CVE-2025-21701— 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，该漏洞源于如果在设备通道数被修改时注销设备可以导致竞争条件。
影响版本矩阵 17
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | cfd719f04267108f5f5bf802b9d7de69e99a99f9< 26bc6076798aa4dc83a07d0a386f9e57c94e8517 |
affected |
dde91ccfa25fd58f64c397d91b81a4b393100ffa< b1cb37a31a482df3dd35a6ac166282dac47664f4 |
affected | ||
dde91ccfa25fd58f64c397d91b81a4b393100ffa< 2f29127e94ae9fdc7497331003d6860e9551cdf3 |
affected | ||
dde91ccfa25fd58f64c397d91b81a4b393100ffa< b382ab9b885cbb665e0e70a727f101c981b4edf3 |
affected | ||
dde91ccfa25fd58f64c397d91b81a4b393100ffa< 4dc880245f9b529fa8f476b5553c799d2848b47b |
affected | ||
dde91ccfa25fd58f64c397d91b81a4b393100ffa< 12e070eb6964b341b41677fd260af5a305316a1f |
affected | ||
7c26da3be1e9843a15b5318f90db8a564479d2ac |
affected | ||
5.15.8< 5.15.179 |
affected | ||
| … +9 条更多 | |||
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一、 漏洞 CVE-2025-21701 基础信息
漏洞信息
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Vulnerability Title
net: avoid race between device unregistration and ethnl ops
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: avoid race between device unregistration and ethnl ops
The following trace can be seen if a device is being unregistered while
its number of channels are being modified.
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 3 PID: 3754 at kernel/locking/mutex.c:564 __mutex_lock+0xc8a/0x1120
CPU: 3 UID: 0 PID: 3754 Comm: ethtool Not tainted 6.13.0-rc6+ #771
RIP: 0010:__mutex_lock+0xc8a/0x1120
Call Trace:
<TASK>
ethtool_check_max_channel+0x1ea/0x880
ethnl_set_channels+0x3c3/0xb10
ethnl_default_set_doit+0x306/0x650
genl_family_rcv_msg_doit+0x1e3/0x2c0
genl_rcv_msg+0x432/0x6f0
netlink_rcv_skb+0x13d/0x3b0
genl_rcv+0x28/0x40
netlink_unicast+0x42e/0x720
netlink_sendmsg+0x765/0xc20
__sys_sendto+0x3ac/0x420
__x64_sys_sendto+0xe0/0x1c0
do_syscall_64+0x95/0x180
entry_SYSCALL_64_after_hwframe+0x76/0x7e
This is because unregister_netdevice_many_notify might run before the
rtnl lock section of ethnl operations, eg. set_channels in the above
example. In this example the rss lock would be destroyed by the device
unregistration path before being used again, but in general running
ethnl operations while dismantle has started is not a good idea.
Fix this by denying any operation on devices being unregistered. A check
was already there in ethnl_ops_begin, but not wide enough.
Note that the same issue cannot be seen on the ioctl version
(__dev_ethtool) because the device reference is retrieved from within
the rtnl lock section there. Once dismantle started, the net device is
unlisted and no reference will be found.
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，该漏洞源于如果在设备通道数被修改时注销设备可以导致竞争条件。
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-2025-21701 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21701 补丁与修复 (5)
CVE-2025-21701 其他参考 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2025-21701
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