Bug 2507042 (CVE-2026-64382)

Summary:	CVE-2026-64382 kernel: smb: client: fix double-free in SMB2_open() replay
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	kgrant, rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Server Message Block (SMB) client. A double-free vulnerability exists in the `SMB2_open()` replay mechanism. This occurs when a response-bearing attempt returns a replayable error and frees its response buffer, and then the cleanup process attempts to free the same buffer again. This memory corruption vulnerability could potentially lead to a denial of service or, in some cases, arbitrary code execution.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-25 10:01:58 UTC

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix double-free in SMB2_open() replay

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_open_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 2026-07-28 16:43:07 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072525-CVE-2026-64382-5957@gregkh/T

Comment 5 errata-xmlrpc 2026-08-20 05:13:31 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 6 errata-xmlrpc 2026-08-20 05:22:34 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

Comment 7 Jon Orris 2026-09-16 00:55:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:67720 https://access.redhat.com/errata/RHSA-2026:67720

Comment 8 Jon Orris 2026-09-21 00:56:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:69089 https://access.redhat.com/errata/RHSA-2026:69089