What is CVE-2025-40301?

CVE-2025-40301 is a High severity Linux kernel vulnerability with a CVSS score of 7.6 out of 10, affecting Linux kernel versions from 6.1 onward and patched in 6.1.159, 6.6.117, 6.12.58 and others. CVE-2025-40301 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40301?

CVE-2025-40301 has a CVSS score of 7.6 out of 10, rated High severity. The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.

Is there a patch available for CVE-2025-40301?

Yes, CVE-2025-40301 has been patched. Fixed versions include 6.1.159, 6.6.117, 6.12.58 and others. If you are running Linux kernel 6.1 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40301 actively exploited?

CVE-2025-40301 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40301

High

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: validate skb length for unknown CC opcode In hci_cmd_complete_evt(), if the command complete event has an unknown opcode, we assume the first byte of the remaining skb->data contains the return status. However, parameter data has previously been pulled in hci_event_func(), which may leave the skb empty. If so, using skb->data[0] for the return status uses un-init memory. The fix is to check skb->len before using skb->data.

Package Linux Kernel

Published 2025-12-08

Last modified 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.6

out of 10

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.1 and later are affected. Fixed in 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18 and their respective stable series.

Affected from

≥ 6.1

Fixed in

✓ 6.1.159 6.1.x ✓ 6.6.117 6.6.x ✓ 6.12.58 6.12.x ✓ 6.17.8 6.17.x ✓ 6.18

References

5 total

Details

CVE ID CVE-2025-40301

Severity High

CVSS score 7.6 / 10

CVSS version 3.1

Published 2025-12-08

Modified 2026-07-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-40301?

CVE-2025-40301 is a High severity Linux kernel vulnerability with a CVSS score of 7.6 out of 10 . It affects Linux kernel versions from 6.1 onward and has been patched in 6.1.159, 6.6.117, 6.12.58 and others. CVE-2025-40301 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-40301?

CVE-2025-40301 has a CVSS score of 7.6 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.
Is there a patch available for CVE-2025-40301?

Yes. CVE-2025-40301 has been patched. Fixed versions include 6.1.159, 6.6.117, 6.12.58 and others. If you are running Linux kernel 6.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40301 actively exploited?

No. CVE-2025-40301 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.