CVE-2025-40267

Local service interruption via leaked iovec allocations

Published Dec 6, 2025 · Updated May 11, 2026

Resource exhaustion in Linux kernel 6.14 through 6.17.8 allows local users to interrupt service through aborted io_uring requests. The io_readv_writev_cleanup function recycles request data without first freeing rw->vec when internal caches have overflowed, leaving its allocated iovec unreleased. The request must fail early after those caches overflow; repeated leaks consume kernel memory and can interrupt host availability.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux kernel 6.14 through 6.17.8 allows local users to interrupt service through aborted io_uring requests. The io_readv_writev_cleanup function recycles request data without first freeing rw->vec when internal caches have overflowed, leaving its allocated iovec unreleased. The request must fail early after those caches overflow; repeated leaks consume kernel memory and can interrupt host availability.

The record

CVE
CVE-2025-40267
Published
Dec 6, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 6, 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=6.14
  2. Affected versionversion=9ac273ae3dc296905b4d61e4c8e7a25592f6d183 <094c6467fe05e0de618c5a7fcff4d3ee20aeaef8
  3. Affected versionversion=9ac273ae3dc296905b4d61e4c8e7a25592f6d183 <d3c9c213c0b86ac5dd8fe2c53c24db20f1f510bc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=9ac273ae3dc296905b4d61e4c8e7a25592f6d183 <094c6467fe05e0de618c5a7fcff4d3ee20aeaef8; version=9ac273ae3dc296905b4d61e4c8e7a25592f6d183 <d3c9c213c0b86ac5dd8fe2c53c24db20f1f510bc

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS: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 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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