CVE-2025-40341

Cross-privilege pointer disclosure via futex exec race

Published Dec 9, 2025 · Updated May 11, 2026

Information disclosure in the Linux kernel futex subsystem allows local users to read privileged-process pointers during an exec race. The get_robust_list syscalls check ptrace access before exec but read robust_list afterward without locking the target's exec state. An unprivileged caller must race a target entering a setuid-root executable, exposing memory addresses across a privilege boundary as an exploit-chain primitive.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel futex subsystem allows local users to read privileged-process pointers during an exec race. The get_robust_list syscalls check ptrace access before exec but read robust_list afterward without locking the target's exec state. An unprivileged caller must race a target entering a setuid-root executable, exposing memory addresses across a privilege boundary as an exploit-chain primitive.

The record

CVE
CVE-2025-40341
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 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=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <3b4222494489f6d4b8705a496dab03384b7ca998
  2. Affected versionversion=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <4aced32596ead1820b7dbd8e40d30b30dc1f3ad4
  3. Affected versionversion=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <6511984d1aa1360181bcafb1ca75df7f291ef237
  4. Affected versionversion=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <6b54082c3ed4dc9821cdf0edb17302355cc5bb45
  5. Affected versionversion=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <b524455a51feb6013df3a5dba3160487b2e8e22a
  6. Affected versionversion=2.6.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <3b4222494489f6d4b8705a496dab03384b7ca998; version=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <4aced32596ead1820b7dbd8e40d30b30dc1f3ad4; version=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <6511984d1aa1360181bcafb1ca75df7f291ef237; version=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <6b54082c3ed4dc9821cdf0edb17302355cc5bb45; version=0771dfefc9e538f077d0b43b6dec19a5a67d0e70 <b524455a51feb6013df3a5dba3160487b2e8e22a; version=2.6.17

Published CVSS scores

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1005Data from Local System

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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