CVE-2026-98379 in Linux
摘要
由 VulDB • 2026-10-09
在 Linux 内核中，已修复以下漏洞：
netfilter: ip6t_rpfilter：拒绝缺少 inet6_dev 的路由
ip6_route_lookup() 可能返回一个无错误但 rt6i_idev 为 NULL 的路由。将外部下一跳设备的 MTU 降低到 IPV6_MIN_MTU 之下会拆除其 inet6_dev，而 fib6_ifdown() 会使使用下一跳对象的路由保留在 FIB（转发信息库）中。非特权用户可以在私有用户和网络命名空间中通过 rtnetlink 构造此状态，然后通过 IPv6 rpfilter 查找触发空指针解引用：
``` 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 ```
在查找后立即拒绝缺少 inet6_dev 的路由。此类路由不符合反向路径过滤的条件，该检查保护了所有后续的 rt6i_idev 解引用操作。
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