CVE-2026-43484: mmc: core: Avoid bitfield RMW for claim/retune flags
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 mmcclaimhost() or retunenow in mmcmqqueuerq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARNON(!host->claimed). Convert claimed, canretune, retunenow and retunepaused to bool to remove shared-word coupling.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-43484?
CVE-2026-43484 has been classified as a medium severity vulnerability due to potential impacts on security and stability.
How do I fix CVE-2026-43484?
To resolve CVE-2026-43484, update to the latest version of the Linux kernel that includes the patch for this vulnerability.
What systems are affected by CVE-2026-43484?
CVE-2026-43484 affects the Linux kernel across various distributions.
What type of vulnerability is CVE-2026-43484?
CVE-2026-43484 is a race condition vulnerability related to bitfield read-modify-write operations.
Can CVE-2026-43484 be exploited remotely?
Yes, CVE-2026-43484 can potentially be exploited remotely under certain conditions.