CVE-2026-80840— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于IPIP解封装时未清除IPv4控制块，导致内部IPv4数据包保留外部IPv6控制数据，攻击者可通过特制数据包触发越界写入，可能导致内核内存损坏。
可能的 ATT&CK 技术 2 AI
T1190 · Exploit Public-Facing Application T1210 · Exploitation of Remote Services影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 10fd1a8f58ac619a9e251f2858e2e2c8fd6cd667 |
affected |
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< eb0f422487228e140f3d609b032ac61aedcab8fa |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 9039e4f3e1c0ffe2b575b655b3f58fdd10f7e40c |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< f52f1e75716d2ee49e013edf204ac92337c72fd8 |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 0e3f01fe2e704e76af4385b8a1742641885a191c |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< 3e4476e58343fb8f2fffced9e22d935376b17aaf |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< bf1c1151560d11036a144d917fa4c131831342d7 |
affected | ||
891ef8dd2a8d14e4e73a81dcdb135b574c57f556< f4be3b391265e24c7720fc867c50062b436acf33 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2026-80840 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
ipv6: seg6: clear IPv4 control block on IPIP decapsulation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ipv6: seg6: clear IPv4 control block on IPIP decapsulation
End.DX4 and End.DT4 decapsulate an IPv4 packet through
decap_and_validate() and send it directly to IPv4 routing. The inner
packet therefore bypasses ip_rcv_core(), which normally clears IPCB
before IPv4 interprets skb->cb.
The skb instead retains IP6CB data from the outer packet. IP6CB and
IPCB use the same skb->cb storage, so IP6CB(skb)->lastopt overlaps
IPCB(skb)->opt.optlen and srr, while IP6CB(skb)->nhoff overlaps rr and
ts.
The sender can make the stale optlen byte nonzero with a valid outer
extension-header chain. The reproducers put an eight-byte Destination
Options header immediately after the 40-byte IPv6 header and before the
Segment Routing Header. ipv6_destopt_rcv() records the sender-controlled
Destination Options offset in both lastopt and nhoff, setting them to
40. On the reproduced little-endian x86-64 kernel, IPv4 therefore sees
optlen = 40 and rr = 40.
Both tcp_v4_save_options() and __ip_options_echo() skip option copying
when optlen is zero. Here optlen is 40, so the TCP SYN path allocates
room for 40 bytes of option data and calls __ip_options_echo(). The
stale rr value makes that function read inner packet byte 41 as the
Record Route option length. The reproducers set that sender-controlled
byte to 255, so __ip_options_echo() copies 255 bytes into the 40-byte
option-data area.
Separate End.DX4 and End.DT4 reproducers on the unpatched v7.2-rc5
kernel both produced:
BUG: KASAN: slab-out-of-bounds in __ip_options_echo()
Write of size 255
The relevant End.DX4 call path is:
__ip_options_echo
tcp_v4_route_req
tcp_conn_request
tcp_v4_conn_request
tcp_rcv_state_process
tcp_v4_do_rcv
tcp_v4_rcv
ip_protocol_deliver_rcu
ip_local_deliver_finish
ip_local_deliver
input_action_end_dx4_finish
input_action_end_dx4
The relevant End.DT4 call path is:
__ip_options_echo
tcp_v4_route_req
tcp_conn_request
tcp_v4_conn_request
tcp_rcv_state_process
tcp_v4_do_rcv
tcp_v4_rcv
ip_protocol_deliver_rcu
ip_local_deliver_finish
ip_local_deliver
input_action_end_dt4
tcp_v4_save_options() is inlined into the tcp_v4_route_req() path, so
it does not appear as a separate frame.
When decap_and_validate() handles IPPROTO_IPIP, save the ingress
interface from IP6CB, clear IPCB, and restore the saved value. Doing
this in the common decapsulation path covers End.DX4, End.DT4, and
End.DT46's IPv4 arm.
Use IP6CB(skb)->iif rather than skb->skb_iif. These actions run after
l3mdev processing, which can replace skb_iif with the L3 master;
IP6CB iif still records the receiving interface set at IPv6 ingress.
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
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于IPIP解封装时未清除IPv4控制块，导致内部IPv4数据包保留外部IPv6控制数据，攻击者可通过特制数据包触发越界写入，可能导致内核内存损坏。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-80840 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80840 补丁与修复 (8)
CVE-2026-80840 其他参考 (1)
同批安全公告 · Linux · 2026-09-04 · 共 156 条
| CVE-2026-80865 | Linux kernel 安全漏洞 | |
| CVE-2026-80856 | Linux kernel 安全漏洞 | |
| CVE-2026-80857 | Linux kernel 安全漏洞 | |
| CVE-2026-80858 | Linux kernel 安全漏洞 | |
| CVE-2026-80859 | Linux kernel 安全漏洞 | |
| CVE-2026-80860 | Linux kernel 安全漏洞 | |
| CVE-2026-80861 | Linux kernel 安全漏洞 | |
| CVE-2026-80862 | Linux kernel 安全漏洞 | |
| CVE-2026-80863 | Linux kernel 安全漏洞 | |
| CVE-2026-80864 | Linux kernel 安全漏洞 | |
| CVE-2026-80870 | Linux kernel 安全漏洞 | |
| CVE-2026-80874 | Linux kernel 安全漏洞 | |
| CVE-2026-80873 | Linux kernel 安全漏洞 | |
| CVE-2026-80872 | Linux kernel 安全漏洞 | |
| CVE-2026-80871 | Linux kernel 安全漏洞 | |
| CVE-2026-80868 | Linux kernel 安全漏洞 | |
| CVE-2026-80866 | Linux kernel 安全漏洞 | |
| CVE-2026-80867 | Linux kernel 安全漏洞 | |
| CVE-2026-80855 | Linux kernel 安全漏洞 | |
| CVE-2026-80869 | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80840
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