CVE-2026-74284— 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net/sched/sch_hfsc在出队时对类被动状态处理不当，可能导致网络队列停滞。
影响版本矩阵 27
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7< a425c82ff06cda5165e0de3de8c2a445ec1f863e |
affected |
a5efc95a33bd4fcb879250852828cc58c7862970< fc973ecd1a079b9a87c360478542f3a56dea085b |
affected | ||
0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87< 15720cd8fa3fc625146128f89a8e11b0449a20a7 |
affected | ||
9030a91235ae4845ec71902c3e0cecfc9ed1f2df< b2a017bfcf565721918ec7355a373911d2f2a227 |
affected | ||
d06476714d2819b550e0cc39222347e2c8941c9d< 9221a594c72a1446137926d4c2aa04e345f798dc |
affected | ||
51eb3b65544c9efd6a1026889ee5fb5aa62da3bb< 66dbb13eeb2fc339f8f548a9076be4c1a94857b0 |
affected | ||
51eb3b65544c9efd6a1026889ee5fb5aa62da3bb< 3a49bbae676fef1ffe548971e6229ae2adeb9d10 |
affected | ||
51eb3b65544c9efd6a1026889ee5fb5aa62da3bb< 90b662ea25f5e83bb3b8ccec5b93ced810b92fb8 |
affected | ||
| … +19 条更多 | |||
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一、 漏洞 CVE-2026-74284 基础信息
漏洞信息
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Vulnerability Title
net/sched: sch_hfsc: Don't make class passive twice
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch_hfsc: Don't make class passive twice
update_vf() is called from two places for the same class during a single
dequeue when the class's child qdisc (e.g. codel/fq_codel) drops its last
packets while dequeuing:
1. The child calls qdisc_tree_reduce_backlog(), which, now that the child
is empty, invokes hfsc_qlen_notify() -> update_vf(cl, 0, 0) and turns
the class passive (cl_nactive is decremented up the hierarchy).
2. hfsc_dequeue() then calls update_vf(cl, qdisc_pkt_len(skb), cur_time)
to charge the dequeued bytes.
On the second call the class is already passive, but its child qdisc is
still empty, so update_vf() arms go_passive again:
if (cl->qdisc->q.qlen == 0 && cl->cl_flags & HFSC_FSC)
go_passive = 1;
The leaf is then skipped by the cl_nactive == 0 check inside the loop,
which does not clear go_passive, so the stale go_passive propagates to the
parent and decrements its cl_nactive a second time. A parent that still
has other active children is driven to cl_nactive == 0 and removed from
the vttree, even though those siblings are still backlogged. They are
never dequeued again and the qdisc stalls.
Fix this by only arming go_passive when the class is actually active, so an
already-passive class no longer triggers a second passive transition. The
byte accounting (cl->cl_total += len) still runs for every ancestor, so
dequeued bytes continue to be counted exactly once.
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net/sched/sch_hfsc在出队时对类被动状态处理不当，可能导致网络队列停滞。
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-2026-74284 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74284 补丁与修复 (8)
同批安全公告 · Linux · 2026-08-15 · 共 845 条
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72463 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72248 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72477 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72381 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72473 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72472 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74406 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72139 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74401 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74376 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72130 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 845 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74284
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