CVE-2025-21701

MEDIUM EPSS 5.4%
Published Feb 13, 20251y ago · Modified Jun 17, 20261w ago
4.7 CVSS 3.1
Medium
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Published Feb 13, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥5.10.87  –  <5.11
linuxlinux_kernel*≥5.15.8  –  <5.15.179
linuxlinux_kernel*≥5.16.1  –  <6.1.129
linuxlinux_kernel*≥6.2  –  <6.6.76
linuxlinux_kernel*≥6.7  –  <6.12.13
linuxlinux_kernel*≥6.13  –  <6.13.2
linuxlinux_kernel5.16any
linuxlinux_kernel5.16any
linuxlinux_kernel5.16any
linuxlinux_kernel5.16any
linuxlinux_kernel5.16any

References 8

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-082556.html
  • git.kernel.org https://git.kernel.org/stable/c/12e070eb6964b341b41677fd260af5a305316a1f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/26bc6076798aa4dc83a07d0a386f9e57c94e8517
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2f29127e94ae9fdc7497331003d6860e9551cdf3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4dc880245f9b529fa8f476b5553c799d2848b47b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1cb37a31a482df3dd35a6ac166282dac47664f4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b382ab9b885cbb665e0e70a727f101c981b4edf3
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/12e070eb6964b341b41677fd260af5a305316a1f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/26bc6076798aa4dc83a07d0a386f9e57c94e8517
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2f29127e94ae9fdc7497331003d6860e9551cdf3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4dc880245f9b529fa8f476b5553c799d2848b47b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1cb37a31a482df3dd35a6ac166282dac47664f4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b382ab9b885cbb665e0e70a727f101c981b4edf3
    Patch