{"id":"DEBIAN-CVE-2026-16552","details":"A flaw was found in systemd-tmpfiles. When processing a tmpfiles.d configuration entry that writes to a file, systemd-tmpfiles can follow a symbolic link placed by an unprivileged local user, and an existing safety check does not detect this specific case because it always treats transitions away from the root user as safe. On systems where a tmpfiles.d configuration targets a path an unprivileged user can influence, this could allow that user to redirect a privileged systemd-tmpfiles write to a file of their choosing, though the content written remains determined by the existing configuration rather than by the unprivileged user. The highest threat from this vulnerability is to integrity.","modified":"2026-07-24T02:00:40.618922475Z","published":"2026-07-22T16:17:16.653Z","withdrawn":"2026-07-24T02:00:40.618922223Z","upstream":["CVE-2026-16552"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-16552"}],"affected":[{"package":{"name":"systemd","ecosystem":"Debian:11","purl":"pkg:deb/debian/systemd?arch=source&distro=bullseye"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["247.3-6","247.3-7","247.3-7+deb11u1","247.3-7+deb11u2","247.3-7+deb11u3","247.3-7+deb11u4","247.3-7+deb11u5","247.3-7+deb11u6","247.3-7+deb11u7","247.3-7+deb11u8","247.9-1","247.9-2","247.9-3","247.9-4","248-1","248.1-1","248.2-1","248.3-1","249-1","249.1-1","249.2-1","249.2-2","249.3-1","249.3-2","249.3-3","249.3-4","249.4-1","249.4-2","249.5-1","249.5-2","249.6-1","249.6-2","249.6-3","249.7-1","249~rc1-1","249~rc2-1","249~rc3-1","250-1","250-2","250.1-2","250.2-1","250.2-2","250.2-3","250.3-1","250.3-2","250.3-2~bpo11+1","250.4-1","250.4-1~bpo11+1","250~rc3-1","251-1","251-2","251.1-1","251.2-1","251.2-2","251.2-3","251.2-4","251.2-5","251.2-6","251.2-7","251.2-8","251.3-1","251.3-1~bpo11+1","251.3-2","251.3-2~exp1","251.3-2~exp2","251.4-1","251.4-2","251.4-3","251.5-1","251.5-2","251.5-3","251.6-1","251~rc1-1","251~rc1-2","251~rc1-3","251~rc2-1","251~rc2-2","251~rc3-1","251~rc3-2","252-1","252-2","252-3","252.1-1","252.11-1","252.11-1~deb12u1","252.12-1~deb12u1","252.14-1~deb12u1","252.16-1~deb12u1","252.17-1~deb12u1","252.18-1~deb12u1","252.19-1~deb12u1","252.2-1","252.2-2","252.20-1~deb12u1","252.21-1~deb12u1","252.22-1~deb12u1","252.23-1~deb12u1","252.24-1~deb12u1","252.25-1~deb12u1","252.26-1~deb12u1","252.26-1~deb12u2","252.26-1~deb12u2~bpo11+1","252.27-1~deb12u1","252.28-1~deb12u1","252.29-1~deb12u1","252.29-1~deb12u1~bpo11+1","252.3-1","252.3-2","252.30-1~deb12u1","252.30-1~deb12u2","252.31-1~deb12u1","252.32-1~deb12u1","252.33-1~deb12u1","252.36-1~deb12u1","252.38-1~deb12u1","252.39-1~deb12u1","252.39-1~deb12u2","252.4-1","252.4-1~bpo11+1","252.4-2","252.5-1","252.5-2","252.5-2~bpo11+1","252.6-1","252.6-1+loong