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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2026-04-03T16:16:00Z",
          "number": "1",
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n\n\nWhen CONFIG_IPV6 is disabled, the udp_sock_create6() function returns 0\n(success) without actually creating a socket. Callers such as\nfou_create() then proceed to dereference the uninitialized socket\npointer, resulting in a NULL pointer dereference.\n\nThe captured NULL deref crash:\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  RIP: 0010:fou_nl_add_doit (net/ipv4/fou_core.c:590 net/ipv4/fou_core.c:764)\n  [...]\n  Call Trace:\n    <TASK>\n    genl_family_rcv_msg_doit.constprop.0 (net/netlink/genetlink.c:1114)\n    genl_rcv_msg (net/netlink/genetlink.c:1194 net/netlink/genetlink.c:1209)\n    [...]\n    netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n    genl_rcv (net/netlink/genetlink.c:1219)\n    netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)\n    netlink_sendmsg (net/netlink/af_netlink.c:1894)\n    __sock_sendmsg (net/socket.c:727 (discriminator 1) net/socket.c:742 (discriminator 1))\n    __sys_sendto (./include/linux/file.h:62 (discriminator 1) ./include/linux/file.h:83 (discriminator 1) net/socket.c:2183 (discriminator 1))\n    __x64_sys_sendto (net/socket.c:2213 (discriminator 1) net/socket.c:2209 (discriminator 1) net/socket.c:2209 (discriminator 1))\n    do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n    entry_SYSCALL_64_after_hwframe (net/arch/x86/entry/entry_64.S:130)\n\nThis patch makes udp_sock_create6 return -EPFNOSUPPORT instead, so\ncallers correctly take their error paths. There is only one caller of\nthe vulnerable function and only privileged users can trigger it.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-23439"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/003343985f26dfefd0c94b1fe1316a2de74428b9",
          "url": "https://git.kernel.org/stable/c/003343985f26dfefd0c94b1fe1316a2de74428b9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/12aa4b73a67d95bc739995a2d6943aec2f9785c9",
          "url": "https://git.kernel.org/stable/c/12aa4b73a67d95bc739995a2d6943aec2f9785c9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/66117dbb3dbae82f86735bf727b1d59cc677afa1",
          "url": "https://git.kernel.org/stable/c/66117dbb3dbae82f86735bf727b1d59cc677afa1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9f036aa0fe46c19e938f03d10e02c23f4fffae5e",
          "url": "https://git.kernel.org/stable/c/9f036aa0fe46c19e938f03d10e02c23f4fffae5e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a05a2149386f6dfb4245f522acdbef892acafc84",
          "url": "https://git.kernel.org/stable/c/a05a2149386f6dfb4245f522acdbef892acafc84"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b3a6df291fecf5f8a308953b65ca72b7fc9e015d",
          "url": "https://git.kernel.org/stable/c/b3a6df291fecf5f8a308953b65ca72b7fc9e015d"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ba7c9ddcdd077942b798979edb035207374d4096",
          "url": "https://git.kernel.org/stable/c/ba7c9ddcdd077942b798979edb035207374d4096"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/dfc96ae0074cc47b5478a59e5aa19233e434243f",
          "url": "https://git.kernel.org/stable/c/dfc96ae0074cc47b5478a59e5aa19233e434243f"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
        }
      ],
      "release_date": "2026-04-03T16:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-25T12:12:22.197117Z",
          "details": "This issue is only reachable on kernels built with CONFIG_IPV6 disabled and when an administrator uses the Foo-over-UDP (fou) Generic Netlink API to create an IPv6 UDP tunnel; that operation carries GENL_ADMIN_PERM, so it requires CAP_NET_ADMIN and cannot be triggered by unprivileged users. The bug is a NULL-pointer dereference leading solely to a local kernel crash (availability impact only), with no confidentiality or integrity risk. Because distribution kernels enable IPv6 by default, the vulnerable path is absent in standard enterprise VM/server builds, making this a low-priority item.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}