Description
A race condition in the Nix, Lix, and Guix package managers enables changing the ownership of arbitrary files to the UID and GID of the build user (e.g., nixbld* or guixbuild*). This affects Nix before 2.24.15, 2.26.4, 2.28.4, and 2.29.1; Lix before 2.91.2, 2.92.2, and 2.93.1; and Guix before 1.4.0-38.0e79d5b.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NixOS | Nix | < 2.24.15, 2.25.0 – < 2.26.4, 2.27.0 – < 2.28.4, 2.29.0 – < 2.29.1 | 2.24.15 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 11 | guix | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | guix | No fix yet | — |
| Ubuntu Pro 22.04 LTS | guix | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nix | 2.29.1-1.1 | openSUSE-SU-2025:15248-1 |
Advisories 1
- openSUSE-SU-2025:15248-1 nix-2.29.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
References
- https://discourse.nixos.org/t/security-advisory-privilege-escalations-in-nix-lix-and-guix/66017
- https://lix.systems/blog/2025-06-24-lix-cves/
- https://guix.gnu.org/en/blog/2025/privilege-escalation-vulnerabilities-2025/
- https://labs.snyk.io
- https://security.snyk.io/vuln/?search=CVE-2025-52993
- https://security-tracker.debian.org/tracker/CVE-2025-52993