🛡️ AZL-63684 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2025-38000 affecting package kernel for versions less than 6.6.96.1-1

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.

Affected software

AZL-63684 is recorded against 1 package.

  • kernel (fixed in 6.6.96.1-1)

Timeline and source

Published on 6 June 2025 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-06-06
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 6.6.96.1-1

Similar Threats

Free Vulnerability Check

Is your site affected by AZL-63684?

BotEraser helps you identify potentially vulnerable plugins and themes by checking your installation against AZL-63684 and other known CVE records.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.