Bug 2507046 (CVE-2026-64387) - CVE-2026-64387 kernel: smb: client: fix query directory replay double-free
Summary: CVE-2026-64387 kernel: smb: client: fix query directory replay double-free
Keywords:
Status: NEW
Alias: CVE-2026-64387
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-25 10:02 UTC by OSIDB Bzimport
Modified: 2026-09-04 01:03 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-2026:63128 0 None None None 2026-09-04 01:03:04 UTC
Red Hat Product Errata RHSA-2026:63129 0 None None None 2026-09-04 00:53:04 UTC

Description OSIDB Bzimport 2026-07-25 10:02:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix query directory replay double-free

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_query_directory_init() fails before the next send,
cleanup retains the previous buffer type and frees that response again.

Reset response bookkeeping before each attempt to prevent the stale free.
Comment 1 Mauro Matteo Cascella 2026-07-29 08:16:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072526-CVE-2026-64387-ff1a@gregkh/T
Comment 5 errata-xmlrpc 2026-09-04 00:53:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:63129 https://access.redhat.com/errata/RHSA-2026:63129
Comment 6 errata-xmlrpc 2026-09-04 01:03:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:63128 https://access.redhat.com/errata/RHSA-2026:63128
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