CVE-2026-64380
In the Linux kernel, the following vulnerability has been resolved: smb: client: harden POSIX SID length parsing posix_info_sid_size() reads sid[1] to obtain the subauthority count, but its existing boundary check still accepts buffers with only one remaining byte. Require two bytes before reading sid[1] so all client paths that reuse the helper reject truncated POSIX SIDs safely.
- Published Jul 25, 2026
- CVSS 8.2 high
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
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