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Review reviewHigh

CVE-2026-64379

Linux

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.

CVSS
7.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.1

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= e2f8fbfb8d09c06decde162090fac3ee220aa280 < 5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < ee2216dbdf0c677e89bb43e03247dba590ed00ef, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < f511807feee7cb29b61bdfa86472c7e9e2e5df94, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < 08c600b7e1818539ba5efee4cdb06215c245ca78, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < c6c484a7d5bff6b929a86d7ed5130f29834c6a0d, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < f80add1bfb3425100a325b14f19648e75669a954, >= e2f8fbfb8d09c06decde162090fac3ee220aa280 < e3d9c7160d483fc8f9e225aafad8ecbbc43f3151, >= 5.4
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE
Not available