{"id":"CVE-2026-96808","aliases":["ALSA-2026:80497","ALSA-2026:80498","ALSA-2026:80687","CLSA-2026-1790844951","CLSA-2026-1791735799","DEBIAN-CVE-2026-96808","EUVD-2026-85424","GHSA-qrwq-7qwx-q9rp","OESA-2026-4569","OESA-2026-4571","RHSA-2026:80497","RHSA-2026:80498","RHSA-2026:80687","RLSA-2026:80497","RLSA-2026:80498","RLSA-2026:80687","SUSE-SU-2026:4610-1","SUSE-SU-2026:4944-1","SUSE-SU-2026:5127-1","UBUNTU-CVE-2026-96808"],"status":"published","title":"Important: flatpak security update","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00115,"percentile":0.01552,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-61"],"published":"2026-09-23T16:58:37Z","modified":"2026-11-07T11:30:04Z","fixes":[{"ecosystem":"TuxCare:AlmaLinux:9.6","package":"flatpak","fixed_in":["1.12.9-4.el9_6.tuxcare.els4"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.6","package":"flatpak-devel","fixed_in":["1.12.9-4.el9_6.tuxcare.els4"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.6","package":"flatpak-libs","fixed_in":["1.12.9-4.el9_6.tuxcare.els4"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.6","package":"flatpak-selinux","fixed_in":["1.12.9-4.el9_6.tuxcare.els4"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.6","package":"flatpak-session-helper","fixed_in":["1.12.9-4.el9_6.tuxcare.els4"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.6","package":"flatpak-tests","fixed_in":["1.12.9-4.el9_6.tuxcare.els4"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"flatpak","fixed_in":["1.12.7-2.el9_2.tuxcare.els8"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"flatpak-devel","fixed_in":["1.12.7-2.el9_2.tuxcare.els8"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"flatpak-libs","fixed_in":["1.12.7-2.el9_2.tuxcare.els8"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"flatpak-selinux","fixed_in":["1.12.7-2.el9_2.tuxcare.els8"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"flatpak-session-helper","fixed_in":["1.12.7-2.el9_2.tuxcare.els8"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"flatpak-tests","fixed_in":["1.12.7-2.el9_2.tuxcare.els8"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"flatpak","fixed_in":["1.16.6-1~deb13u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"flatpak","fixed_in":["1.18.1-1"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP4","package":"flatpak","fixed_in":["1.10.2-16.oe2203sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP4","package":"flatpak","fixed_in":["1.10.2-16.oe2403sp4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"AlmaLinux:9","package":"flatpak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-4.el9_8.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:9","package":"flatpak-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-4.el9_8.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:9","package":"flatpak-libs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-4.el9_8.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:9","package":"flatpak-selinux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-4.el9_8.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:9","package":"flatpak-session-helper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-4.el9_8.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:10","package":"flatpak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.0-9.el10_2.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:10","package":"flatpak-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.0-9.el10_2.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:10","package":"flatpak-libs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.0-9.el10_2.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:10","package":"flatpak-selinux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.0-9.el10_2.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:10","package":"flatpak-session-helper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.0-9.el10_2.4"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:8","package":"flatpak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-7.el8_10"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:8","package":"flatpak-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-7.el8_10"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:8","package":"flatpak-libs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-7.el8_10"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:8","package":"flatpak-selinux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-7.el8_10"}]}],"bundled":4},{"source":"osv","ecosystem":"AlmaLinux:8","package":"flatpak-session-helper","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.9-7.el8_10"}]}],"bundled":4},{"source":"osv","ecosystem":"TuxCare:Alma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CVE-2026-96280","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96280","tags":["advisory"]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc","tags":["article"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96808","tags":["advisory","report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_80498.json","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_80687.json","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:80497","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:80498","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:80687","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264610-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1280236","tags":["report"]},{"url":"https://bugzilla.suse.com/1282514","tags":["report"]},{"url":"https://bugzilla.suse.com/1282515","tags":["report"]},{"url":"https://bugzilla.suse.com/1282516","tags":["report"]},{"url":"https://bugzilla.suse.com/1282519","tags":["report"]},{"url":"https://bugzilla.suse.com/1282520","tags":["report"]},{"url":"https://bugzilla.suse.com/1282521","tags":["report"]},{"url":"https://bugzilla.suse.com/1282523","tags":["report"]},{"url":"https://bugzilla.suse.com/1282524","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-90616","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-92162","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96275","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96276","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96281","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96282","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96283","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96807","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96808","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264944-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1282518","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96280","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