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CVE-2026-64379

HIGHCVSS 7.1/10EPSS 0.31%

Last modified

CVE-2026-64379 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

EPSS Probability
0.31%

23.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= e2f8fbfb8d09c06decde162090fac3ee220aa280, < 5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < ee2216dbdf0c677e89bb43e03247dba590ed00ef; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < f511807feee7cb29b61bdfa86472c7e9e2e5df94; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < 08c600b7e1818539ba5efee4cdb06215c245ca78; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < c6c484a7d5bff6b929a86d7ed5130f29834c6a0d; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < f80add1bfb3425100a325b14f19648e75669a954; >= e2f8fbfb8d09c06decde162090fac3ee220aa280, < e3d9c7160d483fc8f9e225aafad8ecbbc43f3151
LinuxLinux5.4

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is 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.
How severe is CVE-2026-64379?
CVE-2026-64379 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64379?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST