CVE-2026-98681

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References