CVE-2026-74705

Summary

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head, the saved UDP header pointer is no longer valid.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

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < 6a733a38b983d8c2e222f13968209010cf44de87affected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < 19d89b13a43640b2da2f277ee462d919d988cb6faffected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < b3df61bb745eb5201eac22679a2839d4ccbf3442affected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < 1ae134c012e10384cdac420b5cc6e0615cde0b55affected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < 5161e67c561c4f28a5d9335a6e859b02511de92baffected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < 64d322c288577793eedd352b96ef75234ed380feaffected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < 588d4a6795d99d080f74ef0b5f391ea8c453ae5daffected
LinuxLinuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 < d0f86fb36eb260abd10007b62c9dcc1028e03e61affected
LinuxLinux4.6affected
LinuxLinux0 < 4.6unaffected
LinuxLinux5.10.265 <= 5.10.*unaffected
LinuxLinux5.15.216 <= 5.15.*unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References