Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION smb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION, that is the whole of struct smb2_fs_control_info, but never assigns FileSystemControlFlags. Those four bytes go to the client as they are found in the response buffer. The buffer is zeroed on allocation, so a standalone request leaks nothing. A compound request can leak: the offset of the next response is advanced by the length pinned for the previous one, so a reply that was written into the buffer and then dropped in favour of the short error response of smb2_set_err_rsp() stays there, and the next reply is laid over it with only the header cleared. ksmbd does not implement quota tracking, so report no control flags.

[ 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-Bund28 Oct 2026WID-SEC-2026-4224

  Linux Kernel: Multiple vulnerabilities allow an unspecified attack Translated from German

  CVE-2026-99116CVE-2026-99143CVE-2026-99170+113 more CVEs

[ References ]References

• git.kernel.org/stable/c/03bb4338c3a7c3fc4decf699a35753f0891aab2a
• git.kernel.org/stable/c/370459776468fc68c97008360108f381e3120953
• git.kernel.org/stable/c/995456b5e703e128904a6cbc8b3347eb3d04c72c
• git.kernel.org/stable/c/c0cd3fc6824122014da2b3b0cb7ddeaa2946ec8e
• git.kernel.org/stable/c/c78aea8984c84767e87f677477e4784deb8adfde
• git.kernel.org/stable/c/d8c450ad0d08980b39b08d435efa921086c8b227
• git.kernel.org/stable/c/e8b82184a1982894820a91a72ac9857ddd5dffbf