{"id":"CVE-2026-23293","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the 'ipv6.disable=1' parameter, the nd_tbl is never\ninitialized because inet6_init() ex…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the 'ipv6.disable=1' parameter, the nd_tbl is never\ninitialized because inet6_init() ex…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.12, < 5.10.253","linux_kernel >= 5.11, < 5.15.203","linux_kernel >= 5.16, < 6.1.167","linux_kernel >= 6.2, < 6.6.130","linux_kernel >= 6.7, < 6.12.77","linux_kernel >= 6.13, < 6.18.17","linux_kernel >= 6.19, < 6.19.7","linux_kernel = 7.0"],"patched":["linux_kernel 6.19.7"],"published":"2026-03-25","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:47.777","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-23293","references":[{"url":"https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00134,"epssPercentile":0.02868,"ingestedAt":"2026-09-08T15:33:26.993Z","slug":"CVE-2026-23293","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\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().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n  <TASK>\n  vxlan_xmit+0x638/0x1ef0 [vxlan]\n  dev_hard_start_xmit+0x9e/0x2e0\n  __dev_queue_xmit+0xbee/0x14e0\n  packet_sendmsg+0x116f/0x1930\n  __sys_sendto+0x1f5/0x200\n  __x64_sys_sendto+0x24/0x30\n  do_syscall_64+0x12f/0x1590\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\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.\n\n## Affected\n\n- `linux_kernel >= 3.12, < 5.10.253`\n- `linux_kernel >= 5.11, < 5.15.203`\n- `linux_kernel >= 5.16, < 6.1.167`\n- `linux_kernel >= 6.2, < 6.6.130`\n- `linux_kernel >= 6.7, < 6.12.77`\n- `linux_kernel >= 6.13, < 6.18.17`\n- `linux_kernel >= 6.19, < 6.19.7`\n- `linux_kernel = 7.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.7`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221651,"id":"CVE-2026-23293","ts":1792035304849,"field":"cvss","old":null,"new":"5.5"},{"seq":221650,"id":"CVE-2026-23293","ts":1792035304849,"field":"severity","old":"none","new":"medium"}]}