CVEvulnerability
CVE-2026-98681
- Status
- Received
- Published
- 2026-10-18
- Last modified
- 2026-10-21
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Description
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.
References
- https://git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446 git.kernel.org
- https://git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9 git.kernel.org
- https://git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4 git.kernel.org
- https://git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7 git.kernel.org
- https://git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027 git.kernel.org