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5.5
MEDIUM CVSS 3.1
CVE-2025-38193
net_sched: sch_sfq: reject invalid perturb period
Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0

INFO

Published Date :

July 4, 2025, 2:15 p.m.

Last Modified :

Dec. 18, 2025, 9:25 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-38193 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
Apply Linux kernel patches to address the SFQ perturb period race condition.
  • Update the Linux kernel to the latest version.
  • Apply relevant security patches for net_sched.
  • Ensure SFQ perturb period has range checks.
  • Test system stability after 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-2025-38193.

URL Resource
https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3 Patch
https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5 Patch
https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295 Patch
https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8 Patch
https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1 Patch
https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b Patch
https://git.kernel.org/stable/c/e0936ff56be4e08ad5b60ec26971eae0c40af305 Patch
https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.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-2025-38193 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-2025-38193 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-2025-38193 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-2025-38193 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. 18, 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 CWE-190
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.186 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.142 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.95 *cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.15.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.35 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.240 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.13 up to (excluding) 5.4.297
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e0936ff56be4e08ad5b60ec26971eae0c40af305 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82 Types: Patch
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Types: Third Party Advisory
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.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/2025/10/msg00007.html
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00008.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/e0936ff56be4e08ad5b60ec26971eae0c40af305
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 17, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
    Added Reference https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3
    Added Reference https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295
    Added Reference https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8
    Added Reference https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1
    Added Reference https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b
    Added Reference https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82
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