What is CVE-2025-40201?

CVE-2025-40201 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 5.18 onward and patched in 6.1.157, 6.6.113, 6.12.54 and others. CVE-2025-40201 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40201?

CVE-2025-40201 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-40201?

Yes, CVE-2025-40201 has been patched. Fixed versions include 6.1.157, 6.6.113, 6.12.54 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-2025-40201 actively exploited?

CVE-2025-40201 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40201

High

In the Linux kernel, the following vulnerability has been resolved: kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths The usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit() path is very broken. sys_prlimit64() does get_task_struct(tsk) but this only protects task_struct itself. If tsk != current and tsk is not a leader, this process can exit/exec and task_lock(tsk->group_leader) may use the already freed task_struct. Another problem is that sys_prlimit64() can race with mt-exec which changes ->group_leader. In this case do_prlimit() may take the wrong lock, or (worse) ->group_leader may change between task_lock() and task_unlock(). Change sys_prlimit64() to take tasklist_lock when necessary. This is not nice, but I don't see a better fix for -stable.

Package Linux Kernel

Published 2025-11-12

Last modified 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.18 and later are affected. Fixed in 6.1.157, 6.6.113, 6.12.54, 6.17.4, 6.18 and their respective stable series.

Affected from

≥ 5.18

Fixed in

✓ 6.1.157 6.1.x ✓ 6.6.113 6.6.x ✓ 6.12.54 6.12.x ✓ 6.17.4 6.17.x ✓ 6.18

References

5 total

Details

CVE ID CVE-2025-40201

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-11-12

Modified 2026-07-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-40201?

CVE-2025-40201 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 5.18 onward and has been patched in 6.1.157, 6.6.113, 6.12.54 and others. CVE-2025-40201 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-40201?

CVE-2025-40201 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-40201?

Yes. CVE-2025-40201 has been patched. Fixed versions include 6.1.157, 6.6.113, 6.12.54 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-2025-40201 actively exploited?

No. CVE-2025-40201 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.