Riskcovery

CVE-2025-39947

net/mlx5e: Harden uplink netdev access against device unbind

State
Published
Severity
Not scored
Published
Oct 4, 2025
Updated
May 11, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 7a9fb35e8c3a67145fca262c304de65cb2f83abf to before 2cb17c88edd3a1c7aa6bc880dcdb35a6866fcb2eAffected
  • 7a9fb35e8c3a67145fca262c304de65cb2f83abf to before d1f3db4e7a3be29fc17f01850f162363f919370dAffected
  • 7a9fb35e8c3a67145fca262c304de65cb2f83abf to before 8df354eb2dd63d111ed5ae2e956e0dbb22bcf93bAffected
  • 7a9fb35e8c3a67145fca262c304de65cb2f83abf to before 6b4be64fd9fec16418f365c2d8e47a7566e9eba5Affected
LinuxLinux
  • 5.13Affected
  • before 5.13Not affected
  • 6.6.108 through 6.6.*Not affected
  • 6.12.49 through 6.12.*Not affected
  • 6.16.9 through 6.16.*Not affected
  • 6.17 and laterNot affected

References

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