CVE-2026-31667— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于uinput中ff-core循环锁定依赖，可能导致死锁。
可能的 ATT&CK 技术 1 AI
T1562影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ff462551235d8d7d843a005950bc90924fcedede< 71a9729f412e2c692a35c542e14b706fb342927f |
affected |
ff462551235d8d7d843a005950bc90924fcedede< 271ee71a1917b89f6d73ec82dd091c33d92ee617 |
affected | ||
ff462551235d8d7d843a005950bc90924fcedede< 974f7b138c3a96dd5cd53d1b33409cd7b2229dc6 |
affected | ||
ff462551235d8d7d843a005950bc90924fcedede< 546c18a14924eb521fe168d916d7ce28f1e13c1d |
affected | ||
ff462551235d8d7d843a005950bc90924fcedede< a3d6c9c053c9c605651508569230ead633b13f76 |
affected | ||
ff462551235d8d7d843a005950bc90924fcedede< 1e09dfbb4f5d20ee111f92325a00f85778a5f328 |
affected | ||
ff462551235d8d7d843a005950bc90924fcedede< 1534661043c434b81cfde26b97a2fb2460329cf0 |
affected | ||
ff462551235d8d7d843a005950bc90924fcedede< 4cda78d6f8bf2b700529f2fbccb994c3e826d7c2 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-31667 基础信息
漏洞信息
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Vulnerability Title
Input: uinput - fix circular locking dependency with ff-core
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
Input: uinput - fix circular locking dependency with ff-core
A lockdep circular locking dependency warning can be triggered
reproducibly when using a force-feedback gamepad with uinput (for
example, playing ELDEN RING under Wine with a Flydigi Vader 5
controller):
ff->mutex -> udev->mutex -> input_mutex -> dev->mutex -> ff->mutex
The cycle is caused by four lock acquisition paths:
1. ff upload: input_ff_upload() holds ff->mutex and calls
uinput_dev_upload_effect() -> uinput_request_submit() ->
uinput_request_send(), which acquires udev->mutex.
2. device create: uinput_ioctl_handler() holds udev->mutex and calls
uinput_create_device() -> input_register_device(), which acquires
input_mutex.
3. device register: input_register_device() holds input_mutex and
calls kbd_connect() -> input_register_handle(), which acquires
dev->mutex.
4. evdev release: evdev_release() calls input_flush_device() under
dev->mutex, which calls input_ff_flush() acquiring ff->mutex.
Fix this by introducing a new state_lock spinlock to protect
udev->state and udev->dev access in uinput_request_send() instead of
acquiring udev->mutex. The function only needs to atomically check
device state and queue an input event into the ring buffer via
uinput_dev_event() -- both operations are safe under a spinlock
(ktime_get_ts64() and wake_up_interruptible() do not sleep). This
breaks the ff->mutex -> udev->mutex link since a spinlock is a leaf in
the lock ordering and cannot form cycles with mutexes.
To keep state transitions visible to uinput_request_send(), protect
writes to udev->state in uinput_create_device() and
uinput_destroy_device() with the same state_lock spinlock.
Additionally, move init_completion(&request->done) from
uinput_request_send() to uinput_request_submit() before
uinput_request_reserve_slot(). Once the slot is allocated,
uinput_flush_requests() may call complete() on it at any time from
the destroy path, so the completion must be initialised before the
request becomes visible.
Lock ordering after the fix:
ff->mutex -> state_lock (spinlock, leaf)
udev->mutex -> state_lock (spinlock, leaf)
udev->mutex -> input_mutex -> dev->mutex -> ff->mutex (no back-edge)
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
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于uinput中ff-core循环锁定依赖，可能导致死锁。
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-2026-31667 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-04-24 · 共 138 条
| CVE-2026-31637 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31536 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31589 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31669 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31668 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31649 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31633 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31607 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31608 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31609 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31657 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31659 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31636 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-31588 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31570 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31622 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31558 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31553 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31629 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31611 | 8.6 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 138 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31667
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