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Vulnerability

CVE-2026-43484

Reference data from vuln.mlab.sh, coverage from our own index.

CVSS
5.5 Medium
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
0.11%
Risk score
0.9
Published
2026-05-13
Status
Published

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. A flaw was found in the Linux kernel's MultiMediaCard (MMC) core. Concurrent updates to bitfield flags, specifically 'claimed' and 'retune_now', can lead to unintended overwrites of other bits in asynchronous contexts. This can trigger spurious warnings and result in system instability or unexpected behavior.

Weaknesses

CWE-366

Coverage 5

Advisories and references