6.2 Medium

CVE-2026-96281 Flatpak: flatpak: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes

Description

On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could use this to expose other users of the same system to an app version with unfixed vulnerabilities.

CVSS 3.1 detail

CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Exploitable with physical access to the machine, with an ordinary account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Physical
Attack complexity: High
Privileges required: Low
Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 7	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published

References

access.redhat.com access.redhat.com
RHBZ#2539421 bugzilla.redhat.com
github.com github.com

Timeline

Published September 27, 2026
Last modified November 6, 2026

The 1455 CVEs of Red Hat Enterprise Linux 10 →

CVE-2026-120749 Dbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) when a broadcast from the driver cannot be delivered to a monitored bus 6.2 Medium CVE-2026-123151 Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail Not rated CVE-2026-121997 Gdb: gdbserver: heap buffer overflow in cmd_qtdpsrc via qtdpsrc declared/actual length mismatch 8.1 High CVE-2026-121996 Gdb: gdbserver: heap disclosure and wild pointer in gdb_parse_agent_expr via untrusted agent-expression length 8.2 High

Track this CVE