CVE-2026-74705critical

udp: fix potential use-after-free in tunnel segmentation

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 10epss 0.5%

exploitation probability

0.5%top 58% of all CVEs

observed exploitation

nono source reports it

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head, the saved UDP header pointer is no longer valid.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

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

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55 https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87 https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442 https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61