CVE-2026-68441— 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，该漏洞源于对TC_ACT_REDIRECT处理不当，当qdisc过滤器链返回该结果时，qdisc分类函数未处理重定向，导致数据包被静默转发而非重定向，且bpf_redirect()在bpf_net_context未设置时可能导致空指针解引用，进而引发拒绝服务。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 27b29f63058d26c6c1742f1993338280d5a41dc6< 9cbad9c8125f5fe377c0800ab08f7196eab44456 |
affected |
27b29f63058d26c6c1742f1993338280d5a41dc6< c8fd74445e86f88096d2f6cf0f9e4d54d8ed1781 |
affected | ||
27b29f63058d26c6c1742f1993338280d5a41dc6< ec48b3be2c8595dd290be883dbd4fb8b2f9f5d5e |
affected | ||
4.4 |
affected | ||
< 4.4 |
unaffected | ||
6.18.57≤ 6.18.* |
unaffected | ||
7.1.6≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-68441 基础信息
漏洞信息
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Vulnerability Title
net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
When a TC filter attached to a qdisc filter chain returns
TC_ACT_REDIRECT (ex: via an eBPF program calling bpf_redirect() or an
act_bpf action), the redirect was silently lost i.e no qdisc classify
function handled TC_ACT_REDIRECT, so the packet fell through the
switch and was enqueued normally instead of being redirected.
This has been broken since bpf_redirect() was introduced for TC in
commit 27b29f63058d ("bpf: add bpf_redirect() helper"). We got lucky
for a long time because bpf_net_context was a per-CPU variable that
was always available.
commit 401cb7dae813 ("net: Reference bpf_redirect_info via task_struct
on PREEMPT_RT.") turned bpf_net_context into a task_struct member that
is only set up by explicit callers. Without a caller setting it up,
bpf_redirect() itself crashes with a NULL pointer dereference in
bpf_net_ctx_get_ri(). However, even with bpf_net_context available,
TC_ACT_REDIRECT from qdisc filter chains cannot be honored without
adding skb_do_redirect() calls to every qdisc classify function, which
would require changes across net/sched/. Isolate it to ebpf core where
it belongs.
Instead, add a tcf_classify_qdisc() inline helper in pkt_cls.h, as a
wrapper around tcf_classify() for use by qdisc classify functions and
tcf_qevent_handle(). When the classify verdict is TC_ACT_REDIRECT,
the wrapper converts it to TC_ACT_SHOT, dropping the packet rather
than letting it continue silently. Dropping is preferred over
letting the packet through because the user immediately sees packet
loss. Silently passing the packet through would hide the problem and
leave the user wondering why their redirect is not working.
The clsact fast path, tc_run() continues to call tcf_classify() directly
and is unaffected: TC_ACT_REDIRECT is returned as-is and handled by
sch_handle_egress/ingress() calling skb_do_redirect() as before.
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，该漏洞源于对TC_ACT_REDIRECT处理不当，当qdisc过滤器链返回该结果时，qdisc分类函数未处理重定向，导致数据包被静默转发而非重定向，且bpf_redirect()在bpf_net_context未设置时可能导致空指针解引用，进而引发拒绝服务。
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-2026-68441 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-68441 补丁与修复 (2)
CVE-2026-68441 其他参考 (1)
同批安全公告 · Linux · 2026-08-12 · 共 22 条
| CVE-2026-68431 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68432 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68433 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68446 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68445 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68440 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68442 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68447 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-68439 | Linux kernel 安全漏洞 | |
| CVE-2026-68450 | Linux kernel 安全漏洞 | |
| CVE-2026-68449 | Linux kernel 安全漏洞 | |
| CVE-2026-68448 | Linux kernel 安全漏洞 | |
| CVE-2026-68444 | Linux kernel 安全漏洞 | |
| CVE-2026-68443 | Linux kernel 安全漏洞 | |
| CVE-2026-68429 | Linux kernel 安全漏洞 | |
| CVE-2026-68438 | Linux kernel 安全漏洞 | |
| CVE-2026-68437 | Linux kernel 安全漏洞 | |
| CVE-2026-68436 | Linux kernel 安全漏洞 | |
| CVE-2026-68435 | Linux kernel 安全漏洞 | |
| CVE-2026-68434 | Linux kernel 安全漏洞 |
显示前 20 条，共 22 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-68441
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