Out-of-bounds read in Linux kernel - CVE-2026-80976
Published: September 12, 2026
Vulnerability identifier: #VU149424
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80976
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause an out-of-bounds read.
The vulnerability exists due to stale IPv6 control block state in the decap_and_validate() function of the seg6 local processing component when processing a decapsulated IPv6 packet through an End.DX6 or End.DT6 route. A local user can install a local SID and inject a crafted outer IPv6 packet to cause an out-of-bounds read.
The outer packet contains Hop-by-Hop and Destination Options headers followed by an SRH and a minimal inner IPv6 packet.
Affected software
Linux kernel
How to mitigate CVE-2026-80976
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3