20265127-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1261769","tags":["report"]},{"url":"https://bugzilla.suse.com/1261770","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34078","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34079","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-96808","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-96808","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","status":"published","published":"2026-09-23T16:58:37.139Z","modified":"2026-09-23T18:22:46.208Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T14:20:00.879257Z"}],"euvd":[{"id":"EUVD-2026-85424","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","status":"published","published":"2026-09-23T16:58:37Z","modified":"2026-09-23T18:22:46Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:00.170339Z"}],"nvd":[{"id":"CVE-2026-96808","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","status":"published","published":"2026-09-23T17:17:25.86Z","modified":"2026-09-24T21:00:46.893Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T14:12:50.703874Z"}],"osv":[{"id":"CVE-2026-96808","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","status":"published","published":"2026-09-23T16:58:37.139Z","modified":"2026-11-07T11:41:57.590187569Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-61"],"updated_at":"2026-11-07T12:16:09.040155Z"},{"id":"DEBIAN-CVE-2026-96808","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","status":"published","published":"2026-09-23T17:17:25.86Z","modified":"2026-09-25T08:47:33.30611052Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:07.324252Z"},{"id":"OESA-2026-4569","title":"flatpak security update","description":"flatpak is a system for building, distributing and running sandboxed desktop applications on Linux. See https://wiki.gnome.org/Projects/SandboxedApps for more information.\r\n\r\nSecurity Fix(es):\n\nIn Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session\u0026apos;s directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.(CVE-2026-96808)","status":"published","published":"2026-10-29T09:03:03Z","modified":"2026-10-29T09:15:29.947057381Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4571","title":"flatpak security update","description":"flatpak is a system for building, distributing and running sandboxed desktop applications on Linux. See https://wiki.gnome.org/Projects/SandboxedApps for more information.\r\n\r\nSecurity Fix(es):\n\nIn Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session\u0026apos;s directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.(CVE-2026-96808)","status":"published","published":"2026-10-29T09:03:04Z","modified":"2026-10-29T09:15:30.664730282Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"RHSA-2026:80497","title":"Red Hat Security Advisory: flatpak security update","status":"published","published":"2026-10-14T10:31:41Z","modified":"2026-10-14T10:48:13.219641714Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"RHSA-2026:80498","title":"Red Hat Security Advisory: flatpak security update","status":"published","published":"2026-10-14T10:31:42Z","modified":"2026-10-14T10:48:08.669143177Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"RHSA-2026:80687","title":"Red Hat Security Advisory: flatpak security update","status":"published","published":"2026-10-14T10:32:12Z","modified":"2026-10-14T10:48:08.811153436Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"RLSA-2026:80497","title":"Important: flatpak security update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.\n\nSecurity Fix(es):\n\n* flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)\n\n* flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)\n\n* flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)\n\n* flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-10-13T12:04:29.039883Z","modified":"2026-10-13T12:30:03.726111885Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"RLSA-2026:80498","title":"Important: flatpak security update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.\n\nSecurity Fix(es):\n\n* flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)\n\n* flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)\n\n* flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)\n\n* flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-10-13T12:08:58.021554Z","modified":"2026-10-13T12:30:02.88417664Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"RLSA-2026:80687","title":"Important: flatpak security update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.\n\nSecurity Fix(es):\n\n* flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)\n\n* flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)\n\n* flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)\n\n* flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-10-13T12:01:18.594323Z","modified":"2026-10-13T12:30:02.892467525Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"UBUNTU-CVE-2026-96808","description":"In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.","status":"published","published":"2026-09-23T17:17:00Z","modified":"2026-09-30T21:39:34Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"ALSA-2026:80497","title":"Important: flatpak security update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.  \n\nSecurity Fix(es):  \n\n  * flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)\n  * flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)\n  * flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)\n  * flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-10-12T00:00:00Z","modified":"2026-10-29T11:32:38.070178714Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"ALSA-2026:80498","title":"Important: flatpak security update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.  \n\nSecurity Fix(es):  \n\n  * flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)\n  * flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)\n  * flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)\n  * flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-10-12T00:00:00Z","modified":"2026-10-29T11:30:22.713968158Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"ALSA-2026:80687","title":"Important: flatpak security update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.  \n\nSecurity Fix(es):  \n\n  * flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)\n  * flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)\n  * flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)\n  * flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-10-12T00:00:00Z","modified":"2026-10-29T11:00:51.469330547Z","updated_at":"2026-11-02T15:27:55.200553Z"},{"id":"CLSA-2026-1790844951","title":"flatpak: Fix of CVE-2026-96808","description":"- CVE-2026-96808: the revokefs writer validated the paths its unprivileged\n  client sends with validate_path()/get_valid_path(), which rejected literal\n  \"..