---
cve: "CVE-2025-68779"
severity: "LOW"
cvss: 3.1
epss: "16%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-01-13 16:15:57"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T22:05:05+02:00"
---

# CVE-2025-68779

> 3.1 LOW

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Avoid unregistering PSP twice

PSP is unregistered twice in:
_mlx5e_remove -> mlx5e_psp_unregister
mlx5e_nic_cleanup -> mlx5e_psp_unregister

This leads to a refcount underflow in some conditions:
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 2 PID: 1694 at lib/refcount.c:28 refcount_warn_saturate+0xd8/0xe0
[...]
 mlx5e_psp_unregister+0x26/0x50 [mlx5_core]
 mlx5e_nic_cleanup+0x26/0x90 [mlx5_core]
 mlx5e_remove+0xe6/0x1f0 [mlx5_core]
 auxiliary_bus_remove+0x18/0x30
 device_release_driver_internal+0x194/0x1f0
 bus_remove_device+0xc6/0x130
 device_del+0x159/0x3c0
 mlx5_rescan_drivers_locked+0xbc/0x2a0 [mlx5_core]
[...]

Do not directly remove psp from the _mlx5e_remove path, the PSP cleanup
happens as part of profile cleanup.

## Patch verfügbar (OSV)

- Kernel ≥ 6.18.3

## Referenzen

- <https://git.kernel.org/stable/c/e12c912f92ccea671b514caf371f28485714bb4b>
- <https://git.kernel.org/stable/c/35e93736f69963337912594eb3951ab320b77521>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-68779) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_