CVE-2025-21701 Affecting reiserfs-kmp-default package, versions <6.4.0-150600.23.47.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SLES156-REISERFSKMPDEFAULT-9682134
- published10 Apr 2025
- disclosed9 Apr 2025
Introduced: 9 Apr 2025
NewCVE-2025-21701 (opens in a new tab)How to fix?
Upgrade SLES:15.6 reiserfs-kmp-default to version 6.4.0-150600.23.47.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream reiserfs-kmp-default package and not the reiserfs-kmp-default package as distributed by SLES.
See How to fix? for SLES:15.6 relevant fixed versions and status.
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.
References
- https://www.suse.com/security/cve/CVE-2025-21701.html
- https://bugzilla.suse.com/1237164
- https://git.kernel.org/stable/c/12e070eb6964b341b41677fd260af5a305316a1f
- https://git.kernel.org/stable/c/2f29127e94ae9fdc7497331003d6860e9551cdf3
- https://git.kernel.org/stable/c/4dc880245f9b529fa8f476b5553c799d2848b47b
- https://git.kernel.org/stable/c/b382ab9b885cbb665e0e70a727f101c981b4edf3
- https://git.kernel.org/stable/c/b1cb37a31a482df3dd35a6ac166282dac47664f4
- https://git.kernel.org/stable/c/26bc6076798aa4dc83a07d0a386f9e57c94e8517