CVE-2025-38587

Local system hang via unprotected IPv6 route traversal

Published Aug 19, 2025 · Updated May 23, 2026

Denial of service in the IPv6 routing code in affected Linux kernel releases allows local users to hang the system through a route-update race. fib6_info_uses_dev() traverses an RCU-managed route list without explicit protection and can follow an anchor removed concurrently by fib6_del_route() or fib6_add_rt2node(). Low-privileged local access and successful race timing are required; the documented consequence is an infinite loop that interrupts the system.

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

What happened

Denial of service in the IPv6 routing code in affected Linux kernel releases allows local users to hang the system through a route-update race. fib6_info_uses_dev() traverses an RCU-managed route list without explicit protection and can follow an anchor removed concurrently by fib6_del_route() or fib6_add_rt2node(). Low-privileged local access and successful race timing are required; the documented consequence is an infinite loop that interrupts the system.

The record

CVE
CVE-2025-38587
Published
Aug 19, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=11edcd026012ac18acee0f1514db3ed1b160fc6f
  2. Affected versionversion=34a949e7a0869dfa31a40416d2a56973fae1807b <db65739d406c72776fbdbbc334be827ef05880d2
  3. Affected versionversion=52da02521ede55fb86546c3fffd9377b3261b91f <9cb6de8ee144a94ae7a40bdb32560329ab7276f0
  4. Affected versionversion=6.11.11 <6.12
  5. Affected versionversion=6.1.128 <6.1.148
  6. Affected versionversion=6.12.2 <6.12.42
  7. Affected versionversion=6.13
  8. Affected versionversion=6.6.75 <6.6.102
  9. Affected versionversion=d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 <bc85e62394f008fa848c4ba02c936c735a3e8ef5
  10. Affected versionversion=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <16d21816c0918f8058b5fc14cbe8595d62046e2d
  11. Affected versionversion=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <e09be457b71b983a085312ff9e981f51e4ed3211
  12. Affected versionversion=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <f8d8ce1b515a0a6af72b30502670a406cfb75073

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=11edcd026012ac18acee0f1514db3ed1b160fc6f; version=34a949e7a0869dfa31a40416d2a56973fae1807b <db65739d406c72776fbdbbc334be827ef05880d2; version=52da02521ede55fb86546c3fffd9377b3261b91f <9cb6de8ee144a94ae7a40bdb32560329ab7276f0; version=6.11.11 <6.12; version=6.1.128 <6.1.148; version=6.12.2 <6.12.42; version=6.13; version=6.6.75 <6.6.102; version=d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 <bc85e62394f008fa848c4ba02c936c735a3e8ef5; version=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <16d21816c0918f8058b5fc14cbe8595d62046e2d; version=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <e09be457b71b983a085312ff9e981f51e4ed3211; version=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <f8d8ce1b515a0a6af72b30502670a406cfb75073

Published CVSS scores

7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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

T1499.004Application or System Exploitation

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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