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CVE-2025-21701— net: avoid race between device unregistration and ethnl ops

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.8 · High EPSS 0.17% · P6

Affected Version Matrix 17

VendorProduct Version RangeStatus
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 more rows
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I. Basic Information for CVE-2025-21701

Vulnerability Information
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Vulnerability Title
net: avoid race between device unregistration and ethnl ops
Source: 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.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux cfd719f04267108f5f5bf802b9d7de69e99a99f9 ~ 26bc6076798aa4dc83a07d0a386f9e57c94e8517 -
Linux Linux 5.16 -

II. Public POCs for CVE-2025-21701

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III. Intelligence Information for CVE-2025-21701

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Patches & Fixes for CVE-2025-21701 (5)

Other References for CVE-2025-21701 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21701

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