64","252~rc2-1","252~rc3-1","252~rc3-2","253-1","253-2","253-3","253-4","253.5-1","253~rc2-1","253~rc3-1","254-1","254.1-1","254.1-2","254.1-3","254.14-1~bpo12+1","254.15-1~bpo12+1","254.16-1~bpo12+1","254.22-1~bpo12+1","254.26-1~bpo12+1","254.3-1","254.4-1","254.5-1","254.5-1~bpo12+1","254.5-1~bpo12+2","254.5-1~bpo12+3","254~rc1-1","254~rc1-2","254~rc1-3","254~rc1-4","254~rc2-1","254~rc2-2","254~rc2-3","254~rc3-1","254~rc3-2","254~rc3-3","255-1","255.1-1","255.1-2","255.1-3","255.2-1","255.2-2","255.2-3","255.2-4","255.3-1","255.3-2","255.4-1","255.5-1","255~rc1-1","255~rc1-2","255~rc1-3","255~rc1-4","255~rc2-1","255~rc2-2","255~rc2-3","255~rc3-1","255~rc3-2","255~rc3-3","255~rc4-1","255~rc4-2","256-1","256-2","256.1-1","256.1-2","256.2-1","256.4-1","256.4-2","256.4-3","256.5-1","256.5-2","256.6-1","256.7-1","256.7-2","256.7-3","256~rc1-1~exp","256~rc1-1~exp2","256~rc2-1","256~rc2-2","256~rc2-3","256~rc3-1","256~rc3-2","256~rc3-3","256~rc3-4","256~rc3-5","256~rc3-6","256~rc3-7","256~rc4-1","257-1","257-2","257.1-1","257.1-2","257.1-3","257.1-4","257.1-5","257.1-6","257.1-7","257.13-1~deb13u1","257.2-1","257.2-2","257.2-3","257.3-1","257.4-1","257.4-2","257.4-3","257.4-4","257.4-5","257.4-6","257.4-7","257.4-8","257.4-9","257.5-1","257.5-2","257.6-1","257.7-1","257.8-1~deb13u1","257.8-1~deb13u2","257.9-1~deb13u1","257~rc1-1","257~rc1-2","257~rc1-3","257~rc1-4","257~rc2-1","257~rc2-2","257~rc2-3","257~rc3-1","258-1","258.1-1","258.1-2","258~rc1-1","258~rc2-1","258~rc2-2","258~rc3-1","258~rc4-1","259-1","259.1-1","259~rc1-1","259~rc2-1","259~rc3-1","260-1","260.1-1","260~rc1-1","260~rc1-2","260~rc2-1","260~rc3-1","260~rc4-1","261-1","261-2","261.1-1","261.1-2","261.1-3","261~rc1-1","261~rc2-1","261~rc3-1","261~rc4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-16552.json"}},{"package":{"name":"systemd","ecosystem":"Debian:12","purl":"pkg:deb/debian/systemd?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["252.11-1","252.11-1~deb12u1","252.12-1~deb12u1","252.14-1~deb12u1","252.16-1~deb12u1","252.17-1~deb12u1","252.18-1~deb12u1","252.19-1~deb12u1","252.20-1~deb12u1","252.21-1~deb12u1","252.22-1~deb12u1","252.23-1~deb12u1","252.24-1~deb12u1","252.25-1~deb12u1","252.26-1~deb12u1","252.26-1~deb12u2","252.26-1~deb12u2~bpo11+1","252.27-1~deb12u1","252.28-1~deb12u1","252.29-1~deb12u1","252.29-1~deb12u1~bpo11+1","252.30-1~deb12u1","252.30-1~deb12u2","252.31-1~deb12u1","252.32-1~deb12u1","252.33-1~deb12u1","252.36-1~deb12u1","252.38-1~deb12u1","252.39-1~deb12u1","252.39-1~deb12u2","252.6-1","252.6-1+loong64","253-1","253-2","253-3","253-4","253.5-1","253~rc2-1","253~rc3-1","254-1","254.1-1","254.1-2","254.1-3","254.14-1~bpo12+1","254.15-1~bpo12+1","254.16-1~bpo12+1","254.22-1~bpo12+1","254.26-1~bpo12+1","254.3-1","254.4-1","254.5-1","254