CVE-2021-46986— 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。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0< 1ea775021282d90e1d08d696b7ab54aa75d688e5 |
affected |
e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0< bc0cdd72493236fb72b390ad38ce581e353c143c |
affected | ||
e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0< b4b8e9601d7ee8806d2687f081a42485d27674a1 |
affected | ||
e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0< bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139 |
affected | ||
5.10 |
affected | ||
< 5.10 |
unaffected | ||
5.10.38≤ 5.10.* |
unaffected | ||
5.11.22≤ 5.11.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2021-46986 基础信息
漏洞信息
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Vulnerability Title
usb: dwc3: gadget: Free gadget structure only after freeing endpoints
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
usb: dwc3: gadget: Free gadget structure only after freeing endpoints
As part of commit e81a7018d93a ("usb: dwc3: allocate gadget structure
dynamically") the dwc3_gadget_release() was added which will free
the dwc->gadget structure upon the device's removal when
usb_del_gadget_udc() is called in dwc3_gadget_exit().
However, simply freeing the gadget results a dangling pointer
situation: the endpoints created in dwc3_gadget_init_endpoints()
have their dep->endpoint.ep_list members chained off the list_head
anchored at dwc->gadget->ep_list. Thus when dwc->gadget is freed,
the first dwc3_ep in the list now has a dangling prev pointer and
likewise for the next pointer of the dwc3_ep at the tail of the list.
The dwc3_gadget_free_endpoints() that follows will result in a
use-after-free when it calls list_del().
This was caught by enabling KASAN and performing a driver unbind.
The recent commit 568262bf5492 ("usb: dwc3: core: Add shutdown
callback for dwc3") also exposes this as a panic during shutdown.
There are a few possibilities to fix this. One could be to perform
a list_del() of the gadget->ep_list itself which removes it from
the rest of the dwc3_ep chain.
Another approach is what this patch does, by splitting up the
usb_del_gadget_udc() call into its separate "del" and "put"
components. This allows dwc3_gadget_free_endpoints() to be
called before the gadget is finally freed with usb_put_gadget().
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。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
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-2021-46986 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-46986 其他参考 (3)
同批安全公告 · Linux · 2024-02-28 · 共 86 条
| CVE-2021-47013 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47036 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-46999 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47035 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47017 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47049 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47014 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2020-36785 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47040 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47048 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-46984 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-46993 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-46998 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-46992 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-46977 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47012 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47011 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2020-36787 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47041 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-46983 | 7.5 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 86 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-46986
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