CVE-2025-38177

Medium

In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.

Package Linux Kernel
Published 2025-07-04
Last modified 2025-12-18
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

Weakness type

CWE-459

CVE-2025-38177 is classified as CWE-459

See CWE-459 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.14 and later are affected. Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 and their respective stable series.

Affected from
≥ 4.14
Fixed in
✓ 5.4.297 5.4.x ✓ 5.10.241 5.10.x ✓ 5.15.190 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

The following references provide additional information about CVE-2025-38177 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

8 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2025-38177?

    CVE-2025-38177 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.14 onward and has been patched in 5.4.297, 5.10.241, 5.15.190 and others. CVE-2025-38177 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-38177?

    CVE-2025-38177 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-2025-38177?

    Yes — CVE-2025-38177 has been patched. Fixed versions include 5.4.297, 5.10.241, 5.15.190 and others. If you are running Linux kernel 4.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-38177 actively exploited?

    No — CVE-2025-38177 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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