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CVE-2026-98379

netfilter: ip6t_rpfilter: reject routes without inet6_dev

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In 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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in f4de78756b0fddbd125b2b1b77c74f2eccc8e977; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in 1681ab6dd1271f2f36047490793b78b1848bbcc9; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in 65487e9e99431ffcf05024a817f51ee4e3bd9b47; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in f49da48bd679cfee646d6a40dd02b1933de577d1; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in 290c96e5d9471d1ded9ab1e8ffbb04f6ee7b0f40; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in eafe081ea77d25b5c8e601680671b4ecb4520e7d; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in 3a7384bc2e66217c9a01a392281334f4423740a0; From e26f9a480fb6c1b614660e824d69a74e2ce990f3 · fixed in 1b9b5323725e458906c7620a3bc10398b51ad954

  • Linux Linux

    3.3

  • KernelLinux

    From 3.3.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9

References 8

git.kernel.org