CVE-2026-98681: vulnerability in Linux
smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
Published · Updated
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
The invalidHandle, swapfile, oplock_break_cancelled, offload,
and status_file_deleted fields are stored in the same bitfield byte
in struct cifsFileInfo, but are updated in different code paths that
may run simultaneously, and are protected by different locks. Since
bitfield assignments generate byte-level read-modify-write operations,
a modification to one flag can overwrite a concurrent modification to
another flag.
To avoid these races, convert these flags from a bitfield to
separate bool fields.
Affected products
Linux · LinuxRelated CVEs — Linux
In the same product, most dangerous first.
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References
https://git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446https://git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9https://git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4https://git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7https://git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027