CVE-2026-63992: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()
Published Jul 19, 2026
·Updated
In the Linux kernel, the following vulnerability has been resolved:
Affected Software
2 affected componentsFixes available
Linux Linux kernel
debian/linux
6.1.176-16.1.187-16.12.107-16.12.111-17.2.8-17.2.9-1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.187-1Fixed in 6.12.107-1Fixed in 6.12.111-1Fixed in 7.2.8-1Fixed in 7.2.9-1
Event History
Jul 19, 2026
CVE Published
via MITRE·02:56 PM
Data Sourced
via MITRE·02:56 PM
DescriptionSeverity
Data Sourced
via NVD·04:17 PM
DescriptionSeverity
Sep 24, 2026
Data Sourced
via Launchpad·04:09 PM
Description
Oct 4, 2026
Data Sourced
via Debian·04:15 PM
DescriptionAffected Software
Oct 6, 2026
Data Sourced
via Ubuntu·04:16 PM
RemedyDescriptionSeverityAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-63992?
CVE-2026-63992 has a critical severity rating of 9.1.
2
How do I fix CVE-2026-63992?
To fix CVE-2026-63992, update your Linux kernel to the latest patched version that addresses this vulnerability.
3
What type of vulnerability is CVE-2026-63992?
CVE-2026-63992 is an out-of-bounds access vulnerability in the iptunnel_pmtud_check_icmp() function in the Linux kernel.
4
What are the potential impacts of CVE-2026-63992?
CVE-2026-63992 could lead to kernel crashes or other unintended behavior due to out-of-bounds memory access.
5
Which software is affected by CVE-2026-63992?
CVE-2026-63992 affects the Linux kernel.