Bug 2511932 (CVE-2026-64597) - CVE-2026-64597 kernel: smb: client: fix double-free in SMB2_close() replay
Summary: CVE-2026-64597 kernel: smb: client: fix double-free in SMB2_close() replay
Keywords:
Status: NEW
Alias: CVE-2026-64597
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-06 07:31 UTC by OSIDB Bzimport
Modified: 2026-09-29 12:50 UTC (History)
17 users (show)

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

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:64775 0 None None None 2026-09-08 07:20:00 UTC
Red Hat Product Errata RHSA-2026:66180 0 None None None 2026-09-09 22:04:58 UTC

Description OSIDB Bzimport 2026-08-06 07:31:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix double-free in SMB2_close() replay

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_close_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 gkamathe 2026-08-07 06:42:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026080652-CVE-2026-64597-760b@gregkh/T
Comment 8 errata-xmlrpc 2026-09-08 07:19:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64775 https://access.redhat.com/errata/RHSA-2026:64775
Comment 9 errata-xmlrpc 2026-09-09 22:04:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:66180 https://access.redhat.com/errata/RHSA-2026:66180
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