CVE-2025-38032

Service interruption via loose routing-table cleanup check

Published Jun 18, 2025 · Updated May 11, 2026

Incomplete cleanup in Linux kernel 6.13 allows local users to interrupt service by unsharing a network namespace. When CONFIG_IP_MROUTE_MULTIPLE_TABLES is disabled, ipmr_rules_exit applies a loose eligibility check that lets ipmr_free_table process an ineligible multicast-routing table during namespace teardown. Low-privilege local access and the affected kernel configuration are required; reaching the path raises a kernel warning and disrupts availability.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incomplete cleanup in Linux kernel 6.13 allows local users to interrupt service by unsharing a network namespace. When CONFIG_IP_MROUTE_MULTIPLE_TABLES is disabled, ipmr_rules_exit applies a loose eligibility check that lets ipmr_free_table process an ineligible multicast-routing table during namespace teardown. Low-privilege local access and the affected kernel configuration are required; reaching the path raises a kernel warning and disrupts availability.

The record

CVE
CVE-2025-38032
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=50b94204446e1215af081fd713d7d566d9258e35 <1c518ae98302ab37786d5ba5d43e9ac6d6f894e3
  2. Affected versionversion=50b94204446e1215af081fd713d7d566d9258e35 <c46286fdd6aa1d0e33c245bcffe9ff2428a777bd
  3. Affected versionversion=6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=50b94204446e1215af081fd713d7d566d9258e35 <1c518ae98302ab37786d5ba5d43e9ac6d6f894e3; version=50b94204446e1215af081fd713d7d566d9258e35 <c46286fdd6aa1d0e33c245bcffe9ff2428a777bd; version=6.13

Published CVSS scores

5.5UbuntuCVSS: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

T1499Endpoint Denial of Service

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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