CVE-2025-37914

Kernel compromise via reentrant classifier list insertion

Published May 20, 2025 · Updated Aug 5, 2026

Memory corruption in the ETS scheduler in Linux allows local users to read or write kernel memory or crash the host via crafted qdisc traffic. A reentrant enqueue from a netem child makes ETS add an already-linked class to active_list again, corrupting the doubly linked list. An unprivileged user can obtain the required CAP_NET_ADMIN inside a new user and network namespace; the resulting corruption can expose heap data, enable kernel-memory writes, panic the host, or stall transmission.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the ETS scheduler in Linux allows local users to read or write kernel memory or crash the host via crafted qdisc traffic. A reentrant enqueue from a netem child makes ETS add an already-linked class to active_list again, corrupting the doubly linked list. An unprivileged user can obtain the required CAP_NET_ADMIN inside a new user and network namespace; the resulting corruption can expose heap data, enable kernel-memory writes, panic the host, or stall transmission.

The record

CVE
CVE-2025-37914
Published
May 20, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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=5.6
  2. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <1a6d0c00fa07972384b0c308c72db091d49988b6
  3. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <1f01e9f961605eb397c6ecd1d7b0233dfbf9077c
  4. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <24388ba0a1b1b6d4af1b205927ac7f7b119ee4ea
  5. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <554acc5a2ea9703e08023eb9a003f9e5a830a502
  6. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3
  7. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990
  8. Affected versionversion=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <bc321f714de693aae06e3786f88df2975376d996

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <1a6d0c00fa07972384b0c308c72db091d49988b6; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <1f01e9f961605eb397c6ecd1d7b0233dfbf9077c; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <24388ba0a1b1b6d4af1b205927ac7f7b119ee4ea; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <554acc5a2ea9703e08023eb9a003f9e5a830a502; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990; version=dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <bc321f714de693aae06e3786f88df2975376d996

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-415Double Free
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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