GHSA-PM3C-RJ84-8W7W
Vulnerability from github – Published: 2026-10-09 09:31 – Updated: 2026-10-09 09:31In the Linux kernel, the following vulnerability has been resolved:
netfilter: ip6t_rpfilter: reject routes without inet6_dev
ip6_route_lookup() can return an error-free route whose rt6i_idev is NULL. Lowering an external nexthop device's MTU below IPV6_MIN_MTU tears down its inet6_dev while fib6_ifdown() leaves routes using nexthop objects in the FIB. An unprivileged user can construct this state with rtnetlink in a private user and network namespace, then trigger a NULL dereference through an IPv6 rpfilter lookup:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: rpfilter_mt (net/ipv6/netfilter/ip6t_rpfilter.c:75) Call Trace: ip6t_do_table (net/ipv6/netfilter/ip6_tables.c:316) nf_hook_slow (net/netfilter/core.c:619) ipv6_rcv (net/ipv6/ip6_input.c:351) __netif_receive_skb_one_core (net/core/dev.c:6216) process_backlog (net/core/dev.c:6680) __napi_poll (net/core/dev.c:7739) net_rx_action (net/core/dev.c:7959) handle_softirqs (kernel/softirq.c:622) do_softirq.part.0 (kernel/softirq.c:523) __local_bh_enable_ip (kernel/softirq.c:450) __dev_queue_xmit (net/core/dev.c:4913) packet_sendmsg (net/packet/af_packet.c:3139) __sys_sendto (net/socket.c:2252) __x64_sys_sendto (net/socket.c:2259) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt
Reject routes without an inet6_dev immediately after lookup. Such routes are not eligible for reverse-path filtering, and the check protects all later rt6i_idev dereferences.
{
"affected": [],
"aliases": [
"CVE-2026-98379"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-09T08:16:56Z",
"severity": null
},
"details": "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\u0027s 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.",
"id": "GHSA-pm3c-rj84-8w7w",
"modified": "2026-10-09T09:31:05Z",
"published": "2026-10-09T09:31:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98379"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1681ab6dd1271f2f36047490793b78b1848bbcc9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b9b5323725e458906c7620a3bc10398b51ad954"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3a7384bc2e66217c9a01a392281334f4423740a0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/65487e9e99431ffcf05024a817f51ee4e3bd9b47"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eafe081ea77d25b5c8e601680671b4ecb4520e7d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f49da48bd679cfee646d6a40dd02b1933de577d1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f4de78756b0fddbd125b2b1b77c74f2eccc8e977"
}
],
"schema_version": "1.4.0",
"severity": []
}
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