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🛡️ CVE-2025-39947 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net/mlx5e: Harden uplink netdev access against device unbind

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2025-39947 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.16.9)
  • linux-kernel

Timeline and source

Published on 4 October 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-39947 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-10-04
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.16.9
linux-kernel — —

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