CVE-2024-27297Public exploit

Build-output corruption via leaked writable file descriptor

Published Mar 11, 2024 · Updated Jun 27, 2025

TOCTOU race in affected Nix releases allows local users to alter fixed-output derivations through abstract Unix sockets. A Linux fixed-output derivation can pass a writable store-path file descriptor over an abstract-namespace Unix domain socket, retaining it after Nix validates and marks the path immutable. Exploitation requires an untrusted fixed-output build and a cooperating host process or derivation, enabling post-validation corruption of expected build output.

CVSS severity6.3
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU race in affected Nix releases allows local users to alter fixed-output derivations through abstract Unix sockets. A Linux fixed-output derivation can pass a writable store-path file descriptor over an abstract-namespace Unix domain socket, retaining it after Nix validates and marks the path immutable. Exploitation requires an untrusted fixed-output build and a cooperating host process or derivation, enabling post-validation corruption of expected build output.

The record

CVE
CVE-2024-27297
Published
Mar 11, 2024
Updated
Jun 27, 2025
Vendor
NixOS
Product
Nix
Classifications
CWE-367, T1195.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 27, 2025Record 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=>= 2.19.0, < 2.19.4
  2. Affected versionversion=>= 2.20.0, < 2.20.5
  3. Affected versionversion=>= 2.3.0, < 2.3.18
  4. Affected versionversion=>= 2.4.0, < 2.18.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

NixOS · Nixversion=>= 2.19.0, < 2.19.4; version=>= 2.20.0, < 2.20.5; version=>= 2.3.0, < 2.3.18; version=>= 2.4.0, < 2.18.2

Published CVSS scores

6.3GitHubCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1195.001Compromise Software Dependencies and Development Tools

Public exploit references

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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