What is CVE-2026-43484?

CVE-2026-43484 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 4.15 onward and patched in 5.15.203, 6.1.167, 6.6.130 and others. CVE-2026-43484 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43484?

CVE-2026-43484 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-43484?

Yes, CVE-2026-43484 has been patched. Fixed versions include 5.15.203, 6.1.167, 6.6.130 and others. If you are running Linux kernel 4.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43484 actively exploited?

CVE-2026-43484 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43484

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.

Package Linux Kernel

Published 2026-05-13

Last modified 2026-05-22

Patch available

Yes

Affected versions

Linux kernel versions 4.15 and later are affected. Fixed in 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9, 7.0 and their respective stable series.

Affected from

≥ 4.15

Fixed in

✓ 5.15.203 5.15.x ✓ 6.1.167 6.1.x ✓ 6.6.130 6.6.x ✓ 6.12.78 6.12.x ✓ 6.18.19 6.18.x ✓ 6.19.9 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43484 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e
Patch
Kernel patch commit
https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c
Patch

7 patch commits total View all on NVD

Frequently asked questions

What is CVE-2026-43484?

CVE-2026-43484 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.15 onward and has been patched in 5.15.203, 6.1.167, 6.6.130 and others. CVE-2026-43484 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-43484?

Yes — CVE-2026-43484 has been patched. Fixed versions include 5.15.203, 6.1.167, 6.6.130 and others. If you are running Linux kernel 4.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43484 actively exploited?

No — CVE-2026-43484 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.