Linux Kernel UDP Tunnel Use-After-<Address> in skb_udp_tunnel_segment
CVE-2026-74705 Published on August 22, 2026
udp: fix potential use-after-free in tunnel segmentation
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the saved UDP header pointer is no longer valid.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.
Products Associated with CVE-2026-74705
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Affected Versions
Linux:- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below 6a733a38b983d8c2e222f13968209010cf44de87 is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below 19d89b13a43640b2da2f277ee462d919d988cb6f is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below b3df61bb745eb5201eac22679a2839d4ccbf3442 is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below 1ae134c012e10384cdac420b5cc6e0615cde0b55 is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below 5161e67c561c4f28a5d9335a6e859b02511de92b is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below 64d322c288577793eedd352b96ef75234ed380fe is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below 588d4a6795d99d080f74ef0b5f391ea8c453ae5d is affected.
- Version dbef491ebe7f3a4fb1b9111878b86a426fd540b7 and below d0f86fb36eb260abd10007b62c9dcc1028e03e61 is affected.
- Version 4.6 is affected.
- Before 4.6 is unaffected.
- Version 5.10.265, <= 5.10.* is unaffected.
- Version 5.15.216, <= 5.15.* is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.152, <= 6.6.* is unaffected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.