{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50086","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-06-18T10:57:27.410Z","datePublished":"2025-06-18T11:02:27.283Z","dateUpdated":"2026-05-11T19:12:33.587Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:12:33.587Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don't allow the same type rq_qos add more than once\n\nIn our test of iocost, we encountered some list add/del corruptions of\ninner_walk list in ioc_timer_fn.\n\nThe reason can be described as follows:\n\ncpu 0\t\t\t\t\tcpu 1\nioc_qos_write\t\t\t\tioc_qos_write\n\nioc = q_to_ioc(queue);\nif (!ioc) {\n        ioc = kzalloc();\n\t\t\t\t\tioc = q_to_ioc(queue);\n\t\t\t\t\tif (!ioc) {\n\t\t\t\t\t\tioc = kzalloc();\n\t\t\t\t\t\t...\n\t\t\t\t\t\trq_qos_add(q, rqos);\n\t\t\t\t\t}\n        ...\n        rq_qos_add(q, rqos);\n        ...\n}\n\nWhen the io.cost.qos file is written by two cpus concurrently, rq_qos may\nbe added to one disk twice. In that case, there will be two iocs enabled\nand running on one disk. They own different iocgs on their active list. In\nthe ioc_timer_fn function, because of the iocgs from two iocs have the\nsame root iocg, the root iocg's walk_list may be overwritten by each other\nand this leads to list add/del corruptions in building or destroying the\ninner_walk list.\n\nAnd so far, the blk-rq-qos framework works in case that one instance for\none type rq_qos per queue by default. This patch make this explicit and\nalso fix the crash above."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-iocost.c","block/blk-iolatency.c","block/blk-rq-qos.h","block/blk-wbt.c"],"versions":[{"version":"a79050434b45959f397042080fd1d70ffa9bd9df","lessThan":"0b7f5d7a4d2a72ad9de04ab8ccba2a31904aa638","status":"affected","versionType":"git"},{"version":"a79050434b45959f397042080fd1d70ffa9bd9df","lessThan":"08ef66e800a85afc6b54cb95841f6502627eee2e","status":"affected","versionType":"git"},{"version":"a79050434b45959f397042080fd1d70ffa9bd9df","lessThan":"0c9bb1acd1d103a3070b2126870eb52761d606ce","status":"affected","versionType":"git"},{"version":"a79050434b45959f397042080fd1d70ffa9bd9df","lessThan":"14a6e2eb7df5c7897c15b109cba29ab0c4a791b6","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-iocost.c","block/blk-iolatency.c","block/blk-rq-qos.h","block/blk-wbt.c"],"versions":[{"version":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","status":"unaffected","versionType":"semver"},{"version":"5.15.61","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.18.18","lessThanOrEqual":"5.18.*","status":"unaffected","versionType":"semver"},{"version":"5.19.2","lessThanOrEqual":"5.19.*","status":"unaffected","versionType":"semver"},{"version":"6.0","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":"4.19","versionEndExcluding":"5.15.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.18.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.19.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0b7f5d7a4d2a72ad9de04ab8ccba2a31904aa638"},{"url":"https://git.kernel.org/stable/c/08ef66e800a85afc6b54cb95841f6502627eee2e"},{"url":"https://git.kernel.org/stable/c/0c9bb1acd1d103a3070b2126870eb52761d606ce"},{"url":"https://git.kernel.org/stable/c/14a6e2eb7df5c7897c15b109cba29ab0c4a791b6"}],"title":"block: don't allow the same type rq_qos add more than once","x_generator":{"engine":"bippy-1.2.0"}}}}