\" components but followed symlinks, so a local user holding two revokefs\n  sessions could make one session write through a symlink into the other and\n  tamper with ostree objects after flatpak-system-helper had verified them;\n  the request handlers now resolve the parent directory with\n  glnx_chaseat(GLNX_CHASE_RESOLVE_BENEATH) through the new chase_parent(),\n  chase_request_path(), chase_request_2path() and chase_request_any_and_path()\n  helpers and act on the final component with *at() syscalls confined beneath\n  basefd","status":"published","published":"2026-10-01T08:56:03Z","modified":"2026-10-26T09:31:36.693541206Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1791735799","title":"flatpak: Fix of CVE-2026-96808","description":"- CVE-2026-96808: fix local privilege escalation via symlink path\n  traversal in the revokefs writer used by flatpak-system-helper","status":"published","published":"2026-10-11T16:23:29Z","modified":"2026-10-26T09:30:15.673013351Z","updated_at":"2026-11-02T15:43:50.599064Z"},{"id":"SUSE-SU-2026:4610-1","title":"Security update for flatpak","description":"This update for flatpak fixes the following issues:\n\n- CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and write access\n  to files on the host (bsc#1280236).\n- CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).\n- CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).\n- CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).\n- CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes (bsc#1282519).\n- CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).\n- CVE-2026-96283: flatpak-system-helper: cross-user `CancelPull` orphans another user's ongoing pull (bsc#1282521).\n- CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so` (bsc#1282523).\n- CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering\n  (bsc#1282524).\n","status":"published","published":"2026-10-09T15:55:00Z","modified":"2026-10-10T09:30:06.446561391Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:4944-1","title":"Security update for flatpak","description":"This update for flatpak fixes the following issues:\n\n- CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and write access\n  to files on the host (bsc#1280236).\n- CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).\n- CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).\n- CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).\n- CVE-2026-96280: buffer overflow in OCI delta stream path names (bsc#1282518).\n- CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes (bsc#1282519).\n- CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).\n- CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so` (bsc#1282523).\n- CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering\n  (bsc#1282524).\n\nChanges for flatpak:\n\n- Update to version 1.16.6 (jsc#PED-17048):\n + Fix file descriptor leaks affecting Chromium-based browsers.\n + Fix installing extra-data without a runtime, including openh264.\n + Fix unusable sandbox-expose paths affecting Epiphany.\n + Fix installed tests and handling of file descriptor arguments.\n- Changes from version 1.16.5:\n + Fix regressions from the sandbox escape security fix affecting\n browsers, browser-based apps and Steam.\n + Expand test coverage of flatpak-run features used by the portal.\n- Changes from version 1.16.4:\n + Prevent arbitrary file reads in the system-helper context\n (GHSA-2fxp-43j9-pwvc).\n + Prevent orphaning cross-user pull operations (GHSA-89xm-3m96-w3jg).\n- Changes from version 1.16.3:\n + Be selective about mapping font-dirs.xml in flatpak build.\n- Changes from version 1.16.2:\n + Support reinstalling bundle installations and Intel Xe VA-API.\n + Add cancellation support for curl downloads.\n + Fix font configuration, mask and pin configuration reloads,\n unintended home directory access, flatpak kill, OCI support,\n memory leaks and crashes.\n- Changes from version 1.16.1:\n + Allow updating existing apps under parental controls by default.\n + Use instance IDs for systemd scopes and include /dev/udmabuf\n with --device=dri.\n + Speed up prune --dry-run and permission-reset.\n + Support TLS certificates in /etc/containers/certs.d for OCI.\n + Fix portal crashes, sandbox environment handling, accessibility\n bus discovery, error reporting and shell completion.\n + Update documentation and translations.\n","status":"published","published":"2026-10-29T16:29:47Z","modified":"2026-10-31T18:00:03.939717669Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:5127-1","title":"Security update for flatpak","description":"This update for flatpak fixes the following issues:\n\n- CVE-2026-34078: Arbitrary code execution via crafted symlinks in sandbox-expose options (bsc#1261769).\n- CVE-2026-34079: Arbitrary file deletion on host via improper cache file path validation (bsc#1261770).\n- CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and write access\n  to files on the host (bsc#1280236).\n- CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).\n- CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).\n- CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).\n- CVE-2026-96280: buffer overflow in OCI delta stream path names (bsc#1282518).\n- CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes (bsc#1282519).\n- CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).\n- CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so` (bsc#1282523).\n- CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering\n  (bsc#1282524).\n\nChanges for flatpak:\n\n- Update to version 1.16.6 (jsc#PED-17048):\n + Fix file descriptor leaks affecting Chromium-based browsers.\n + Fix installing extra-data without a runtime, including OpenH264.\n + Ignore unusable sandbox-expose paths for portal sub-sandboxes,\n fixing Epiphany regressions.\n + Fix installed tests and handling of standard file descriptors\n passed as invalid flatpak run arguments.\n- Switch from Autotools to Meson, preserving system bubblewrap,\n xdg-dbus-proxy, curl and distribution-specific installation paths.\n- Require bubblewrap \u003e= 0.10.0 and GPGME \u003e= 1.8.0; add Meson,\n gettext, gtk-doc and polkit-agent build dependencies and drop\n obsolete intltool and libelf build dependencies.\n- Generate the system-user pre-script from the Meson build directory\n and package the tmpfiles configuration and renamed manual pages.\n","status":"published","published":"2026-11-06T08:27:38Z","modified":"2026-11-07T11:30:04.13853174Z","updated_at":"2026-11-07T11:45:54.882758Z"}]}}