CVE-2025-38310

Uninitialized-memory read via undersized nexthop address

Published Jul 10, 2025 · Updated May 11, 2026

Improper nexthop validation in the Linux kernel allows local users to trigger an uninitialized-memory read through a malformed address. The seg6_local_policy in net/ipv6/seg6_local.c accepts a nexthop attribute shorter than its declared IPv4 or IPv6 length, so later processing reads bytes that user space did not initialize. Reachability requires local low-privileged access to submit Segment Routing IPv6 configuration; upstream does not state whether the read exposes data or causes a hang or crash.

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

Improper nexthop validation in the Linux kernel allows local users to trigger an uninitialized-memory read through a malformed address. The seg6_local_policy in net/ipv6/seg6_local.c accepts a nexthop attribute shorter than its declared IPv4 or IPv6 length, so later processing reads bytes that user space did not initialize. Reachability requires local low-privileged access to submit Segment Routing IPv6 configuration; upstream does not state whether the read exposes data or causes a hang or crash.

The record

CVE
CVE-2025-38310
Published
Jul 10, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 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=4.14
  2. Affected versionversion=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <668923c474608dd9ebce0fbcc41bd8a27aa73dd6
  3. Affected versionversion=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <7632fedb266d93ed0ed9f487133e6c6314a9b2d1
  4. Affected versionversion=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <cd4cd09810211fa23609c5c1018352e9e1cd8e5a
  5. Affected versionversion=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <cef33a86bcb04ecf4dc10c56f6c42ee9d1c54bac
  6. Affected versionversion=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <d2507aeea45b3c5aa24d5daae0cf3db76895c0b7
  7. Affected versionversion=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <d5d9fd13bc19a3f9f2a951c5b6e934d84205789e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <668923c474608dd9ebce0fbcc41bd8a27aa73dd6; version=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <7632fedb266d93ed0ed9f487133e6c6314a9b2d1; version=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <cd4cd09810211fa23609c5c1018352e9e1cd8e5a; version=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <cef33a86bcb04ecf4dc10c56f6c42ee9d1c54bac; version=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <d2507aeea45b3c5aa24d5daae0cf3db76895c0b7; version=d1df6fd8a1d22d37cffa0075ab8ad423ce656777 <d5d9fd13bc19a3f9f2a951c5b6e934d84205789e

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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