Bug 2467156 (CVE-2026-43206)

Summary:	CVE-2026-43206 kernel: drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()
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:	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 drm/amdkfd component. An unprivileged local user can exploit an out-of-bounds write vulnerability in the kfd_event_page_set() function. This occurs because the function writes data without properly validating the buffer size, allowing a small buffer to trigger a write beyond its allocated memory. Successful exploitation of this flaw could lead to potential privilege escalation.	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 2026-05-06 13:07:36 UTC

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

drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()

The kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8
bytes via memset without checking the buffer size parameter. This allows
unprivileged userspace to trigger an out-of bounds kernel memory write
by passing a small buffer, leading to  potential privilege
escalation.

Comment 1 Keith Grant 2026-05-06 21:29:17 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050647-CVE-2026-43206-ca61@gregkh/T

Comment 6 errata-xmlrpc 2026-08-17 15:30:01 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55765 https://access.redhat.com/errata/RHSA-2026:55765

Comment 7 errata-xmlrpc 2026-08-17 16:51:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55764 https://access.redhat.com/errata/RHSA-2026:55764

Comment 8 errata-xmlrpc 2026-08-20 05:13:27 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 9 errata-xmlrpc 2026-08-20 05:22:16 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