by Kastro CVE-2026-74705
Linux Linux — udp: fix potential use-after-free in tunnel segmentation
Description · from the CVE record
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head, the saved UDP header pointer is no longer valid.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
ProductAffectedFixed inSource
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 6a733a38b983d8c2e222f13968209010cf44de876a733a38b983d8c2e222f13968209010cf44de87CNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 19d89b13a43640b2da2f277ee462d919d988cb6f19d89b13a43640b2da2f277ee462d919d988cb6fCNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < b3df61bb745eb5201eac22679a2839d4ccbf3442b3df61bb745eb5201eac22679a2839d4ccbf3442CNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 1ae134c012e10384cdac420b5cc6e0615cde0b551ae134c012e10384cdac420b5cc6e0615cde0b55CNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 5161e67c561c4f28a5d9335a6e859b02511de92b5161e67c561c4f28a5d9335a6e859b02511de92bCNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 64d322c288577793eedd352b96ef75234ed380fe64d322c288577793eedd352b96ef75234ed380feCNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 588d4a6795d99d080f74ef0b5f391ea8c453ae5d588d4a6795d99d080f74ef0b5f391ea8c453ae5dCNA
Linuxdbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < d0f86fb36eb260abd10007b62c9dcc1028e03e61d0f86fb36eb260abd10007b62c9dcc1028e03e61CNA
Linux4.6–CNA
Scores by source
Linux (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total