CVE-2021-47436— 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，该漏洞源于空指针取消引用而导致内核崩溃。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 13
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 5269937d1483d3159d5b51907346e4f4b13ef079< 5ed60a430fb5f3d93e7fef66264daef466b4d10c |
affected |
ffc825049ed2e8c849d318e987fd5073e0be462f< e923bce31ffefe4f60edfc6b84f62d4a858f3676 |
affected | ||
9a4a6805294fa7d2653e82972bdaf9e3e1f3d3c9< 9ab5d539bc975b8dcde86eca1b58d836b657732e |
affected | ||
8de01a896c1bc14b6b65b8d26013626597a45eda< 9d89e287116796bf987cc48f5c8632ef3048f8eb |
affected | ||
72bb3eafcfdd156713a3ea0c9c95d536bd6e6e55< ff9249aab39820be11b6975a10d94253b7d426fc |
affected | ||
7c75bde329d7e2a93cf86a5c15c61f96f1446cdc< c2115b2b16421d93d4993f3fe4c520e91d6fe801 |
affected | ||
f5b4df24b4209cc3b9ccc768897415be18807e46 |
affected | ||
5.13.19< 5.14 |
affected | ||
| … +5 条更多 | |||
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一、 漏洞 CVE-2021-47436 基础信息
漏洞信息
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Vulnerability Title
usb: musb: dsps: Fix the probe error path
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
usb: musb: dsps: Fix the probe error path
Commit 7c75bde329d7 ("usb: musb: musb_dsps: request_irq() after
initializing musb") has inverted the calls to
dsps_setup_optional_vbus_irq() and dsps_create_musb_pdev() without
updating correctly the error path. dsps_create_musb_pdev() allocates and
registers a new platform device which must be unregistered and freed
with platform_device_unregister(), and this is missing upon
dsps_setup_optional_vbus_irq() error.
While on the master branch it seems not to trigger any issue, I observed
a kernel crash because of a NULL pointer dereference with a v5.10.70
stable kernel where the patch mentioned above was backported. With this
kernel version, -EPROBE_DEFER is returned the first time
dsps_setup_optional_vbus_irq() is called which triggers the probe to
error out without unregistering the platform device. Unfortunately, on
the Beagle Bone Black Wireless, the platform device still living in the
system is being used by the USB Ethernet gadget driver, which during the
boot phase triggers the crash.
My limited knowledge of the musb world prevents me to revert this commit
which was sent to silence a robot warning which, as far as I understand,
does not make sense. The goal of this patch was to prevent an IRQ to
fire before the platform device being registered. I think this cannot
ever happen due to the fact that enabling the interrupts is done by the
->enable() callback of the platform musb device, and this platform
device must be already registered in order for the core or any other
user to use this callback.
Hence, I decided to fix the error path, which might prevent future
errors on mainline kernels while also fixing older ones.
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，该漏洞源于空指针取消引用而导致内核崩溃。
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
二、漏洞 CVE-2021-47436 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-47436 补丁与修复 (1)
CVE-2021-47436 其他参考 (5)
同批安全公告 · Linux · 2024-05-22 · 共 63 条
| CVE-2021-47496 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47478 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47450 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47433 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47446 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47494 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47493 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47492 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47459 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47447 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47451 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47485 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47483 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47461 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47448 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47438 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47465 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47458 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47479 | Linux kernel 安全漏洞 | |
| CVE-2024-36010 | Linux kernel 安全漏洞 |
显示前 20 条，共 63 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47436
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