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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-38000 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() When enqueuing the first packet to an HFSC class, hfsc_enqueue() calls the child qdisc's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. If the child qdisc uses qdisc_peek_dequeued(), this may trigger an immediate dequeue and potential packet drop. In such cases, qdisc_tree_reduce_backlog() is called, but the HFSC qdisc's qlen and backlog have not yet been updated, leading to inconsistent queue accounting. This can leave an empty HFSC class in the active list, causing further consequences like use-after-free. This patch fixes the bug by moving the increment of sch->q.qlen and sch->qstats.backlog before the call to the child qdisc's peek() operation. This ensures that queue length and backlog are always accurate when packet drops or dequeues are triggered during the peek.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1034e3310752e8675e313f7271b348914008719a kernel.org Patch 
https://git.kernel.org/stable/c/3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335 kernel.org Patch 
https://git.kernel.org/stable/c/3f981138109f63232a5fb7165938d4c945cc1b9d kernel.org Patch 
https://git.kernel.org/stable/c/49b21795b8e5654a7df3d910a12e1060da4c04cf kernel.org Patch 
https://git.kernel.org/stable/c/89c301e929a0db14ebd94b4d97764ce1d6981653 kernel.org Patch 
https://git.kernel.org/stable/c/93c276942e75de0e5bc91576300d292e968f5a02 kernel.org Patch 
https://git.kernel.org/stable/c/f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 kernel.org Patch 
https://git.kernel.org/stable/c/f9f593e34d2fb67644372c8f7b033bdc622ad228 kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html CVE Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html CVE Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-38000
NVD Published Date:
06/06/2025
NVD Last Modified:
12/16/2025
Source:
kernel.org