What is CVE-2025-39805?

CVE-2025-39805 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.18 onward and patched in 6.1.159, 6.6.119, 6.12.45 and others. CVE-2025-39805 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39805?

CVE-2025-39805 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-39805?

Yes, CVE-2025-39805 has been patched. Fixed versions include 6.1.159, 6.6.119, 6.12.45 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39805 actively exploited?

CVE-2025-39805 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39805

Medium

In the Linux kernel, the following vulnerability has been resolved: net: macb: fix unregister_netdev call order in macb_remove() When removing a macb device, the driver calls phy_exit() before unregister_netdev(). This leads to a WARN from kernfs: ------------[ cut here ]------------ kernfs: can not remove 'attached_dev', no directory WARNING: CPU: 1 PID: 27146 at fs/kernfs/dir.c:1683 Call trace: kernfs_remove_by_name_ns+0xd8/0xf0 sysfs_remove_link+0x24/0x58 phy_detach+0x5c/0x168 phy_disconnect+0x4c/0x70 phylink_disconnect_phy+0x6c/0xc0 [phylink] macb_close+0x6c/0x170 [macb] ... macb_remove+0x60/0x168 [macb] platform_remove+0x5c/0x80 ... The warning happens because the PHY is being exited while the netdev is still registered. The correct order is to unregister the netdev before shutting down the PHY and cleaning up the MDIO bus. Fix this by moving unregister_netdev() ahead of phy_exit() in macb_remove().

Package Linux Kernel

Published 2025-09-16

Last modified 2025-12-06

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 5.18 and later are affected. Fixed in 6.1.159, 6.6.119, 6.12.45, 6.16.5, 6.17 and their respective stable series.

Affected from

≥ 5.18

Fixed in

✓ 6.1.159 6.1.x ✓ 6.6.119 6.6.x ✓ 6.12.45 6.12.x ✓ 6.16.5 6.16.x ✓ 6.17

References

5 total

Kernel Git
https://git.kernel.org/stable/c/01b9128c5db1b470575d07b05b67ffa3cb02ebf1

Patch
Kernel Git
https://git.kernel.org/stable/c/775fe690fd4a3337ad2115de2adb41b227d4dae7

Patch
Kernel Git
https://git.kernel.org/stable/c/ff0d3bad32108b57265e5b48f15327549af771d3

Patch
Kernel Git
https://git.kernel.org/stable/c/2b9719ccad38dffad7dbdd2f39896f723f9b9011
Kernel Git
https://git.kernel.org/stable/c/7351782f2fc8ac31ced52e3d4e6fa120f819a7ab

Details

CVE ID CVE-2025-39805

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-09-16

Modified 2025-12-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39805?

CVE-2025-39805 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.18 onward and has been patched in 6.1.159, 6.6.119, 6.12.45 and others. CVE-2025-39805 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39805?

CVE-2025-39805 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-39805?

Yes. CVE-2025-39805 has been patched. Fixed versions include 6.1.159, 6.6.119, 6.12.45 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39805 actively exploited?

No. CVE-2025-39805 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.