CVE-2026-43484
kernel: mmc: core: Avoid bitfield RMW for claim/retune flags
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 13, 2026
Updated · June 28, 2026
Description
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.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-366 · Race Condition within a Thread