Bug 2468142 (CVE-2026-43384)

Summary:	CVE-2026-43384 kernel: net/tcp-ao: Fix MAC comparison to be constant-time
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
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 TCP Authentication Option (TCP-AO) implementation. This vulnerability arises from a non-constant-time comparison of Message Authentication Codes (MACs). A remote attacker could potentially exploit this timing discrepancy to perform a timing attack, which may lead to the disclosure of sensitive information.	Story Points:	---
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Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-08 15:01:20 UTC

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

net/tcp-ao: Fix MAC comparison to be constant-time

To prevent timing attacks, MACs need to be compared in constant
time.  Use the appropriate helper function for this.

Comment 1 Keith Grant 2026-05-08 21:24:41 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050834-CVE-2026-43384-d8ea@gregkh/T