{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled",
    "id" : "2451191",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451191"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-824",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\nWhen booting with the 'ipv6.disable=1' parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\nBUG: kernel NULL pointer dereference, address: 0000000000000380\nOops: Oops: 0000 [#1] SMP NOPTI\n[...]\nRIP: 0010:neigh_lookup+0x20/0x270\n[...]\nCall Trace:\n<TASK>\nvxlan_xmit+0x638/0x1ef0 [vxlan]\ndev_hard_start_xmit+0x9e/0x2e0\n__dev_queue_xmit+0xbee/0x14e0\npacket_sendmsg+0x116f/0x1930\n__sys_sendto+0x1f5/0x200\n__x64_sys_sendto+0x24/0x30\ndo_syscall_64+0x12f/0x1590\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module.", "A flaw was found in the Linux kernel's Virtual Extensible LAN (VXLAN) module. When IPv6 is disabled, a remote attacker can trigger a system crash by injecting a specially crafted IPv6 packet into the network interface. This vulnerability, a null pointer dereference, can lead to a denial of service." ],
  "statement" : "This flaw affects systems using VXLAN while IPv6 is explicitly disabled via the ipv6.disable=1 boot parameter. When an IPv6 packet reaches the VXLAN interface under these conditions, the uninitialized nd_tbl causes a NULL pointer dereference. This configuration (VXLAN with IPv6 disabled) is uncommon but could be present in specialized network deployments.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23293\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23293\nhttps://lore.kernel.org/linux-cve-announce/2026032525-CVE-2026-23293-b422@gregkh/T" ],
  "name" : "CVE-2026-23293",
  "mitigation" : {
    "value" : "Do not use the ipv6.disable=1 boot parameter on systems using VXLAN, or avoid VXLAN when IPv6 is disabled.",
    "lang" : "en:us"
  },
  "csaw" : false
}