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🛡️ CVE-2025-37992 — debian-linux

🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-476 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net_sched: Flush gso_skb list too during ->change()

In the Linux kernel, the following vulnerability has been resolved:

net_sched: Flush gso_skb list too during ->change()

Previously, when reducing a qdisc's limit via the ->change() operation, only

the main skb queue was trimmed, potentially leaving packets in the gso_skb

list. This could result in NULL pointer dereference when we only check

sch->limit against sch->q.qlen.

This patch introduces a new helper, qdisc_dequeue_internal(), which ensures

both the gso_skb list and the main queue are properly flushed when trimming

excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie)

are updated to use this helper in their ->change() routines.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2025-37992 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2025-37992 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.13.0 up to 6.14.8)
  • linux-kernel

Timeline and source

Published on 26 May 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org
lists.debian.org

Other advisories for this package

debian-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-476: NULL Pointer Dereference) in other software:

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ✅ No
Source NVD
Published 2025-05-26
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.13.0 6.14.8
linux-kernel — —

Similar Threats

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