CVE-2026-43484
mmc: core: Avoid bitfield RMW for claim/retune flags
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 13, 2026 |
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Affected Versions
Linux / Linux
6c0cedd1ef9527ef13e66875746570e76a3188a7 < 41dce4dae583a8ce06a7ebf4ce704c46a142957c 6c0cedd1ef9527ef13e66875746570e76a3188a7 < bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 6c0cedd1ef9527ef13e66875746570e76a3188a7 < 270277c2ab631044867adb1bd2f2433d3892de6e 6c0cedd1ef9527ef13e66875746570e76a3188a7 < 45038e03f15e992c48603fff8c6b1c9be5397ac9 6c0cedd1ef9527ef13e66875746570e76a3188a7 < 0e06cc511c61cff1591e5435a207759adcc76b6d 6c0cedd1ef9527ef13e66875746570e76a3188a7 < d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc 6c0cedd1ef9527ef13e66875746570e76a3188a7 < 901084c51a0a8fb42a3f37d2e9c62083c495f824
Linux / Linux
4.15
References
git.kernel.org: https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c git.kernel.org: https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 git.kernel.org: https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e git.kernel.org: https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9 git.kernel.org: https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d git.kernel.org: https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc git.kernel.org: https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824