CVE-2026-23439

Schwachstellenklasse

In the Linux kernel, the following vulnerability has been resolved: udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n When CONFIG_IPV6 is disabled, the udp_sock_create6() function returns 0 (success) without actually creating a socket. Callers such as fou_create() then proceed to dereference the uninitialized socket pointer, resulting in a NULL pointer dereference. The captured NULL deref crash: BUG: kernel NULL pointer dereference, address: 0000000000000018 RIP: 0010:fou_nl_add_doit (net/ipv4/fou_core.c:590 net/ipv4/fou_core.c:764) [...] Call Trace: <TASK> genl_family_rcv_msg_doit.constprop.0 (net/netlink/genetlink.c:1114) genl_rcv_msg (net/netlink/genetlink.c:1194 net/netlink/genetlink.c:1209) [...] netlink_rcv_skb (net/netlink/af_netlink.c:2550) genl_rcv (net/netlink/genetlink.c:1219) netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) __sock_sendmsg (net/socket.c:727 (discriminator 1) net/socket.c:742 (discriminator 1)) __sys_sendto (./include/linux/file.h:62 (discriminator 1) ./include/linux/file.h:83 (discriminator 1) net/socket.c:2183 (discriminator 1)) __x64_sys_sendto (net/sock

Betroffene Produkte

• linux linux_kernel

Quellen

• https://git.kernel.org/stable/c/003343985f26dfefd0c94b1fe1316a2de74428b9
• https://git.kernel.org/stable/c/12aa4b73a67d95bc739995a2d6943aec2f9785c9
• https://git.kernel.org/stable/c/66117dbb3dbae82f86735bf727b1d59cc677afa1
• https://git.kernel.org/stable/c/9f036aa0fe46c19e938f03d10e02c23f4fffae5e
• https://git.kernel.org/stable/c/a05a2149386f6dfb4245f522acdbef892acafc84
• https://git.kernel.org/stable/c/b3a6df291fecf5f8a308953b65ca72b7fc9e015d