mmc: core: Avoid bitfield RMW for claim/retune flags
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.1%
exploitation probability
0.1%top 98% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6dhttps://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6ehttps://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957chttps://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc