Security Advisory

CVE-2026-64380

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-25 08:50:30

Last updated 2026-07-25 08:50:30

Assigner Linux

CVSS score not scored

State PUBLISHED

Description

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.

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