{"id":"CVE-2026-43484","summary":"mmc: core: Avoid bitfield RMW for claim/retune flags","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: core: Avoid bitfield RMW for claim/retune flags\n\nMove claimed and retune control flags out of the bitfield word to\navoid unrelated RMW side effects in asynchronous contexts.\n\nThe host-\u003eclaimed bit shared a word with retune flags. Writes to claimed\nin __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite\nother bits when concurrent updates happen in other contexts, triggering\nspurious WARN_ON(!host-\u003eclaimed). Convert claimed, can_retune,\nretune_now and retune_paused to bool to remove shared-word coupling.","modified":"2026-05-18T06:00:14.338966170Z","published":"2026-05-13T15:08:30.919Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43484.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43484.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43484"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6c0cedd1ef9527ef13e66875746570e76a3188a7"},{"fixed":"41dce4dae583a8ce06a7ebf4ce704c46a142957c"},{"fixed":"bb7fc2498c3bb25fa6a91f22f4760005325cfbd5"},{"fixed":"270277c2ab631044867adb1bd2f2433d3892de6e"},{"fixed":"45038e03f15e992c48603fff8c6b1c9be5397ac9"},{"fixed":"0e06cc511c61cff1591e5435a207759adcc76b6d"},{"fixed":"d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc"},{"fixed":"901084c51a0a8fb42a3f37d2e9c62083c495f824"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43484.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43484.json"}}],"schema_version":"1.7.5"}