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5.5
MEDIUM CVSS 3.1
CVE-2025-37932
sch_htb: make htb_qlen_notify() idempotent
Description

In the Linux kernel, the following vulnerability has been resolved: sch_htb: make htb_qlen_notify() idempotent htb_qlen_notify() always deactivates the HTB class and in fact could trigger a warning if it is already deactivated. Therefore, it is not idempotent and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life.

INFO

Published Date :

May 20, 2025, 4:15 p.m.

Last Modified :

Dec. 19, 2025, 5:34 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-37932 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
1 Debian debian_linux
: Total Affected Vendor : 2 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update the Linux kernel to resolve an issue with htb_qlen_notify idempotency.
  • Update the Linux kernel to the latest version.
  • Apply the provided patch for sch_htb.
  • Reboot the system after applying updates.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-37932.

URL Resource
https://git.kernel.org/stable/c/0a188c0e197383683fd093ab1ea6ce9a5869a6ea Patch
https://git.kernel.org/stable/c/32ae12ce6a9f6bace186ca7335220ff59b6cc3cd Patch
https://git.kernel.org/stable/c/5ba8b837b522d7051ef81bacf3d95383ff8edce5 Patch
https://git.kernel.org/stable/c/73cf6af13153d62f9b76eff422eea79dbc70f15e Patch
https://git.kernel.org/stable/c/967955c9e57f8eebfccc298037d4aaf3d42bc1c9 Patch
https://git.kernel.org/stable/c/a61f1b5921761fbaf166231418bc1db301e5bf59 Patch
https://git.kernel.org/stable/c/bbbf5e0f87078b715e7a665d662a2c0e77f044ae Patch
https://git.kernel.org/stable/c/e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1 Patch
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-37932 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-37932 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-37932 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-37932 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 19, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.138 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.90 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.190 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.241 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.294 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.14.6 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.28
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/0a188c0e197383683fd093ab1ea6ce9a5869a6ea Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/32ae12ce6a9f6bace186ca7335220ff59b6cc3cd Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5ba8b837b522d7051ef81bacf3d95383ff8edce5 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/73cf6af13153d62f9b76eff422eea79dbc70f15e Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/967955c9e57f8eebfccc298037d4aaf3d42bc1c9 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a61f1b5921761fbaf166231418bc1db301e5bf59 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/bbbf5e0f87078b715e7a665d662a2c0e77f044ae Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1 Types: Patch
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html Types: Third Party Advisory
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Types: Third Party Advisory
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 28, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/32ae12ce6a9f6bace186ca7335220ff59b6cc3cd
    Added Reference https://git.kernel.org/stable/c/967955c9e57f8eebfccc298037d4aaf3d42bc1c9
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 04, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 20, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: sch_htb: make htb_qlen_notify() idempotent htb_qlen_notify() always deactivates the HTB class and in fact could trigger a warning if it is already deactivated. Therefore, it is not idempotent and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life.
    Added Reference https://git.kernel.org/stable/c/0a188c0e197383683fd093ab1ea6ce9a5869a6ea
    Added Reference https://git.kernel.org/stable/c/5ba8b837b522d7051ef81bacf3d95383ff8edce5
    Added Reference https://git.kernel.org/stable/c/73cf6af13153d62f9b76eff422eea79dbc70f15e
    Added Reference https://git.kernel.org/stable/c/a61f1b5921761fbaf166231418bc1db301e5bf59
    Added Reference https://git.kernel.org/stable/c/bbbf5e0f87078b715e7a665d662a2c0e77f044ae
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact