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{"bugzilla": {"description": "fuse-overlayfs: fuse-overlayfs: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation", "id": "2508489", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508489"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-281", "details": ["A flaw was found in fuse-overlayfs, a component used for rootless containers. This vulnerability allows a low-privileged process to retain SUID (Set User ID) and SGID (Set Group ID) permissions on files after they are truncated or opened with the O_TRUNC flag. This can enable a local attacker to manipulate file permissions, potentially leading to privilege escalation within the system."], "mitigation": {"lang": "en:us", "value": "Avoid configuring fuse-overlayfs as the storage mount_program for rootless Podman/Buildah where native overlayfs support is available (this is not the default on supported RHEL releases). Ensure container images do not ship world- or group-writable files with the SUID or SGID bit set. No other mitigation is available prior to upgrading to fuse-overlayfs >= 1.17."}, "name": "CVE-2026-52791", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "fuse-overlayfs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "container-tools:rhel8/fuse-overlayfs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "fuse-overlayfs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "fuse-overlayfs", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Out of support scope", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-29T16:14:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52791\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52791\nhttps://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f\nhttps://github.com/containers/fuse-overlayfs/releases/tag/v1.17\nhttps://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"], "statement": "Red Hat is aware of this issue affecting fuse-overlayfs, which is used as an optional, non-default storage backend for rootless Podman/Buildah on kernels or configurations where native (kernel) overlayfs support for user namespaces is unavailable. On currently supported Red Hat Enterprise Linux releases (RHEL >= 8.5 / RHEL 9 / RHEL 10), rootless Podman uses native kernel overlayfs by default; fuse-overlayfs is only invoked as a fallback or when explicitly configured via storage.conf's mount_program option, or in nested/unprivileged container scenarios (e.g. rootless Buildah image builds) that lack CAP_SYS_ADMIN. Exploitation additionally requires a pre-existing file in the container's lower image layer that already carries the SUID or SGID bit and is writable by a low-privileged process, an atypical container image configuration. Red Hat rates the overall risk of this issue as reduced relative to a generic worst-case rating given these preconditions; see the private triage comment on this flaw for the full reachability and CVSS analysis.", "threat_severity": "Moderate"}