Bug 2379191 (CVE-2025-38310)

Summary:	CVE-2025-38310 kernel: Linux kernel (seg6): Information disclosure or denial of service via improper nexthop address validation
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	Keywords:	Security
Target Milestone:	---
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in the Linux kernel's Segment Routing over IPv6 (seg6) component. This vulnerability allows a local user to trigger the reading of uninitialized memory due to incorrect validation of nexthop address lengths. Successful exploitation could lead to information disclosure or a denial of service.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-07-10 08:02:37 UTC

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

seg6: Fix validation of nexthop addresses

The kernel currently validates that the length of the provided nexthop
address does not exceed the specified length. This can lead to the
kernel reading uninitialized memory if user space provided a shorter
length than the specified one.

Fix by validating that the provided length exactly matches the specified
one.

Comment 1 Avinash Hanwate 2025-07-11 10:18:13 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025071014-CVE-2025-38310-6184@gregkh/T