CVE-2025-37992

Local system crash via incomplete qdisc trimming

Published May 26, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux kernel net_sched qdisc handlers allows local users to crash the system by reducing a queue limit. When a qdisc limit shrinks, the change handlers trim only the main skb queue while packets remain on gso_skb, so a limit-versus-qlen check permits a NULL dequeue. A low-privileged local user must be able to change a codel, fq, fq_codel, fq_pie, hhf, or pie qdisc; successful triggering interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel net_sched qdisc handlers allows local users to crash the system by reducing a queue limit. When a qdisc limit shrinks, the change handlers trim only the main skb queue while packets remain on gso_skb, so a limit-versus-qlen check permits a NULL dequeue. A low-privileged local user must be able to change a codel, fq, fq_codel, fq_pie, hhf, or pie qdisc; successful triggering interrupts the host.

The record

CVE
CVE-2025-37992
Published
May 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.5
  2. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
  3. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <a7d6e0ac0a8861f6b1027488062251a8e28150fd
  4. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <d1365ca80b012d8a7863e45949e413fb61fa4861
  5. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <d3336f746f196c6a53e0480923ae93939f047b6c
  6. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <d38939ebe0d992d581acb6885c1723fa83c1fb2c
  7. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <ea1132ccb112f51ba749c56a912f67970c2cd542
  8. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <a7d6e0ac0a8861f6b1027488062251a8e28150fd; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <d1365ca80b012d8a7863e45949e413fb61fa4861; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <d3336f746f196c6a53e0480923ae93939f047b6c; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <d38939ebe0d992d581acb6885c1723fa83c1fb2c; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <ea1132ccb112f51ba749c56a912f67970c2cd542; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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