CVE-2026-43484 : faille moyenne linux linux kernel (CVSS 5.5)

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.

Sévérité

Moyenne (CVSS 5.5)

Vecteur CVSS

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

Exploitation active

Non signalée par la CISA

Publication

13 mai 2026

Dernière mise à jour

26 juin 2026

• linux linux kernel

• Fiche CVE-2026-43484 sur le NVD (NIST)
• git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76…
• git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892d…
• git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a1429…
• git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397…
• git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f…
• git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cf…
• git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60…