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Vulnerability record · CVE-2024-27297 · published 11 March 2024

CVE-2024-27297: Nixos nix toctou race condition vulnerability

Nixos · Nix

Nix is a package manager for Linux and other Unix systems. A fixed-output derivations on Linux can send file descriptors to files in the Nix store to another program running on the host (or another fixed-output derivation) via Unix domain sockets in the abstract namespace. This allows to modify the output of the derivation, after Nix has registered the path as "valid" and immutable in the Nix database. In particular, this allows the output of fixed-output derivations to be modified from their expected content. This issue has been addressed in versions 2.3.18 2.18.2 2.19.4 and 2.20.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

5.9 CVSS 3.1 Medium EPSS 0.59% · top 54.2% CWE-367 · TOCTOU race condition
5.9CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Nix is a package manager for Linux and other Unix systems. A fixed-output derivations on Linux can send file descriptors to files in the Nix store to another program running on the host (or another fixed-output derivation) via Unix domain sockets in the abstract namespace. This allows to modify the output of the derivation, after Nix has registered the path as "valid" and immutable in the Nix database. In particular, this allows the output of fixed-output derivations to be modified from their expected content. This issue has been addressed in versions 2.3.18 2.18.2 2.19.4 and 2.20.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/NixOS/nix/commit/f8170ce9f119e5e6724eb81ff1b5a2d4c0024000 Patch
https://github.com/NixOS/nix/security/advisories/GHSA-2ffj-w4mj-pg37 Vendor Advisory
https://hackmd.io/03UGerewRcy3db44JQoWvw Exploit
https://github.com/NixOS/nix/commit/f8170ce9f119e5e6724eb81ff1b5a2d4c0024000 Patch
https://github.com/NixOS/nix/security/advisories/GHSA-2ffj-w4mj-pg37 Vendor Advisory
https://guix.gnu.org/en/blog/2025/privilege-escalation-vulnerabilities-2025/
https://hackmd.io/03UGerewRcy3db44JQoWvw Exploit

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-27297), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.