CVE-2026-64380
⚠️ highSummary
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.
CVSS Score
8.2
High
EPSS Score
0.4
Exploit Probability
Published Date
2026-07-25
First Seen: 2026-07-31
📊 Relative Risk Intelligence
This CVE is High Risk - more severe than 79.4% of all 340,405 vulnerabilities in our database.
#69,974
Top 25% most severe
Severity Percentile
Last Modified
2026-07-27
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H