CVE-2026-80844

CVE Details

Release Date:	2026-09-04
Impact:	Important	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can carry an arbitrary segments_left value. With segments_left equal to 255, the function moves its address pointer 4,064 bytes backwards and passes a 4,064-byte length to memmove(), resulting in an out-of-bounds access. Validate the invariant locally before modifying the routing header or performing any address-pointer arithmetic, and propagate malformed-header errors to the existing AH6 input and output error paths.

See more information about CVE-2026-80844 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (kernel-uek)	ELSA-2026-500328	2026-09-17
Oracle Linux version 7 (kernel-uek)	ELSA-2026-500330	2026-09-17
Oracle Linux version 8 (kernel-uek)	ELSA-2026-500329	2026-09-17
Oracle Linux version 8 (kernel-uek)	ELSA-2026-500330	2026-09-17
Oracle Linux version 9 (kernel-uek)	ELSA-2026-500328	2026-09-17
Oracle Linux version 9 (kernel-uek)	ELSA-2026-500329	2026-09-17