Medium 5.5Published Oct 4, 2025

CVE-2025-39947net/mlx5e: Harden uplink netdev access against device unbind

Updated under an hour ago (Oct 27, 2026, 9:50 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Harden uplink netdev access against device unbind The function mlx5_uplink_netdev_get() gets the uplink netdevice pointer from mdev->mlx5e_res.uplink_netdev. However, the netdevice can be removed and its pointer cleared when unbound from the mlx5_core.eth driver. This results in a NULL pointer, causing a kernel panic. BUG: unable to handle page fault for address: 0000000000001300 at RIP: 0010:mlx5e_vport_rep_load+0x22a/0x270 [mlx5_core] Call Trace: <TASK> mlx5_esw_offloads_rep_load+0x68/0xe0 [mlx5_core] esw_offloads_enable+0x593/0x910 [mlx5_core] mlx5_eswitch_enable_locked+0x341/0x420 [mlx5_core] mlx5_devlink_eswitch_mode_set+0x17e/0x3a0 [mlx5_core] devlink_nl_eswitch_set_doit+0x60/0xd0 genl_family_rcv_msg_doit+0xe0/0x130 genl_rcv_msg+0x183/0x290 netlink_rcv_skb+0x4b/0xf0 genl_rcv+0x24/0x40 netlink_unicast+0x255/0x380 netlink_sendmsg+0x1f3/0x420 __sock_sendmsg+0x38/0x60 __sys_sendto+0x119/0x180 do_syscall_64+0x53/0x1d0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Ensure the pointer is valid before use by checking it for NULL. If it is valid, immediately call netdev_hold() to take a reference, and preventing the netdevice from being freed while it is in use.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	7a9fb35e8c3a67145fca262c304de65cb2f83abf builds before 2cb17c88edd3a1c7aa6bc880dcdb35a6866fcb2e; from 7a9fb35e8c3a67145fca262c304de65cb2f83abf before d1f3db4e7a3be29fc17f01850f162363f919370d; from 7a9fb35e8c3a67145fca262c304de65cb2f83abf before 8df354eb2dd63d111ed5ae2e956e0dbb22bcf93b; 7a9fb35e8c3a67145fca262c304de65cb2f83abf builds before 6b4be64fd9fec16418f365c2d8e47a7566e9eba5	CNA record
linux linux_kernel linux:linux_kernel	from 5.13 before 6.6.108; from 6.7 before 6.12.49; from 6.13 before 6.16.9; 6.17; 6.17; 6.17; 6.17; 6.17; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/2cb17c88edd3a1c7aa6bc880dcdb35a6866fcb2e	patch
https://git.kernel.org/stable/c/d1f3db4e7a3be29fc17f01850f162363f919370d	patch
https://git.kernel.org/stable/c/8df354eb2dd63d111ed5ae2e956e0dbb22bcf93b	patch
https://git.kernel.org/stable/c/6b4be64fd9fec16418f365c2d8e47a7566e9eba5	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.