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udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n

Type: advisorySource: Official CVE List1 source record

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: 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/socket.c:2213 (discriminator 1) net/socket.c:2209 (discriminator 1) net/socket.c:2209 (discriminator 1)) do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) entry_SYSCALL_64_after_hwframe (net/arch/x86/entry/entry_64.S:130) This patch makes udp_sock

Announced Source revision 1
Original source ↗

CVE-2026-23439

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23439

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "dfc96ae0074cc47b5478a59e5aa19233e434243f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "66117dbb3dbae82f86735bf727b1d59cc677afa1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "ba7c9ddcdd077942b798979edb035207374d4096",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "a05a2149386f6dfb4245f522acdbef892acafc84",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "9f036aa0fe46c19e938f03d10e02c23f4fffae5e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "003343985f26dfefd0c94b1fe1316a2de74428b9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "12aa4b73a67d95bc739995a2d6943aec2f9785c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd384412e199b62c3ddaabd18dce86d0e164c5b9",
        "lessThan": "b3a6df291fecf5f8a308953b65ca72b7fc9e015d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/udp_tunnel.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.20",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/udp_tunnel.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23439

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27253 · Revision 1
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Publisher date
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