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{"bugzilla": {"description": "nix: Nix: Arbitrary file truncation via time-of-check/time-of-use race", "id": "2520584", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520584"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-367", "details": ["Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0.", "A flaw was found in Nix. A malicious derivation, when executed with the `recursive-nix` experimental feature enabled, can exploit a time-of-check/time-of-use (TOCTOU) race condition in the final symlink handling of the LocalStore restore path. This allows the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. This vulnerability does not allow for arbitrary content writes and requires a successful race condition."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. For additional information, refer to the upstream advisory at https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f. 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"rhoai/odh-model-registry-job-async-upload-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "conmon-rs", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "coreos-installer", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "kata-containers", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rpm-ostree", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rust-afterburn", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rust-bootupd", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rust-coreos-installer", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Fix deferred", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Fix deferred", "package_name": "quay/quay-rhel9", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-advisor-backend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-advisor-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vmaas-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:3", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-rhel10", "product_name": "Red Hat Trusted Profile Analyzer"}], "public_date": "2026-08-20T16:18:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64846\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64846\nhttps://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390\nhttps://github.com/NixOS/nix/pull/15401\nhttps://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f"], "statement": "A time-of-check/time-of-use (TOCTOU) race condition flaw was found in Nix's LocalStore restore path when handling final symlinks. When a malicious derivation is executed with the recursive-nix experimental feature enabled, this flaw allows the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with daemon user permissions. This vulnerability is rated as having a low security impact because it requires the recursive-nix experimental feature to be enabled (which is not enabled by default and is unlikely in production environments), requires winning a race condition, and does not allow arbitrary content writes\u2014only file truncation to empty files.", "threat_severity": "Low"}