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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < 41dce4dae583a8ce06a7ebf4ce704c46a142957c
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < bb7fc2498c3bb25fa6a91f22f4760005325cfbd5
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < 270277c2ab631044867adb1bd2f2433d3892de6e
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < 45038e03f15e992c48603fff8c6b1c9be5397ac9
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < 0e06cc511c61cff1591e5435a207759adcc76b6d
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc
6c0cedd1ef9527ef13e66875746570e76a3188a7 affected < 901084c51a0a8fb42a3f37d2e9c62083c495f824
Linux Linux affected
Version Status Constraints
4.15 affected —
0 unaffected < 4.15
5.15.203 unaffected ≤ 5.15.*
6.1.167 unaffected ≤ 6.1.*
6.6.130 unaffected ≤ 6.6.*
6.12.78 unaffected ≤ 6.12.*
6.18.19 unaffected ≤ 6.18.*
6.19.9 unaffected ≤ 6.19.*
7.0 unaffected ≤ *

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Workaround

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References
Link Providers
https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d cve-icon
https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e cve-icon
https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c cve-icon
https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9 cve-icon
https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824 cve-icon
https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 cve-icon
https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc cve-icon
History

Wed, 13 May 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title mmc: core: Avoid bitfield RMW for claim/retune flags
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-13T15:08:30.919Z

Reserved: 2026-05-01T14:12:56.012Z

Link: CVE-2026-43484

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.