CVE-2026-80587— 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 5.6版本存在安全漏洞，该漏洞源于MPTCP对传入子选项的组合处理不当，未能正确识别互斥选项，可能导致远程攻击者利用特制MPTCP子选项造成数据泄露、连接状态损坏或拒绝服务。
可能的 ATT&CK 技术 1 AI
T1213 · Data from Information Repositories影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | eda7acddf8080bb2d022a8d4b8b2345eb80c63ec< 0e2210af439755a2af352eea4178261dcf61742e |
affected |
eda7acddf8080bb2d022a8d4b8b2345eb80c63ec< dc1d8d3eb345c616fbe922a010fa391c72c54d52 |
affected | ||
eda7acddf8080bb2d022a8d4b8b2345eb80c63ec< 099bfcbd0c16ae9b50aba2a1bea033e63f895da7 |
affected | ||
eda7acddf8080bb2d022a8d4b8b2345eb80c63ec< a04dcc784959e4702048785d87e0d029bd2fbdcb |
affected | ||
eda7acddf8080bb2d022a8d4b8b2345eb80c63ec< 6bab907292155513af397a12ccb488acbfc30d79 |
affected | ||
eda7acddf8080bb2d022a8d4b8b2345eb80c63ec< b6ee361524641f57b2e2363f7737f20e17f67827 |
affected | ||
5.6 |
affected | ||
< 5.6 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-80587 基础信息
漏洞信息
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Vulnerability Title
mptcp: avoid combining some incoming suboptions
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mptcp: avoid combining some incoming suboptions
Some MPTCP suboptions are mutually exclusive according to the RFC8684,
but also because in different places, the code doesn't expect some
combinations to be present. That's specially true for suboptions that
would be present twice, but with different attributes.
The new restrictions are the same as the ones applied on the output
side, with mptcp_write_options. The same rules can be reused with a
small fix: an MP_FASTCLOSE can be used with a DSS when the sender picks
this option [1], which is not the case on Linux. Here are the rules:
Which options can be used together?
X: mutually exclusive
O: often used together
C: can be used together in some cases
P: could be used together but we prefer not to (optimisations)
| Opt: | MPC | MPJ | DSS | ADD | RM | PRIO | FAIL | FC |
|------|------|------|------|------|------|------|------|------|
| MPC |------|------|------|------|------|------|------|------|
| MPJ | X |------|------|------|------|------|------|------|
| DSS | X | X |------|------|------|------|------|------|
| ADD | X | X | P |------|------|------|------|------|
| RM | C | C | C | P |------|------|------|------|
| PRIO | X | C | C | C | C |------|------|------|
| FAIL | X | X | C | X | X | X |------|------|
| FC | X | X | P | X | X | X | X |------|
| RST | X | X | X | X | X | X | O | O |
|------|------|------|------|------|------|------|------|------|
The only difference is with the 'P': another stack could send and
ADD_ADDR with other suboptions (DSS, RM_ADDR), and this should be
allowed.
A few points of attention:
- In theory, an MP_CAPABLE could be used with a RM_ADDR, but there is
no reason to add it with a SYN. Note that even with a 4th ACK, it
doesn't seem to be useful, except when IDs are known in advance via
another channel. Better not to break that.
- Now, combining both an MP_CAPABLE and an MP_JOIN will no longer
result to a reject of the two options, but only the second suboption
is ignored. That seems OK to do that for this unexpected error. At
least now all inconsistent combinations are handled the same way.
This could change later in next. This also means the explicit checks
for having both MPC + MPJ in subflow.c will now be unreachable.
That's fine, they will be removed in a follow-up patch.
- In case of conflicting combinations, the extra suboption(s) is/are
ignored: having such combinations either means the remote peer is
buggy, or is evil. The simplest action is then taken in this case:
stop processing the current suboption.
- In mp_opt->suboptions, there is also a bit reserved to the checksum,
which can be used in an MP_CAPABLE and a DSS. Each time a DSS option
can be used in parallel with another option, the checksum can be set,
so the verification is combined into a new OPTIONS_MPTCP_DSS macro.
- An MP_CAPABLE ACK can carry a Data-Level Length, and an optional
Checksum: they are the same as the ones found in a DSS, because a DSS
cannot be used in parallel to an MP_CAPABLE. Similarly, even if there
is room, a DSS cannot be used with an MP_JOIN.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 5.6版本存在安全漏洞，该漏洞源于MPTCP对传入子选项的组合处理不当，未能正确识别互斥选项，可能导致远程攻击者利用特制MPTCP子选项造成数据泄露、连接状态损坏或拒绝服务。
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-2026-80587 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80587 补丁与修复 (5)
CVE-2026-80587 其他参考 (1)
同批安全公告 · Linux · 2026-08-26 · 共 92 条
| CVE-2026-80589 | 9.8 CRITICAL | 磁盘块：释放未添加磁盘时停止超时定时器 |
| CVE-2026-74752 | 9.8 CRITICAL | SCTP协议Cookie AUTH状态校验前使用漏洞 |
| CVE-2026-80519 | 9.8 CRITICAL | OpenVPN 加密回调清理漏洞 |
| CVE-2026-74746 | 9.8 CRITICAL | Netfilter 流表 GC 可见元组发布顺序漏洞 |
| CVE-2026-80528 | 9.8 CRITICAL | Ceph 文件回收竞态漏洞 |
| CVE-2026-74744 | 9.8 CRITICAL | Linux内核ipvlan模块继承headroom/tailroom |
| CVE-2026-74743 | 9.8 CRITICAL | macvlan 继承底层设备头部尾部空间 |
| CVE-2026-80561 | 9.8 CRITICAL | libceph 多个不安全解码远程代码执行漏洞 |
| CVE-2026-80558 | 9.8 CRITICAL | Ceph libceph 模块 OSID 索引缺陷 |
| CVE-2026-80586 | 9.8 CRITICAL | Linux内核 MPTCP 模块异常尺寸处理缺陷 |
| CVE-2026-80557 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74737 | 9.8 CRITICAL | TI AM65 CPSW 驱动端口ID提取错误 |
| CVE-2026-80585 | 9.4 CRITICAL | Linux 内核 MPTCP 快开子流标记错误 |
| CVE-2026-74751 | 9.4 CRITICAL | RISC-V ZBB strnlen越界读取 |
| CVE-2026-80554 | 9.3 CRITICAL | Linux s390/vfio_ccw 通道程序段数限制 |
| CVE-2026-80551 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80547 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-80576 | 8.8 HIGH | AMD GPU 驱动拒绝超大IB |
| CVE-2026-80552 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-80553 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 92 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80587
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