CVE-2025-37798

Local privilege escalation via stale qdisc class

Published May 2, 2025 · Updated Aug 5, 2026

Use-after-free in the CoDel schedulers in Linux allows local users to gain kernel privileges through crafted qdisc operations. The qlen check in fq_codel_dequeue() and codel_qdisc_dequeue() suppresses backlog reduction at zero, leaving a deleted class linked in parent scheduler structures. A local user can obtain CAP_NET_ADMIN in a user and network namespace, construct the persistent state, and reclaim the dangling object for kernel reads, writes, control-flow hijacking, or a repeatable panic.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the CoDel schedulers in Linux allows local users to gain kernel privileges through crafted qdisc operations. The qlen check in fq_codel_dequeue() and codel_qdisc_dequeue() suppresses backlog reduction at zero, leaving a deleted class linked in parent scheduler structures. A local user can obtain CAP_NET_ADMIN in a user and network namespace, construct the persistent state, and reclaim the dangling object for kernel reads, writes, control-flow hijacking, or a repeatable panic.

The record

CVE
CVE-2025-37798
Published
May 2, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 <2f9761a94bae33d26e6a81b31b36e7d776d93dc1
  3. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <342debc12183b51773b3345ba267e9263bdfaaef
  4. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <4d55144b12e742404bb3f8fee6038bafbf45619d
  5. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <7a742a9506849d1c1aa71e36c89855ceddc7d58e
  6. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <829c49b6b2ff45b043739168fd1245e4e1a91a30
  7. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31
  8. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <cc71a757da78dd4aa1b4a9b19cb011833730ccf2
  9. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <e73c838c80dccb9e4f19becc11d9f3cb4a27d483
  10. Affected versionversion=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <2f9761a94bae33d26e6a81b31b36e7d776d93dc1; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <342debc12183b51773b3345ba267e9263bdfaaef; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <4d55144b12e742404bb3f8fee6038bafbf45619d; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <7a742a9506849d1c1aa71e36c89855ceddc7d58e; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <829c49b6b2ff45b043739168fd1245e4e1a91a30; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <cc71a757da78dd4aa1b4a9b19cb011833730ccf2; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <e73c838c80dccb9e4f19becc11d9f3cb4a27d483; version=76e3cc126bb223013a6b9a0e2a51238d1ef2e409 <eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5OracleCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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