CVE-2026-43484

MediumCVSS 5.5/10Last modified Nov 6, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < 41dce4dae583a8ce06a7ebf4ce704c46a142957c; >= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < bb7fc2498c3bb25fa6a91f22f4760005325cfbd5; >= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < 270277c2ab631044867adb1bd2f2433d3892de6e; >= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < 45038e03f15e992c48603fff8c6b1c9be5397ac9; >= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < 0e06cc511c61cff1591e5435a207759adcc76b6d; >= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc; >= 6c0cedd1ef9527ef13e66875746570e76a3188a7, < 901084c51a0a8fb42a3f37d2e9c62083c495f824
LinuxLinux4.15

References

Timeline

Published
May 13, 2026
Last modified
Nov 6, 2026
NVD status
Analyzed

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CVE-2026-43484: Medium severity, CVSS 5.5 | Vulnix