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CVE-2026-63992

kernel: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 26, 2026

Description

A flaw was found in the Linux kernel's tunnels module. This vulnerability occurs when the iptunnel_pmtud_check_icmp() function is called without the skb transport header being properly set. An attacker could exploit this condition to trigger an out-of-bound memory access, which may lead to system instability or a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-805 · Buffer Access with Incorrect Length Value