mmc: core: Avoid bitfield RMW for claim/retune flags
Summary
| CVE | CVE-2026-43484 |
|---|
| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
|---|
| Published | 2026-05-13 16:16:51 UTC |
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| Updated | 2026-05-13 16:16:51 UTC |
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| 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. |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 41dce4dae583a8ce06a7ebf4ce704c46a142957c git |
Not specified |
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 git |
Not specified |
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 270277c2ab631044867adb1bd2f2433d3892de6e git |
Not specified |
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 45038e03f15e992c48603fff8c6b1c9be5397ac9 git |
Not specified |
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 0e06cc511c61cff1591e5435a207759adcc76b6d git |
Not specified |
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc git |
Not specified |
| CNA |
Linux |
Linux |
affected 6c0cedd1ef9527ef13e66875746570e76a3188a7 901084c51a0a8fb42a3f37d2e9c62083c495f824 git |
Not specified |
| CNA |
Linux |
Linux |
affected 4.15 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 4.15 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.203 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.167 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.130 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.78 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.19 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.19.9 6.19.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.0 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.
