CVE-2026-74705

CriticalCVSS 10.0

Published: 22/08/2026(UTC)Updated: 25/08/2026(UTC)Translated: 22/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.18%

7th percentile - higher than 7% of all known CVEs

Summary

In the Linux kernel, __skb_udp_tunnel_segment() has a potential use-after-free vulnerability. It gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer becomes invalid.

Risk Assessment

The vulnerability may lead to use-after-free, potentially resulting in system crash or code execution.

Recommendation

Apply a Linux kernel update that gets the UDP header after the pull to avoid use-after-free.

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.