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Vulnerabilities CVE-2026-64380

CVE-2026-64380

None
Open
TLP:CLEAR

smb: client: harden POSIX SID length parsing

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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.

Details

EPSS Score
0.44%

36.8th percentile

Confidence
90%
Published
Jul 25, 2026
Last Modified
Jul 25, 2026
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