CVE-2026-74638— 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 6.18.45之前版本和7.1.9之前版本存在安全漏洞，该漏洞源于V3D调度器超时处理程序未序列化，并发超时处理可能导致GPU挂起和UI冻结。
影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 35e4079bf1a2570abffce6ababa631afcf8ea0e5< 5884851a096d8afcdf91f0e542bac193035183a6 |
affected |
35e4079bf1a2570abffce6ababa631afcf8ea0e5< c22a45817b9c92aa0391db60e2ed467c7e6027d7 |
affected | ||
35e4079bf1a2570abffce6ababa631afcf8ea0e5< 4da94744707b27a3ae1197bdd7127da4505dc5b1 |
affected | ||
5235b56b7e5449d990d21d78723b1a5e7bb5738e |
affected | ||
12125f7d9c15e6d8ac91d10373b2db2f17dcf767 |
affected | ||
a5f162727b91e480656da1876247a91f651f76de |
affected | ||
422a8b10ba42097a704d6909ada2956f880246f2 |
affected | ||
6.1.139< 6.2 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-74638 基础信息
漏洞信息
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Vulnerability Title
drm/v3d: Serialize the scheduler timeout handlers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/v3d: Serialize the scheduler timeout handlers
V3D exposes several independent hardware queues (BIN, RENDER, TFU and
CSD) but has only a single, global reset. A timeout on any one queue
therefore has to stop, reset and restart the schedulers of every other
queue as well. That makes concurrent timeout handlers unsafe.
`reset_lock` was never able to make them safe, as a driver-side lock can
only cover the driver's &drm_sched_backend_ops.timedout_job callback.
The scheduler handles the timed out job and its pending list around that
callback, outside of the driver's control, so a global reset triggered
by one queue can still interfere with another queue that is in the
middle of handling a timeout of its own.
Consequently, if a reset happens in the CSD queue while a CL-intensive
application is running, the global reset stops and restarts the CL
queue's scheduler while that queue is handling a timeout of its own. As
drm_sched_stop() and drm_sched_start() subtract and add the credits of
every job sitting on the pending list of the scheduler they are called
on, and as the CL queue's handler concurrently takes its job off that
same list and puts it back, the stop and the start no longer see the
same set of jobs. The CL queue is left with more credits in flight than
its limit:
[ 327.302739] ------------[ cut here ]------------
[ 327.302744] WARNING: CPU: 2 PID: 43 at drivers/gpu/drm/scheduler/sched_main.c:102 drm_sched_run_job_work+0x238/0x4d0 [gpu_sched]
[ 327.302884] CPU: 2 UID: 0 PID: 43 Comm: kworker/u16:1 Not tainted 6.18.39-v8-16k+ #3 PREEMPT
[ 327.302889] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT)
[ 327.302893] Workqueue: v3d_bin drm_sched_run_job_work [gpu_sched]
[ 327.302984] Call trace:
[ 327.302987] drm_sched_run_job_work+0x238/0x4d0 [gpu_sched] (P)
[ 327.302997] process_scheduled_works+0x180/0x3d0
[ 327.303010] worker_thread+0x268/0x3e8
[ 327.303016] kthread+0x140/0x250
[ 327.303022] ret_from_fork+0x10/0x20
[ 327.303031] ---[ end trace 0000000000000000 ]---
From that point on, the credit count of the CL queue is broken, causing
a complete GPU hang and UI freeze.
The DRM scheduler already provides a mechanism to serialize the timeout
handlers of different schedulers: an ordered workqueue passed as
drm_sched_init()'s @timeout_wq parameter. By default, each scheduler
queues its timeout work on the system workqueue, which runs the handlers
concurrently. Give all of the queues a shared ordered workqueue instead,
as recommended by the DRM scheduler documentation for hardware that has
distinct queues but resets globally.
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 6.18.45之前版本和7.1.9之前版本存在安全漏洞，该漏洞源于V3D调度器超时处理程序未序列化，并发超时处理可能导致GPU挂起和UI冻结。
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-2026-74638 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74638 补丁与修复 (3)
同批安全公告 · Linux · 2026-08-22 · 共 149 条
| CVE-2026-74705 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74612 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74688 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74669 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74723 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74727 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74662 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74628 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74608 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74597 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74617 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74616 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74730 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74586 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74611 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74591 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74587 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74588 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74712 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74665 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 149 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74638
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