CVE-2022-50220— 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usbnet在断开连接时使用已释放的linkwatch，可能导致释放后重用。
可能的 ATT&CK 技术 1 AI
T1205.002 · Socket Filters影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 23f333a2bfafba80339315b724808982a9de57d9< d2d6b530d89b0a912148018027386aa049f0a309 |
affected |
23f333a2bfafba80339315b724808982a9de57d9< e2a521a7dcc463c5017b4426ca0804e151faeff7 |
affected | ||
23f333a2bfafba80339315b724808982a9de57d9< 7f77dcbc030c2faa6d8e8a594985eeb34018409e |
affected | ||
23f333a2bfafba80339315b724808982a9de57d9< 8b4588b8b00b299be16a35be67b331d8fdba03f3 |
affected | ||
23f333a2bfafba80339315b724808982a9de57d9< 135199a2edd459d2b123144efcd7f9bcd95128e4 |
affected | ||
23f333a2bfafba80339315b724808982a9de57d9< 635fd8953e4309b54ca6a81bed1d4a87668694f4 |
affected | ||
23f333a2bfafba80339315b724808982a9de57d9< d49bb8cf9bfaa06aa527eb30f1a52a071da2e32f |
affected | ||
23f333a2bfafba80339315b724808982a9de57d9< db3b738ae5f726204876f4303c49cfdf4311403f |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2022-50220 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
usbnet: Fix linkwatch use-after-free on disconnect
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
usbnet: Fix linkwatch use-after-free on disconnect
usbnet uses the work usbnet_deferred_kevent() to perform tasks which may
sleep. On disconnect, completion of the work was originally awaited in
->ndo_stop(). But in 2003, that was moved to ->disconnect() by historic
commit "[PATCH] USB: usbnet, prevent exotic rtnl deadlock":
https://git.kernel.org/tglx/history/c/0f138bbfd83c
The change was made because back then, the kernel's workqueue
implementation did not allow waiting for a single work. One had to wait
for completion of *all* work by calling flush_scheduled_work(), and that
could deadlock when waiting for usbnet_deferred_kevent() with rtnl_mutex
held in ->ndo_stop().
The commit solved one problem but created another: It causes a
use-after-free in USB Ethernet drivers aqc111.c, asix_devices.c,
ax88179_178a.c, ch9200.c and smsc75xx.c:
* If the drivers receive a link change interrupt immediately before
disconnect, they raise EVENT_LINK_RESET in their (non-sleepable)
->status() callback and schedule usbnet_deferred_kevent().
* usbnet_deferred_kevent() invokes the driver's ->link_reset() callback,
which calls netif_carrier_{on,off}().
* That in turn schedules the work linkwatch_event().
Because usbnet_deferred_kevent() is awaited after unregister_netdev(),
netif_carrier_{on,off}() may operate on an unregistered netdev and
linkwatch_event() may run after free_netdev(), causing a use-after-free.
In 2010, usbnet was changed to only wait for a single instance of
usbnet_deferred_kevent() instead of *all* work by commit 23f333a2bfaf
("drivers/net: don't use flush_scheduled_work()").
Unfortunately the commit neglected to move the wait back to
->ndo_stop(). Rectify that omission at long last.
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usbnet在断开连接时使用已释放的linkwatch，可能导致释放后重用。
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-2022-50220 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-50220 补丁与修复 (1)
同批安全公告 · Linux · 2025-06-18 · 共 362 条
| CVE-2025-38075 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-50098 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38052 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49934 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50164 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38016 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38074 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49974 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49968 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49944 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49950 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49939 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50028 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49935 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38082 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38080 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38079 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38060 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50101 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38062 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 362 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2022-50220
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