Bug 2507135 (CVE-2026-64379) - CVE-2026-64379 kernel: smb: client: mask server-provided mode to 07777 in modefromsid
Summary: CVE-2026-64379 kernel: smb: client: mask server-provided mode to 07777 in mod...
Keywords:
Status: NEW
Alias: CVE-2026-64379
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-25 10:06 UTC by OSIDB Bzimport
Modified: 2026-08-20 05:22 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:57251 0 None None None 2026-08-20 05:22:36 UTC
Red Hat Product Errata RHSA-2026:57252 0 None None None 2026-08-20 05:13:34 UTC
Red Hat Product Errata RHSA-2026:57253 0 None None None 2026-08-20 04:24:36 UTC
Red Hat Product Errata RHSA-2026:57254 0 None None None 2026-08-20 03:42:28 UTC

Description OSIDB Bzimport 2026-07-25 10:06:52 UTC 
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.
Comment 1 TEJ RATHI 2026-07-29 15:12:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072525-CVE-2026-64379-242b@gregkh/T
Comment 4 errata-xmlrpc 2026-08-20 03:42:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:57254 https://access.redhat.com/errata/RHSA-2026:57254
Comment 5 errata-xmlrpc 2026-08-20 04:24:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:57253 https://access.redhat.com/errata/RHSA-2026:57253
Comment 6 errata-xmlrpc 2026-08-20 05:13:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:57252 https://access.redhat.com/errata/RHSA-2026:57252
Comment 7 errata-xmlrpc 2026-08-20 05:22:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:57251 https://access.redhat.com/errata/RHSA-2026:57251
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