{"id":"CVE-2026-23293","state":"PUBLISHED","title":"net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled","description":"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() 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.","publishedAt":"2026-03-25T10:26:51.160Z","updatedAt":"2026-10-15T01:13:47.078Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"649e2bb74da54c96cf20729001e283626a2fefa0","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"b5190fcd75a1f1785c766a8d1e44d3938e168f45","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"5f93e6b4d12bd3a4517a6d447ea675f448f21434","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"f0373e9317bc904e7bdb123d3106fe4f3cea2fb7","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"fbbd2118982c55fb9b0a753ae0cf7194e77149fb","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"abcd48ecdeb2e12eccb8339a35534c757782afcd","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"168ff39e4758897d2eee4756977d036d52884c7e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.12","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.77","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]}],"references":["https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0","https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc","https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45","https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434","https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7","https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb","https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd","https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23293.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23293","state":"PUBLISHED","datePublished":"2026-03-25T10:26:51.160Z","dateUpdated":"2026-10-15T01:13:47.078Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.993Z"},"containers":{"cna":{"title":"net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled","descriptions":[{"lang":"en","value":"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() 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"649e2bb74da54c96cf20729001e283626a2fefa0","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"b5190fcd75a1f1785c766a8d1e44d3938e168f45","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"5f93e6b4d12bd3a4517a6d447ea675f448f21434","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"f0373e9317bc904e7bdb123d3106fe4f3cea2fb7","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"fbbd2118982c55fb9b0a753ae0cf7194e77149fb","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"abcd48ecdeb2e12eccb8339a35534c757782afcd","versionType":"git"},{"version":"e15a00aafa4b7953ad717d3cb1ad7acf4ff76945","status":"affected","lessThan":"168ff39e4758897d2eee4756977d036d52884c7e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.12","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.77","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:04:04.903Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC 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