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CVE-2026-31726— 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uvc在解绑竞争期间存在空指针取消引用，可能导致内核崩溃。

AI 预测 5.5 利用难度: 中等 EPSS 0.16% · P5

影响版本矩阵 22

厂商产品 版本范围状态
Linux Linux 1444e0568bc2c70868e7b8da5b46fc2252acc3f5< 0c00ec409d7b2bce3fcac73188b79a141db7cfda affected
4962e5a2f301d24953f17d6748d986e21566abe1< d92d1532e05b1b31d36d48765e43bf73d793d19f affected
b81ac4395bbeaf36e078dea1a48c02dd97b76235< 0587de744615628c38e33ddc1601160a5ea8c50a affected
b81ac4395bbeaf36e078dea1a48c02dd97b76235< c78e463ee134b4669579d453c81ae00795e4c19a affected
b81ac4395bbeaf36e078dea1a48c02dd97b76235< 8a1128d604c360eca135f15b882b70256a522145 affected
b81ac4395bbeaf36e078dea1a48c02dd97b76235< 1aa9356881ee4ed414bf72d0c56d915492cb5345 affected
b81ac4395bbeaf36e078dea1a48c02dd97b76235< c038ba56b92e410d1caec22b2dc68780a0b42091 affected
b81ac4395bbeaf36e078dea1a48c02dd97b76235< eba2936bbe6b752a31725a9eb5c674ecbf21ee7d affected
… +14 条更多
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一、 漏洞 CVE-2026-31726 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
usb: gadget: uvc: fix NULL pointer dereference during unbind race
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix NULL pointer dereference during unbind race Commit b81ac4395bbe ("usb: gadget: uvc: allow for application to cleanly shutdown") introduced two stages of synchronization waits totaling 1500ms in uvc_function_unbind() to prevent several types of kernel panics. However, this timing-based approach is insufficient during power management (PM) transitions. When the PM subsystem starts freezing user space processes, the wait_event_interruptible_timeout() is aborted early, which allows the unbind thread to proceed and nullify the gadget pointer (cdev->gadget = NULL): [ 814.123447][ T947] configfs-gadget.g1 gadget.0: uvc: uvc_function_unbind() [ 814.178583][ T3173] PM: suspend entry (deep) [ 814.192487][ T3173] Freezing user space processes [ 814.197668][ T947] configfs-gadget.g1 gadget.0: uvc: uvc_function_unbind no clean disconnect, wait for release When the PM subsystem resumes or aborts the suspend and tasks are restarted, the V4L2 release path is executed and attempts to access the already nullified gadget pointer, triggering a kernel panic: [ 814.292597][ C0] PM: pm_system_irq_wakeup: 479 triggered dhdpcie_host_wake [ 814.386727][ T3173] Restarting tasks ... [ 814.403522][ T4558] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030 [ 814.404021][ T4558] pc : usb_gadget_deactivate+0x14/0xf4 [ 814.404031][ T4558] lr : usb_function_deactivate+0x54/0x94 [ 814.404078][ T4558] Call trace: [ 814.404080][ T4558] usb_gadget_deactivate+0x14/0xf4 [ 814.404083][ T4558] usb_function_deactivate+0x54/0x94 [ 814.404087][ T4558] uvc_function_disconnect+0x1c/0x5c [ 814.404092][ T4558] uvc_v4l2_release+0x44/0xac [ 814.404095][ T4558] v4l2_release+0xcc/0x130 Address the race condition and NULL pointer dereference by: 1. State Synchronization (flag + mutex) Introduce a 'func_unbound' flag in struct uvc_device. This allows uvc_function_disconnect() to safely skip accessing the nullified cdev->gadget pointer. As suggested by Alan Stern, this flag is protected by a new mutex (uvc->lock) to ensure proper memory ordering and prevent instruction reordering or speculative loads. This mutex is also used to protect 'func_connected' for consistent state management. 2. Explicit Synchronization (completion) Use a completion to synchronize uvc_function_unbind() with the uvc_vdev_release() callback. This prevents Use-After-Free (UAF) by ensuring struct uvc_device is freed after all video device resources are released.
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uvc在解绑竞争期间存在空指针取消引用，可能导致内核崩溃。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux 1444e0568bc2c70868e7b8da5b46fc2252acc3f5 ~ 0c00ec409d7b2bce3fcac73188b79a141db7cfda -
Linux Linux 5.18 -

二、漏洞 CVE-2026-31726 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2026-31726 的情报信息

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CVE-2026-31726 补丁与修复 (8)

同批安全公告 · Linux · 2026-05-01 · 共 146 条

CVE-2026-43011 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-43037 9.8 CRITICAL Linux kernel 缓冲区错误漏洞
CVE-2026-31705 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-43038 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-43039 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-31718 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-43018 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31773 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31739 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31735 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31717 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-43048 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31709 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31706 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-31712 8.3 HIGH Linux kernel 安全漏洞
CVE-2026-31771 8.1 HIGH Linux kernel 安全漏洞
CVE-2026-31779 8.1 HIGH Linux kernel 安全漏洞
CVE-2026-43051 8.1 HIGH Linux kernel 安全漏洞
CVE-2026-31708 8.1 HIGH Linux kernel 安全漏洞
CVE-2026-31695 7.8 HIGH Linux kernel 安全漏洞

显示前 20 条，共 146 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31726

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