CVE-2026-98441— Linux Kernel 网络调度器竞态条件漏洞
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，以下漏洞已被修复： net/sched: act_ct：避免修改共享的未确认连接跟踪（ct）条目 当携带未确认连接跟踪条目的 skb（套接字缓冲区）被克隆时，我们可能会再次处理这两个克隆包，但此时它们携带的扩展集合不同。 事件序列如下： 1. 第一个克隆包尝试提交（commit），并运行辅助函数（helpers），将扩展指针写入期望列表（expectation list）。 2. 随后，该克隆包未能完成确认，导致条目仍处于未确认状态。 3. 第二个克隆包随后尝试提交标签或执行 NAT，并为此
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | a21b06e7319129994f339ed47f512bbe57b77f5b< c812bb4aea13d385d048b5b24756aee2edf6f99e |
affected |
a21b06e7319129994f339ed47f512bbe57b77f5b< 2b783c562c3238ff50c34fd7a72a735c9cc73d9a |
affected | ||
a21b06e7319129994f339ed47f512bbe57b77f5b< 4a04ed91575819fb1859311113e95700b709bec7 |
affected | ||
a21b06e7319129994f339ed47f512bbe57b77f5b< b097d9d7a5b09c8ec5c4c1a08e35ac5a66b06b44 |
affected | ||
a21b06e7319129994f339ed47f512bbe57b77f5b< f85009dfcd65e5969526b0db7a49b5413746e630 |
affected | ||
6.2 |
affected | ||
< 6.2 |
unaffected | ||
6.6.160≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-98441 基础信息
漏洞信息
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Vulnerability Title
net/sched: act_ct: avoid modifying shared unconfirmed ct entry
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_ct: avoid modifying shared unconfirmed ct entry
In a case where skb with an unconfirmed ct entry gets cloned, we may
end up processing both again but with different sets of extensions.
The series of events:
1. The first clone wants to commit and runs the helpers wiring up
the extension pointer into the expectation list.
2. Then it looses the confirmation keeping the entry unconfirmed.
3. Second clone now wants to commit labels or run NAT and adds the
new extension for that breaking the pointer in the expectation
list causing UAF on the destruction path later.
While this is possible to trigger, there should be no practical
network pipeline where we need to process both clones without
modifications in the same zone. So, let's just reset the entry in
case for some reason we got an skb with a shared one. This doesn't
affect any known use cases, but avoids any potential problems with
sharing and modification of the unconfirmed ct entry.
Unlike openvswitch module, act_ct allows for NAT without commit.
Changing that would be a uAPI break. So, act_ct needs to reset on NAT
regardless of the commit flag to avoid reallocation of the extension
space. This, however, doesn't really change the picture for sensible
networking cases as there should be no need to run the same packet
twice (before and after the clone) through conntrack without packet
header or zone changes and without commit.
The fixes tag points to the introduction of helpers, since that's the
main UAF trigger for the sharing.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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
受影响产品
二、漏洞 CVE-2026-98441 的公开POC
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|---|
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CVE-2026-98441 补丁与修复 (5)
同批安全公告 · Linux · 2026-10-18 · 共 435 条
| CVE-2026-98548 | 9.8 CRITICAL | Linux SCTP 协议 旧 Cookie 错误 数据包丢弃漏洞 |
| CVE-2026-98490 | 9.8 CRITICAL | Open vSwitch conntrack 模块 辅助函数释放后使用漏洞 |
| CVE-2026-98464 | 9.3 CRITICAL | Linux RISC-V KVM 定时器回调竞态条件漏洞 |
| CVE-2026-98549 | 9.1 CRITICAL | Linux TCP 重传队列边界合并漏洞 |
| CVE-2026-98451 | 8.8 HIGH | Samba SMB 客户端非普通文件句柄处理漏洞 |
| CVE-2026-98466 | 8.2 HIGH | KVM arm64 版本 hyp 栈页面越界访问漏洞 |
| CVE-2026-98532 | 8.1 HIGH | Linux IPv6 协议栈越界读取漏洞 |
| CVE-2026-98499 | 8.1 HIGH | HID wacom 驱动越界读取漏洞 |
| CVE-2026-98454 | 8.1 HIGH | SMB 客户端创建上下文越界读取漏洞 |
| CVE-2026-98524 | 7.8 HIGH | RDS IB 映射 MR 失败时 SG 列表未清零漏洞 |
| CVE-2026-98520 | 7.8 HIGH | Linux 内核 drm/amdkfd 释放后使用漏洞 |
| CVE-2026-98491 | 7.8 HIGH | Open vSwitch 连接跟踪数据项修改漏洞 |
| CVE-2026-98507 | 7.8 HIGH | Linux 内核匿名 VMA 初始化竞态条件漏洞 |
| CVE-2026-98436 | 7.8 HIGH | AMD XDNA 设备缓冲区导出禁用漏洞 |
| CVE-2026-98510 | 7.8 HIGH | Intel Xe DRM 竞态条件漏洞 |
| CVE-2026-98515 | 7.8 HIGH | Nouveau 驱动双重释放漏洞 |
| CVE-2026-98487 | 7.8 HIGH | Linux 网桥 MDB 远程拒绝服务漏洞 |
| CVE-2026-98517 | 7.8 HIGH | Linux 内核 nouveau 驱动 UAF 漏洞 |
| CVE-2026-98443 | 7.8 HIGH | XFS 修复恢复 iunlink 桶时的游标和指针处理漏洞 |
| CVE-2026-98442 | 7.8 HIGH | Linux 内核 act_ct 扩展重分配导致 UAF 漏洞 |
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