What is CVE-2025-37954?

CVE-2025-37954 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.5.10 onward and patched in 6.6.91, 6.12.29, 6.14.7 and others. CVE-2025-37954 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-37954?

CVE-2025-37954 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-2025-37954?

Yes, CVE-2025-37954 has been patched. Fixed versions include 6.6.91, 6.12.29, 6.14.7 and others. If you are running Linux kernel 6.5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-37954 actively exploited?

CVE-2025-37954 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-37954

Medium

In the Linux kernel, the following vulnerability has been resolved: smb: client: Avoid race in open_cached_dir with lease breaks A pre-existing valid cfid returned from find_or_create_cached_dir might race with a lease break, meaning open_cached_dir doesn't consider it valid, and thinks it's newly-constructed. This leaks a dentry reference if the allocation occurs before the queued lease break work runs. Avoid the race by extending holding the cfid_list_lock across find_or_create_cached_dir and when the result is checked.

Package Linux Kernel

Published 2025-05-20

Last modified 2025-11-14

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 6.5.10, 6.6 and later are affected. Fixed in 6.6.91, 6.12.29, 6.14.7, 6.15 and their respective stable series.

Affected from

≥ 6.5.10 ≥ 6.6

Fixed in

✓ 6.6.91 6.6.x ✓ 6.12.29 6.12.x ✓ 6.14.7 6.14.x ✓ 6.15

References

The following references provide additional information about CVE-2025-37954 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/2407265dc32bc8cc45b62a612c2a214ba9038e8b
Patch
Kernel patch commit
https://git.kernel.org/stable/c/2ed98e89ebc2e1bc73534dc3c18cb7843a889ff9
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3ca02e63edccb78ef3659bebc68579c7224a6ca2
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-37954

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-05-20

Modified 2025-11-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-37954?

CVE-2025-37954 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.5.10 onward and has been patched in 6.6.91, 6.12.29, 6.14.7 and others. CVE-2025-37954 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-37954?

CVE-2025-37954 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-2025-37954?

Yes — CVE-2025-37954 has been patched. Fixed versions include 6.6.91, 6.12.29, 6.14.7 and others. If you are running Linux kernel 6.5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-37954 actively exploited?

No — CVE-2025-37954 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.