CVE-2026-99273
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 06a751809ebd33e95b05bf733697318a17a4872b (affected, git) ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 0e64f89563164719ceb1aa33f2a8bfd6391fa340 (affected, git) ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < a025c4991a7d83edc4dd339e3ea86d8ff6226eca (affected, git) ≥ 0; < 6.18.61 (affected, semver) ≥ 0; < 7.3.2 (affected, semver) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
≥ 6.18.61; ≤ 6.18.* (unaffected, semver) ≥ 7.3.2; ≤ 7.3.* (unaffected, semver) ≥ 7.4-rc1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
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