git.kernel.org/stable/c/fa81cbafbf5764ad5053512152345fab37a1fe18"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:08:56.015Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.0.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","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":"2025-10-01T14:59:03.595609Z","id":"CVE-2022-49902","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-401","type":"CWE","lang":"en","description":"CWE-401 Missing Release of Memory after Effective Lifetime"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T14:59:06.935Z"}}]}}}