Vulnerability in Linux

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4019

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98866CVE-2026-98624CVE-2026-98745+326 more CVEs

[ References ]References

• git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446
• git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9
• git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4
• git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7
• git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027