CVE-2026-43484
mmc: core: Avoid bitfield RMW for claim/retune flags
In the Linux kernel, the following vulnerability has been resolved: mmc: core: Avoid bitfield RMW for claim/retune flags Move claimed and retune control flags out of the bitfield word to avoid unrelated RMW side effects in asynchronous contexts. The host->claimed bit shared a word with retune flags. Writes to claimed in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARN_ON(!host->claimed). Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < 41dce4dae583a8ce06a7ebf4ce704c46a142957c (affected, git) ≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 (affected, git) ≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < 270277c2ab631044867adb1bd2f2433d3892de6e (affected, git) ≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < 45038e03f15e992c48603fff8c6b1c9be5397ac9 (affected, git) ≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < 0e06cc511c61cff1591e5435a207759adcc76b6d (affected, git) ≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc (affected, git) ≥ 6c0cedd1ef9527ef13e66875746570e76a3188a7; < 901084c51a0a8fb42a3f37d2e9c62083c495f824 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.15 (affected) ≥ 0; < 4.15 (unaffected, semver) ≥ 5.15.203; ≤ 5.15.* (unaffected, semver) ≥ 6.1.167; ≤ 6.1.* (unaffected, semver) ≥ 6.6.130; ≤ 6.6.* (unaffected, semver) ≥ 6.12.78; ≤ 6.12.* (unaffected, semver) ≥ 6.18.19; ≤ 6.18.* (unaffected, semver) ≥ 6.19.9; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957cCNA: Linux
- https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5CNA: Linux
- https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6eCNA: Linux
- https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9CNA: Linux
- https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6dCNA: Linux
- https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebcCNA: Linux
- https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824CNA: Linux
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