Improper input validation in Linux

CVE-2026-64379

In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-64379: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • Linux — versions 6.6.145, 7.2, e2f8fbfb8d09c06decde162090fac3ee220aa280
  • Linux Kernel — versions 7.2

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-64379?
CVE-2026-64379 is a high-severity vulnerability in Linux, classified under Improper Input Validation. CVSS score: 7.1/10. Published 2026-07-25.
How severe is CVE-2026-64379?
High severity. CVSS v3 base score is 7.1 out of 10.