Bug 2422687 (CVE-2025-68195)

Summary:	CVE-2025-68195 kernel: Linux kernel: Denial of service via out-of-bounds memory access in AMD Zen5 microcode handling
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:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in the Linux kernel's handling of AMD Zen5 microcode. A local attacker could trigger an out-of-bounds memory access by running the `x86_match_min_microcode_rev()` function on a Zen5 CPU, due to a missing terminator in the `zen5_rdseed_microcode`. This vulnerability could lead to system instability or a denial of service (DoS).	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-16 14:03:48 UTC

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

x86/CPU/AMD: Add missing terminator for zen5_rdseed_microcode

Running x86_match_min_microcode_rev() on a Zen5 CPU trips up KASAN for an out
of bounds access.

Comment 1 Alexander B 2025-12-17 02:57:40 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121636-CVE-2025-68195-98fc@gregkh/T