{"api_version":"1","generated_at":"2026-05-13T20:37:38+00:00","cve":"CVE-2026-43484","urls":{"html":"https://cve.report/CVE-2026-43484","api":"https://cve.report/api/cve/CVE-2026-43484.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43484","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43484"},"summary":{"title":"mmc: core: Avoid bitfield RMW for claim/retune flags","description":"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->claimed 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->claimed). Convert claimed, can_retune,\nretune_now and retune_paused to bool to remove shared-word coupling.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-13 16:16:51","updated_at":"2026-05-13 16:16:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5","name":"https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc","name":"https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d","name":"https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824","name":"https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e","name":"https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9","name":"https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c","name":"https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43484","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43484","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 41dce4dae583a8ce06a7ebf4ce704c46a142957c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 270277c2ab631044867adb1bd2f2433d3892de6e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 45038e03f15e992c48603fff8c6b1c9be5397ac9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 0e06cc511c61cff1591e5435a207759adcc76b6d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 901084c51a0a8fb42a3f37d2e9c62083c495f824 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.19 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.9 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/linux/mmc/host.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"41dce4dae583a8ce06a7ebf4ce704c46a142957c","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"},{"lessThan":"bb7fc2498c3bb25fa6a91f22f4760005325cfbd5","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"},{"lessThan":"270277c2ab631044867adb1bd2f2433d3892de6e","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"},{"lessThan":"45038e03f15e992c48603fff8c6b1c9be5397ac9","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"},{"lessThan":"0e06cc511c61cff1591e5435a207759adcc76b6d","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"},{"lessThan":"d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"},{"lessThan":"901084c51a0a8fb42a3f37d2e9c62083c495f824","status":"affected","version":"6c0cedd1ef9527ef13e66875746570e76a3188a7","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/linux/mmc/host.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.19","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.9","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"4.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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->claimed 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->claimed). Convert claimed, can_retune,\nretune_now and retune_paused to bool to remove shared-word coupling."}],"providerMetadata":{"dateUpdated":"2026-05-13T15:08:30.919Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c"},{"url":"https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5"},{"url":"https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e"},{"url":"https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9"},{"url":"https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d"},{"url":"https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc"},{"url":"https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824"}],"title":"mmc: core: Avoid bitfield RMW for claim/retune flags","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43484","datePublished":"2026-05-13T15:08:30.919Z","dateReserved":"2026-05-01T14:12:56.012Z","dateUpdated":"2026-05-13T15:08:30.919Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-13 16:16:51","lastModifiedDate":"2026-05-13 16:16:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43484","Ordinal":"1","Title":"mmc: core: Avoid bitfield RMW for claim/retune flags","CVE":"CVE-2026-43484","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43484","Ordinal":"1","NoteData":"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->claimed 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->claimed). Convert claimed, can_retune,\nretune_now and retune_paused to bool to remove shared-word coupling.","Type":"Description","Title":"mmc: core: Avoid bitfield RMW for claim/retune flags"}]}}}