CVE-2026-43484
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.
Does this matter?
Lower severity and a low EPSS score (0.11%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.11% probability · 2th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6dPatch
- https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6ePatch
- https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957cPatch
- https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9Patch
- https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824Patch
- https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5Patch
- https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebcPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.