CVE-2025-40331

Kernel memory corruption via SCTP diagnostic race

Published Dec 9, 2025 · Updated Aug 5, 2026

Out-of-bounds write in Linux kernel SCTP diagnostics from 4.7 allows local users to corrupt kernel memory through a concurrent address-list change. The unlocked sctp_diag_dump path allocates output space from one address-list size, then sctp_ep_dump writes a larger list after that list grows. Low-privileged local access and a successful race are required; the directly established consequence is kernel memory corruption.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel SCTP diagnostics from 4.7 allows local users to corrupt kernel memory through a concurrent address-list change. The unlocked sctp_diag_dump path allocates output space from one address-list size, then sctp_ep_dump writes a larger list after that list grows. Low-privileged local access and a successful race are required; the directly established consequence is kernel memory corruption.

The record

CVE
CVE-2025-40331
Published
Dec 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 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=4.7
  2. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <2fe08fcaacb7eb019fa9c81db39b2214de216677
  3. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <3006959371007fc2eae4a078f823c680fa52de1a
  4. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <584307275b2048991b2e8984962189b6cc0a9b85
  5. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <72e3fea68eac8d088e44c3dd954e843478e9240e
  6. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <89eac1e150dbd42963e13d23828cb8c4e0763196
  7. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <95aef86ab231f047bb8085c70666059b58f53c09
  8. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <b106a68df0650b694b254427cd9250c04500edd3
  9. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <c9119f243d9c0da3c3b5f577a328de3e7ffd1b42

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=8f840e47f190cbe61a96945c13e9551048d42cef <2fe08fcaacb7eb019fa9c81db39b2214de216677; version=8f840e47f190cbe61a96945c13e9551048d42cef <3006959371007fc2eae4a078f823c680fa52de1a; version=8f840e47f190cbe61a96945c13e9551048d42cef <584307275b2048991b2e8984962189b6cc0a9b85; version=8f840e47f190cbe61a96945c13e9551048d42cef <72e3fea68eac8d088e44c3dd954e843478e9240e; version=8f840e47f190cbe61a96945c13e9551048d42cef <89eac1e150dbd42963e13d23828cb8c4e0763196; version=8f840e47f190cbe61a96945c13e9551048d42cef <95aef86ab231f047bb8085c70666059b58f53c09; version=8f840e47f190cbe61a96945c13e9551048d42cef <b106a68df0650b694b254427cd9250c04500edd3; version=8f840e47f190cbe61a96945c13e9551048d42cef <c9119f243d9c0da3c3b5f577a328de3e7ffd1b42

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7OracleCVSS:3.1/AV:L/AC:H/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 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

No sourced classifications are available.

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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