What is CVE-2025-37890?

CVE-2025-37890 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 5.0 onward and patched in 5.4.294, 5.10.238, 5.15.182 and others. CVE-2025-37890 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-37890?

CVE-2025-37890 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-2025-37890?

Yes, CVE-2025-37890 has been patched. Fixed versions include 5.4.294, 5.10.238, 5.15.182 and others. If you are running Linux kernel 5.0 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-37890 actively exploited?

CVE-2025-37890 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2025-37890

High

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case). This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

Package Linux Kernel

Published 2025-05-16

Last modified 2025-11-17

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

Weakness type

CWE-416

CVE-2025-37890 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.0 and later are affected. Fixed in 5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 and their respective stable series.

Affected from

≥ 5.0

Fixed in

✓ 5.4.294 5.4.x ✓ 5.10.238 5.10.x ✓ 5.15.182 5.15.x ✓ 6.1.138 6.1.x ✓ 6.6.90 6.6.x ✓ 6.12.28 6.12.x ✓ 6.14.6 6.14.x ✓ 6.15

References

10 total

Kernel Git
https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547

Patch
Kernel Git
https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421

Patch
Kernel Git
https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202

Patch
Kernel Git
https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21

Patch
Kernel Git
https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef

Patch

Showing 5 of 10 references View all on NVD

Details

CVE ID CVE-2025-37890

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-05-16

Modified 2025-11-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-37890?

CVE-2025-37890 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 5.0 onward and has been patched in 5.4.294, 5.10.238, 5.15.182 and others. CVE-2025-37890 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-37890?

CVE-2025-37890 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-2025-37890?

Yes. CVE-2025-37890 has been patched. Fixed versions include 5.4.294, 5.10.238, 5.15.182 and others. If you are running Linux kernel 5.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-37890 actively exploited?

No. CVE-2025-37890 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.