CVE-2026-74705

high

Description

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head, the saved UDP header pointer is no longer valid.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.

References

https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61

https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442

https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87

https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe

https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d

https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b

https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55

https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f

Details

Source: Mitre, NVD

Published: 2026-08-22

Updated: 2026-08-22

Risk Information

CVSS v2

Base Score: 9.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:C

Severity: High

CVSS v3

Base Score: 7.1

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

Severity: High