CVE-2026-43112

In the Linux kernel, the following vulnerability has been resolved:

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

When cifs_sanitize_prepath is called with an empty string or a string

containing only delimiters (e.g., "/"), the current logic attempts to

check *(cursor2 - 1) before cursor2 has advanced. This results in an

out-of-bounds read.

This patch adds an early exit check after stripping prepended

delimiters. If no path content remains, the function returns NULL.

The bug was identified via manual audit and verified using a

standalone test case compiled with AddressSanitizer, which

triggered a SEGV on affected inputs.