CVE-2026-64379 Details
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.
A vulnerability in the Linux kernel's SMB client implementation has been addressed. When the 'modefromsid' feature is active, the 'parse_dacl()' function incorrectly applies the server-provided sub_auth[2] value from the NFS mode SID to the cf_mode attribute without masking it to 07777. This oversight could lead to improper permission handling. The vulnerability has been fixed by ensuring the correct masking is applied, aligning with the read path behavior.
Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/08c600b7e1818539ba5efee4cdb06215c245ca78 | kernel.org | Patch |
| https://git.kernel.org/stable/c/5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d | kernel.org | Patch |
| https://git.kernel.org/stable/c/c6c484a7d5bff6b929a86d7ed5130f29834c6a0d | kernel.org | Patch |
| https://git.kernel.org/stable/c/e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ee2216dbdf0c677e89bb43e03247dba590ed00ef | kernel.org | Patch |
| https://git.kernel.org/stable/c/f511807feee7cb29b61bdfa86472c7e9e2e5df94 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f80add1bfb3425100a325b14f19648e75669a954 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.4, < 5.10.261 >= 5.11, < 5.15.212 >= 5.16, < 6.1.178 >= 6.2, < 6.6.145 >= 6.7, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 7.2 rc1 7.2 rc2 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 8, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 27, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |