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CVE-2026-31613 is an out-of-bounds read vulnerability in the Linux kernel SMB client when parsing SMB 3.1.1 symlink error responses returned by a server. The flaw is reachable when an SMB CREATE request receives STATUS_STOPPED_ON_SYMLINK and smb2_check_message() accepts the response without performing length validation, leaving subsequent symlink parsing logic to process untrusted server-controlled data. In symlink_data(), the parser iterates SMB error contexts with an insufficient loop boundary condition and reads context fields even when fewer than the required header bytes remain, allowing a server-controlled ErrorDataLength to move the parsing pointer near the end of the buffer and cause the next iteration to read past it. The parser also reads the symlink header field SymLinkErrorTag from ErrorContextData without first verifying that the symlink header fully fits within bounds. A further bounds-checking error exists in smb2_parse_symlink_response(), which validates the substitute name using a fixed SMB2_SYMLINK_STRUCT_SIZE offset from the start of the response buffer. That offset is only correct when no error contexts are present; when one or more contexts exist, the actual symlink structure is located deeper in the buffer, and each skipped context shifts it further. As a result, substitute-name parsing can run past the end of the I/O vector buffer, and out-of-bounds heap bytes may be UTF-16 decoded into the symlink target returned to userspace via readlink(2).
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A Linux kernel SMB client out-of-bounds read vulnerability when parsing a symlink error response.
A Linux kernel SMB client vulnerability involving out-of-bounds reads while parsing a symlink error response.
A Linux kernel out-of-bounds read vulnerability in the SMB client while parsing symlink error responses.
A Linux kernel SMB client out-of-bounds read vulnerability when parsing a symlink error response.
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Cross-references every affected SKU, including bundled OEM variants.
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