{"id":"CVE-2026-98379","state":"PUBLISHED","title":"netfilter: ip6t_rpfilter: reject routes without inet6_dev","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rpfilter: reject routes without inet6_dev\n\nip6_route_lookup() can return an error-free route whose rt6i_idev is\nNULL. Lowering an external nexthop device's MTU below IPV6_MIN_MTU tears\ndown its inet6_dev while fib6_ifdown() leaves routes using nexthop objects\nin the FIB. An unprivileged user can construct this state with rtnetlink\nin a private user and network namespace, then trigger a NULL dereference\nthrough an IPv6 rpfilter lookup:\n\n  Oops: general protection fault, probably for non-canonical address\n  0xdffffc0000000000\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  RIP: rpfilter_mt (net/ipv6/netfilter/ip6t_rpfilter.c:75)\n  Call Trace:\n  ip6t_do_table (net/ipv6/netfilter/ip6_tables.c:316)\n  nf_hook_slow (net/netfilter/core.c:619)\n  ipv6_rcv (net/ipv6/ip6_input.c:351)\n  __netif_receive_skb_one_core (net/core/dev.c:6216)\n  process_backlog (net/core/dev.c:6680)\n  __napi_poll (net/core/dev.c:7739)\n  net_rx_action (net/core/dev.c:7959)\n  handle_softirqs (kernel/softirq.c:622)\n  do_softirq.part.0 (kernel/softirq.c:523)\n  __local_bh_enable_ip (kernel/softirq.c:450)\n  __dev_queue_xmit (net/core/dev.c:4913)\n  packet_sendmsg (net/packet/af_packet.c:3139)\n  __sys_sendto (net/socket.c:2252)\n  __x64_sys_sendto (net/socket.c:2259)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nReject routes without an inet6_dev immediately after lookup. Such routes\nare not eligible for reverse-path filtering, and the check protects all\nlater rt6i_idev dereferences.","publishedAt":"2026-10-09T07:34:19.425Z","updatedAt":"2026-10-19T09:18:30.044Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"f4de78756b0fddbd125b2b1b77c74f2eccc8e977","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"1681ab6dd1271f2f36047490793b78b1848bbcc9","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"65487e9e99431ffcf05024a817f51ee4e3bd9b47","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"f49da48bd679cfee646d6a40dd02b1933de577d1","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"eafe081ea77d25b5c8e601680671b4ecb4520e7d","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"3a7384bc2e66217c9a01a392281334f4423740a0","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"1b9b5323725e458906c7620a3bc10398b51ad954","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/netfilter/ip6t_rpfilter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/netfilter/ip6t_rpfilter.c"]}],"references":["https://git.kernel.org/stable/c/f4de78756b0fddbd125b2b1b77c74f2eccc8e977","https://git.kernel.org/stable/c/1681ab6dd1271f2f36047490793b78b1848bbcc9","https://git.kernel.org/stable/c/65487e9e99431ffcf05024a817f51ee4e3bd9b47","https://git.kernel.org/stable/c/f49da48bd679cfee646d6a40dd02b1933de577d1","https://git.kernel.org/stable/c/290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40","https://git.kernel.org/stable/c/eafe081ea77d25b5c8e601680671b4ecb4520e7d","https://git.kernel.org/stable/c/3a7384bc2e66217c9a01a392281334f4423740a0","https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98379.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98379","state":"PUBLISHED","datePublished":"2026-10-09T07:34:19.425Z","dateUpdated":"2026-10-19T09:18:30.044Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.345Z"},"containers":{"cna":{"title":"netfilter: ip6t_rpfilter: reject routes without inet6_dev","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rpfilter: reject routes without inet6_dev\n\nip6_route_lookup() can return an error-free route whose rt6i_idev is\nNULL. Lowering an external nexthop device's MTU below IPV6_MIN_MTU tears\ndown its inet6_dev while fib6_ifdown() leaves routes using nexthop objects\nin the FIB. An unprivileged user can construct this state with rtnetlink\nin a private user and network namespace, then trigger a NULL dereference\nthrough an IPv6 rpfilter lookup:\n\n  Oops: general protection fault, probably for non-canonical address\n  0xdffffc0000000000\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  RIP: rpfilter_mt (net/ipv6/netfilter/ip6t_rpfilter.c:75)\n  Call Trace:\n  ip6t_do_table (net/ipv6/netfilter/ip6_tables.c:316)\n  nf_hook_slow (net/netfilter/core.c:619)\n  ipv6_rcv (net/ipv6/ip6_input.c:351)\n  __netif_receive_skb_one_core (net/core/dev.c:6216)\n  process_backlog (net/core/dev.c:6680)\n  __napi_poll (net/core/dev.c:7739)\n  net_rx_action (net/core/dev.c:7959)\n  handle_softirqs (kernel/softirq.c:622)\n  do_softirq.part.0 (kernel/softirq.c:523)\n  __local_bh_enable_ip (kernel/softirq.c:450)\n  __dev_queue_xmit (net/core/dev.c:4913)\n  packet_sendmsg (net/packet/af_packet.c:3139)\n  __sys_sendto (net/socket.c:2252)\n  __x64_sys_sendto (net/socket.c:2259)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nReject routes without an inet6_dev immediately after lookup. Such routes\nare not eligible for reverse-path filtering, and the check protects all\nlater rt6i_idev dereferences."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"f4de78756b0fddbd125b2b1b77c74f2eccc8e977","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"1681ab6dd1271f2f36047490793b78b1848bbcc9","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"65487e9e99431ffcf05024a817f51ee4e3bd9b47","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"f49da48bd679cfee646d6a40dd02b1933de577d1","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"eafe081ea77d25b5c8e601680671b4ecb4520e7d","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"3a7384bc2e66217c9a01a392281334f4423740a0","versionType":"git"},{"version":"e26f9a480fb6c1b614660e824d69a74e2ce990f3","status":"affected","lessThan":"1b9b5323725e458906c7620a3bc10398b51ad954","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/netfilter/ip6t_rpfilter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/netfilter/ip6t_rpfilter.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f4de78756b0fddbd125b2b1b77c74f2eccc8e977"},{"url":"https://git.kernel.org/stable/c/1681ab6dd1271f2f36047490793b78b1848bbcc9"},{"url":"https://git.kernel.org/stable/c/65487e9e99431ffcf05024a817f51ee4e3bd9b47"},{"url":"https://git.kernel.org/stable/c/f49da48bd679cfee646d6a40dd02b1933de577d1"},{"url":"https://git.kernel.org/stable/c/290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40"},{"url":"https://git.kernel.org/stable/c/eafe081ea77d25b5c8e601680671b4ecb4520e7d"},{"url":"https://git.kernel.org/stable/c/3a7384bc2e66217c9a01a392281334f4423740a0"},{"url":"https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:18:30.044Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}