Bug 2334820 (CVE-2024-56721)

Summary:	CVE-2024-56721 kernel: x86/CPU/AMD: Terminate the erratum_1386_microcode array
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the AMD CPU erratum handling code in the Linux kernel. The erratum_1386_microcode array lacked a proper terminator, which could cause the x86_match_cpu_with_stepping() function to read beyond the end of the array. This results in undefined behavior during CPU feature detection and erratum handling. A local attacker may be able to exploit this flaw to cause a system crash or instability, affecting system availability.	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 2024-12-29 12:02:08 UTC

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

x86/CPU/AMD: Terminate the erratum_1386_microcode array

The erratum_1386_microcode array requires an empty entry at the end.
Otherwise x86_match_cpu_with_stepping() will continue iterate the array after
it ended.

Add an empty entry to erratum_1386_microcode to its end.

Comment 1 Avinash Hanwate 2024-12-30 05:44:04 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122922-CVE-2024-56721-aaac@gregkh/T

Comment 3 errata-xmlrpc 2025-08-11 10:08:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:13598 https://access.redhat.com/errata/RHSA-2025:13598