.5-1~bpo12+1","254.5-1~bpo12+2","254.5-1~bpo12+3","254~rc1-1","254~rc1-2","254~rc1-3","254~rc1-4","254~rc2-1","254~rc2-2","254~rc2-3","254~rc3-1","254~rc3-2","254~rc3-3","255-1","255.1-1","255.1-2","255.1-3","255.2-1","255.2-2","255.2-3","255.2-4","255.3-1","255.3-2","255.4-1","255.5-1","255~rc1-1","255~rc1-2","255~rc1-3","255~rc1-4","255~rc2-1","255~rc2-2","255~rc2-3","255~rc3-1","255~rc3-2","255~rc3-3","255~rc4-1","255~rc4-2","256-1","256-2","256.1-1","256.1-2","256.2-1","256.4-1","256.4-2","256.4-3","256.5-1","256.5-2","256.6-1","256.7-1","256.7-2","256.7-3","256~rc1-1~exp","256~rc1-1~exp2","256~rc2-1","256~rc2-2","256~rc2-3","256~rc3-1","256~rc3-2","256~rc3-3","256~rc3-4","256~rc3-5","256~rc3-6","256~rc3-7","256~rc4-1","257-1","257-2","257.1-1","257.1-2","257.1-3","257.1-4","257.1-5","257.1-6","257.1-7","257.13-1~deb13u1","257.2-1","257.2-2","257.2-3","257.3-1","257.4-1","257.4-2","257.4-3","257.4-4","257.4-5","257.4-6","257.4-7","257.4-8","257.4-9","257.5-1","257.5-2","257.6-1","257.7-1","257.8-1~deb13u1","257.8-1~deb13u2","257.9-1~deb13u1","257~rc1-1","257~rc1-2","257~rc1-3","257~rc1-4","257~rc2-1","257~rc2-2","257~rc2-3","257~rc3-1","258-1","258.1-1","258.1-2","258~rc1-1","258~rc2-1","258~rc2-2","258~rc3-1","258~rc4-1","259-1","259.1-1","259~rc1-1","259~rc2-1","259~rc3-1","260-1","260.1-1","260~rc1-1","260~rc1-2","260~rc2-1","260~rc3-1","260~rc4-1","261-1","261-2","261.1-1","261.1-2","261.1-3","261~rc1-1","261~rc2-1","261~rc3-1","261~rc4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-16552.json"}},{"package":{"name":"systemd","ecosystem":"Debian:13","purl":"pkg:deb/debian/systemd?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["257.13-1~deb13u1","257.7-1","257.8-1~deb13u1","257.8-1~deb13u2","257.9-1~deb13u1","258-1","258.1-1","258.1-2","258~rc1-1","258~rc2-1","258~rc2-2","258~rc3-1","258~rc4-1","259-1","259.1-1","259~rc1-1","259~rc2-1","259~rc3-1","260-1","260.1-1","260~rc1-1","260~rc1-2","260~rc2-1","260~rc3-1","260~rc4-1","261-1","261-2","261.1-1","261.1-2","261.1-3","261~rc1-1","261~rc2-1","261~rc3-1","261~rc4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-16552.json"}},{"package":{"name":"systemd","ecosystem":"Debian:14","purl":"pkg:deb/debian/systemd?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["257.13-1~deb13u1","257.7-1","257.8-1~deb13u1","257.8-1~deb13u2","257.9-1~deb13u1","258-1","258.1-1","258.1-2","258~rc1-1","258~rc2-1","258~rc2-2","258~rc3-1","258~rc4-1","259-1","259.1-1","259~rc1-1","259~rc2-1","259~rc3-1","260-1","260.1-1","260~rc1-1","260~rc1-2","260~rc2-1","260~rc3-1","260~rc4-1","261-1","261-2","261.1-1","261.1-2","261.1-3","261~rc1-1","261~rc2-1","261~rc3-1","261~rc4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-16552.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H"}]}