What is CVE-2025-68779?

CVE-2025-68779 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.18 onward and patched in 6.18.3 and 6.19. CVE-2025-68779 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-68779?

CVE-2025-68779 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2025-68779?

Yes, CVE-2025-68779 has been patched. Fixed versions include 6.18.3 and 6.19. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-68779 actively exploited?

CVE-2025-68779 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-68779

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.

Package Linux Kernel

Published 2026-01-13

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 6.18 and later are affected. Fixed in 6.18.3, 6.19 and their respective stable series.

Affected from

≥ 6.18

Fixed in

✓ 6.18.3 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2025-68779 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/35e93736f69963337912594eb3951ab320b77521
Patch
Kernel patch commit
https://git.kernel.org/stable/c/e12c912f92ccea671b514caf371f28485714bb4b
Patch

Frequently asked questions

What is CVE-2025-68779?

CVE-2025-68779 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.3 and 6.19. CVE-2025-68779 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2025-68779?

Yes — CVE-2025-68779 has been patched. Fixed versions include 6.18.3 and 6.19. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-68779 actively exploited?

No — CVE-2025-68779 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.