{"id":"CVE-2026-52791","aliases":["AZL-94145","DEBIAN-CVE-2026-52791","EUVD-2026-50403","GHSA-2cc4-p72c-v85h","MGASA-2026-0462","RHSA-2026:52805","SUSE-SU-2026:23252-1","SUSE-SU-2026:23469-1","SUSE-SU-2026:23618-1","SUSE-SU-2026:4026-1","UBUNTU-CVE-2026-52791","openSUSE-SU-2026:11461-1","openSUSE-SU-2026:21753-1"],"status":"published","title":"fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","severity":{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00145,"percentile":0.03847,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-266"],"published":"2026-07-29T16:14:46Z","modified":"2026-11-05T05:36:30Z","fixes":[{"ecosystem":"Red Hat:hummingbird:1","package":"fuse-overlayfs","fixed_in":["0:1.17-1.hum1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Micro 6.0","package":"fuse-overlayfs","fixed_in":["1.12-2.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Micro 6.2","package":"fuse-overlayfs","fixed_in":["1.15-160000.3.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server 16.0","package":"fuse-overlayfs","fixed_in":["1.15-160000.3.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server for SAP applications 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16.0","package":"fuse-overlayfs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15-160000.3.1"}]}]}],"products":[{"vendor":"containers","product":"fuse-overlayfs"}],"references":[{"url":"https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h","tags":["x_refsource_CONFIRM","exploit","advisory","article","report"]},{"url":"https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f","tags":["x_refsource_MISC","fix","article"]},{"url":"https://github.com/containers/fuse-overlayfs/releases/tag/v1.17","tags":["x_refsource_MISC","web","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52791","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52791.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-52791","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0462.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=36164","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OHDCW47LEOQXLVH2XJNC3A7VFVELJQ6U/","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/YO4BSFYJPI6ZGUIXZ3AHYYYFEYEM4MFO/","tags":["web"]},{"url":"https://github.com/containers/fuse-overlayfs/releases/tag/v1.18","tags":["web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:52805","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-52791","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_52805.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2508489","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52791","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623252-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1273100","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-52791","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623469-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623618-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264026-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-52791","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-52791","title":"fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T16:14:46.724Z","modified":"2026-07-29T17:56:43.388Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-266"],"updated_at":"2026-11-02T13:40:57.334596Z"}],"euvd":[{"id":"EUVD-2026-50403","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T16:14:46Z","modified":"2026-07-29T17:56:43Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T18:02:29.807737Z"}],"nvd":[{"id":"CVE-2026-52791","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T17:16:52.187Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-266"],"updated_at":"2026-11-02T14:12:33.629616Z"}],"osv":[{"id":"CVE-2026-52791","title":"fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T16:14:46.724Z","modified":"2026-10-28T11:16:51.069435233Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-266"],"updated_at":"2026-11-02T15:45:07.431113Z"},{"id":"DEBIAN-CVE-2026-52791","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T17:16:52.187Z","modified":"2026-10-25T09:47:39.261323972Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:45:56.877408Z"},{"id":"RHSA-2026:52805","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-09-09T10:17:05Z","modified":"2026-09-09T10:32:20.702891296Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:21.457353Z"},{"id":"UBUNTU-CVE-2026-52791","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T17:16:00Z","modified":"2026-10-17T12:58:34.376717096Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T16:56:33.391918Z"},{"id":"AZL-94145","title":"CVE-2026-52791 affecting package fuse-overlayfs 1.14-1","description":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","status":"published","published":"2026-07-29T17:16:52Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:25.880689Z"},{"id":"MGASA-2026-0462","title":"Updated fuse-overlayfs package fixes security vulnerabilities","description":"fuse-overlayfs release-1.x preserves SUID/SGID bits after\ntruncate/open(O_TRUNC). (CVE-2026-52791)\nOperations on hardlinked lower-layer files resolving to the wrong layer.\n(CVE-2026-77478)\n","status":"published","published":"2026-09-29T19:12:34Z","modified":"2026-09-29T19:15:04.664714441Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:11461-1","title":"fuse-overlayfs-1.17-1.1 on GA media","description":"These are all security issues fixed in the fuse-overlayfs-1.17-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-06T00:00:00Z","modified":"2026-08-07T10:00:45.095183273Z","updated_at":"2026-11-02T16:58:39.516824Z"},{"id":"openSUSE-SU-2026:21753-1","title":"Security update for fuse-overlayfs","description":"This update for fuse-overlayfs fixes the following issue:\n\n- CVE-2026-52791: privilege escalation due to SUID/SGID bit preservation after truncate operation (bsc#1273100).\n","status":"published","published":"2026-09-03T20:12:47Z","modified":"2026-09-09T18:23:14.071836753Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:23252-1","title":"Security update for fuse-overlayfs","description":"This update for fuse-overlayfs fixes the following issue:\n\n- CVE-2026-52791: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation (bsc#1273100).\n","status":"published","published":"2026-08-24T14:40:44Z","modified":"2026-08-27T18:23:12.176534201Z","updated_at":"2026-11-02T15:54:03.503431Z"},{"id":"SUSE-SU-2026:23469-1","title":"Security update for fuse-overlayfs","description":"This update for fuse-overlayfs fixes the following issue:\n\n- CVE-2026-52791: privilege escalation due to SUID/SGID bit preservation after truncate operation (bsc#1273100).\n","status":"published","published":"2026-09-03T20:12:02Z","modified":"2026-09-14T18:23:12.176495725Z","updated_at":"2026-11-02T15:54:03.503431Z"},{"id":"SUSE-SU-2026:23618-1","title":"Security update for fuse-overlayfs","description":"This update for fuse-overlayfs fixes the following issue:\n\n- CVE-2026-52791: privilege escalation due to SUID/SGID bit preservation after truncate operation (bsc#1273100).\n","status":"published","published":"2026-09-03T20:12:02Z","modified":"2026-09-29T18:23:19.80299786Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:4026-1","title":"Security update for fuse-overlayfs","description":"This update for fuse-overlayfs fixes the following issue:\n\n  - CVE-2026-52791: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation (bsc#1273100).\n","status":"published","published":"2026-09-07T07:44:14Z","modified":"2026-09-13T18:23:16.360581686Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}