CVE-2026-99273 is a vulnerability in Linux Kernel
Published on November 7, 2026
ksmbd: reserve space for the UTF-16 terminator in stream info
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: reserve space for the UTF-16 terminator in stream info
smb_strtoUTF16() always writes a terminating zero UTF-16 unit after the
converted characters, but get_file_stream_info() budgets only
sizeof(struct smb2_file_stream_info) + streamlen * 2 for a stream entry
and sizeof(struct smb2_file_stream_info) + 7 * 2 for the trailing
"::$DATA" entry. When an entry exactly fills the 448-byte small response
buffer, the terminator is written two bytes past the allocation.
Reserve one extra UTF-16 unit in both budget checks. The terminator is
not part of the wire format, so the reported lengths are unchanged.
Products Associated with CVE-2026-99273
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 06a751809ebd33e95b05bf733697318a17a4872b is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 0e64f89563164719ceb1aa33f2a8bfd6391fa340 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a025c4991a7d83edc4dd339e3ea86d8ff6226eca is affected.
- Before 6.18.61 is affected.
- Before 7.3.2 is affected.
- Version 6.18.61, <= 6.18.* is unaffected.
- Version 7.3.2, <= 7.3.* is unaffected.
- Version 7.4-rc1, <= * is unaffected.