CVE-2026-98306— seg6: IPIP解封装时IPSKB_L3SLAVE标志设置漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
在 Linux 内核中，已修复以下漏洞： seg6：在 IPIP 解封装时将 IPSKB_L3SLAVE 从 IP6SKB_L3SLAVE 设置 当 SRv6 数据包到达绑定到 VRF（虚拟路由和转发实例）的接口时，vrf_ip6_rcv() 会在 IP6CB（IPv6 控制块）中设置 IP6SKB_L3SLAVE，但 decap_and_validate() 从未在 IPCB（IPv4 控制块）中设置 IPSKB_L3SLAVE。在常见情况下，该标志位保持为 0（未设置）；而在启用 CONFIG_IPV6_MIP
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 1d9f5c78903dd25a3556229eb716dd465c5f3573 |
affected |
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 72f410616000d21a0a6ec6c93a60301b9c92e95c |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< e4d7c52f15f572608374947c6c802052e1a2fc82 |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 5130afa025c95faa621adf8bac525baeb2b290d2 |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< f8fb4738ccef5f9d107845b05734a56352747b1a |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< ddf60220c925b54a1714c4722fdbdb12833232d0 |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 7616242a2b37883f7322aaa1d2bd6cd0fed28315 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-98306 基础信息
漏洞信息
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Vulnerability Title
seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation
When an SRv6 packet arrives on an interface enslaved to a VRF,
vrf_ip6_rcv() sets IP6SKB_L3SLAVE in IP6CB, but decap_and_validate()
has never set IPSKB_L3SLAVE in IPCB. The bit stayed clear in the
common case, and with CONFIG_IPV6_MIP6 the leftover frag_max_size of
a reassembled outer packet could even set it, with no VRF involved.
Commit 44930446dde4 ("ipv6: seg6: clear IPv4 control block on IPIP
decapsulation") then made the unreliable bit reliably clear.
The effect of the missing flag is visible with End.DX4 when a
delivery to a local address of the node reaches the socket lookup.
For example, a UDP socket bound to the enslaved ingress interface
does not receive any of the decapsulated packets, while an unbound
socket outside the VRF does.
This contradicts Documentation/networking/vrf.rst: by default the
scope of an unbound UDP or TCP socket is limited to the default VRF.
Set IPSKB_L3SLAVE for IPv4 in decap_and_validate(), which already does
the same for IPv6. The socket lookup then matches the decapsulated
packet like any other packet received on that enslaved interface. Such
a packet matches an unbound UDP or TCP socket only when
udp_l3mdev_accept or tcp_l3mdev_accept is set.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-98306 的公开POC
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|---|
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CVE-2026-98306 补丁与修复 (8)
同批安全公告 · Linux · 2026-10-06 · 共 208 条
| CVE-2026-98323 | 9.8 CRITICAL | RDMA/siw 分片头拷贝边界漏洞 |
| CVE-2026-98365 | 9.8 CRITICAL | RDMA/rxe mr_check_range() 整数溢出导致越界访问漏洞 |
| CVE-2026-98282 | 8.8 HIGH | PowerPC IOMMU iommu_tce_check_ioba 溢出验证修复 |
| CVE-2026-98283 | 8.8 HIGH | KVM: PPC Book3S HV tlbie_all_lpid 使用后释放漏洞 |
| CVE-2026-98339 | 8.8 HIGH | cfg80211 移除过时条目时过滤BSS类型漏洞 |
| CVE-2026-98171 | 8.8 HIGH | smb 客户端修复复合 PDU 中 next_buffer UAF 及 NextCommand 越界漏洞 |
| CVE-2026-98261 | 8.1 HIGH | CIFS 服务器 cifs_chan_skip_or_disable() 函数中的使用后释放漏洞 |
| CVE-2026-98357 | 8.1 HIGH | IB/isert 释放连接前等待控制PDU完成漏洞 |
| CVE-2026-98239 | 8.1 HIGH | lan743x 网卡 RX 校验和使用后释放漏洞 |
| CVE-2026-98305 | 7.8 HIGH | mxl862xx 网络驱动在 teardown 时禁用统计轮询 |
| CVE-2026-98341 | 7.8 HIGH | WiFi: cfg80211驱动扫描请求释放漏洞 |
| CVE-2026-98320 | 7.8 HIGH | netfilter flowtable 在流释放前持有 ct 引用漏洞 |
| CVE-2026-98228 | 7.8 HIGH | MIPS EQE4 系统内核配置错误 |
| CVE-2026-98229 | 7.8 HIGH | Linux内核xfrm安全路径重置前保存输入状态数据 |
| CVE-2026-98318 | 7.8 HIGH | SMB客户端修复相对原生符号链接目标验证漏洞 |
| CVE-2026-98315 | 7.8 HIGH | NTFS运行列表更新缺少锁保护 |
| CVE-2026-98260 | 7.8 HIGH | exec 清理 POSIX 定时器漏洞 |
| CVE-2026-98256 | 7.8 HIGH | Signal 执行函数竞争条件漏洞 |
| CVE-2026-98258 | 7.8 HIGH | Linux内核posix-cpu-timers释放过期列表定时器漏洞 |
| CVE-2026-98254 | 7.8 HIGH | swiotlb 高内存页查找使用调整后的地址 |
显示前 20 条，共 208 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98306
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