{"id":"CVE-2026-23293","title":"net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled","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":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < 649e2bb74da54c96cf20729001e283626a2fefa0","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < b5190fcd75a1f1785c766a8d1e44d3938e168f45","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < 5f93e6b4d12bd3a4517a6d447ea675f448f21434","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < f0373e9317bc904e7bdb123d3106fe4f3cea2fb7","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < fbbd2118982c55fb9b0a753ae0cf7194e77149fb","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < abcd48ecdeb2e12eccb8339a35534c757782afcd","Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < 168ff39e4758897d2eee4756977d036d52884c7e","Linux 3.12"],"published":"2026-03-25","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:45:25.692Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23293","references":[{"url":"https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0"},{"url":"https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc"},{"url":"https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45"},{"url":"https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434"},{"url":"https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7"},{"url":"https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb"},{"url":"https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd"},{"url":"https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02878,"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 >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < 649e2bb74da54c96cf20729001e283626a2fefa0`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < b5190fcd75a1f1785c766a8d1e44d3938e168f45`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < 5f93e6b4d12bd3a4517a6d447ea675f448f21434`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < f0373e9317bc904e7bdb123d3106fe4f3cea2fb7`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < fbbd2118982c55fb9b0a753ae0cf7194e77149fb`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < abcd48ecdeb2e12eccb8339a35534c757782afcd`\n- `Linux >= e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 < 168ff39e4758897d2eee4756977d036d52884c7e`\n- `Linux 3.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}