CVE-2025-38637
Linux Kernel Net-Sched TBF Skbprio Queue Counter Vulnerability (Denial of Service)
Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: skbprio: Remove overly strict queue assertions In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable. This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion. The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all.
INFO
Published Date :
April 18, 2025, 7:15 a.m.
Last Modified :
April 21, 2025, 2:23 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
Public PoC/Exploit Available at Github
CVE-2025-38637 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2025-38637.
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).
DSA and DLA for Debian last 14 days
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-38637 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-38637 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.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 18, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: net_sched: skbprio: Remove overly strict queue assertions In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable. This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion. The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all. Added Reference https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50 Added Reference https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8 Added Reference https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85 Added Reference https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380 Added Reference https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca Added Reference https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919 Added Reference https://git.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160e Added Reference https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc Added Reference https://git.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38637 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-2025-38637
weaknesses.