{"id":"UBUNTU-CVE-2026-120749","details":"A flaw was found in D-Bus. With a privileged Monitoring client attached (for example dbus-monitor or busctl monitor), an unprivileged local user can cause dbus-daemon to abort if a driver-originated broadcast such as NameOwnerChanged or ActivatableServicesChanged cannot be delivered to a recipient (for example due to a deny rule or an exceeded outgoing message queue). Driver broadcasts still use serial 0; when delivery fails, composing the monitor error reply asserts reply_serial != 0 and aborts the daemon. This is an incomplete fix for CVE-2023-34969, which only assigned serials for driver messages sent to a single recipient. On the well-known system bus this is a denial of service.","modified":"2026-11-07T01:46:13.100520178Z","published":"2026-11-06T00:00:00Z","upstream":["CVE-2026-120749"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-120749"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-120749"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-120749"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2567978"},{"type":"REPORT","url":"https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/565"},{"type":"REPORT","url":"https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/592"},{"type":"REPORT","url":"https://gitlab.freedesktop.org/dbus/dbus/-/work_items/576"}],"affected":[{"package":{"name":"dbus","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/dbus?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.12-0ubuntu10","1.6.18-0ubuntu1","1.6.18-0ubuntu2","1.6.18-0ubuntu3","1.6.18-0ubuntu4","1.6.18-0ubuntu4.1","1.6.18-0ubuntu4.2","1.6.18-0ubuntu4.3","1.6.18-0ubuntu4.4","1.6.18-0ubuntu4.5","1.6.18-0ubuntu4.5+esm1","1.6.18-0ubuntu4.5+esm2","1.6.18-0ubuntu4.5+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"dbus","binary_version":"1.6.18-0ubuntu4.5+esm3"},{"binary_name":"dbus-x11","binary_version":"1.6.18-0ubuntu4.5+esm3"},{"binary_name":"libdbus-1-3","binary_version":"1.6.18-0ubuntu4.5+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120749.json"}},{"package":{"name":"dbus","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/dbus?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-1ubuntu1","1.10.4-1ubuntu2","1.10.6-1ubuntu1","1.10.6-1ubuntu2","1.10.6-1ubuntu3","1.10.6-1ubuntu3.1","1.10.6-1ubuntu3.3","1.10.6-1ubuntu3.4","1.10.6-1ubuntu3.5","1.10.6-1ubuntu3.6","1.10.6-1ubuntu3.6+esm1","1.10.6-1ubuntu3.6+esm2","1.10.6-1ubuntu3.6+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"dbus","binary_version":"1.10.6-1ubuntu3.6+esm3"},{"binary_name":"dbus-tests","binary_version":"1.10.6-1ubuntu3.6+esm3"},{"binary_name":"dbus-user-session","binary_version":"1.10.6-1ubuntu3.6+esm3"},{"binary_name":"dbus-x11","binary_version":"1.10.6-1ubuntu3.6+esm3"},{"binary_name":"libdbus-1-3","binary_version":"1.10.6-1ubuntu3.6+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120749.json"}},{"package":{"name":"dbus","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dbus?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.22-1ubuntu1","1.12.0-1ubuntu1","1.12.2-1ubuntu1","1.12.2-1ubuntu1.1","1.12.2-1ubuntu1.2","1.12.2-1ubuntu1.3","1.12.2-1ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_name":"dbus","binary_version":"1.12.2-1ubuntu1.4"},{"binary_name":"dbus-tests","binary_version":"1.12.2-1ubuntu1.4"},{"binary_version":"1.12.2-1ubuntu1.4","binary_name":"dbus-user-session"},{"binary_name":"dbus-x11","binary_version":"1.12.2-1ubuntu1.4"},{"binary_name":"libdbus-1-3","binary_version":"1.12.2-1ubuntu1.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120749.json"}},{"package":{"name":"dbus","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dbus?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12.14-1ubuntu2","1.12.16-2ubuntu1","1.12.16-2ubuntu2","1.12.16-2ubuntu2.1","1.12.16-2ubuntu2.2","1.12.16-2ubuntu2.3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.12.16-2ubuntu2.3","binary_name":"dbus"},{"binary_name":"dbus-tests","binary_version":"1.12.16-2ubuntu2.3"},{"binary_name":"dbus-user-session","binary_version":"1.12.16-2ubuntu2.3"},{"binary_version":"1.12.16-2ubuntu2.3","binary_name":"dbus-x11"},{"binary_name":"libdbus-1-3","binary_version":"1.12.16-2ubuntu2.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120749.json"}},{"package":{"name":"dbus","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/dbus?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12.20-2ubuntu2","1.12.20-2ubuntu3","1.12.20-2ubuntu4","1.12.20-2ubuntu4.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.12.20-2ubuntu4.1","binary_name":"dbus"},{"binary_name":"dbus-tests","binary_version":"1.12.20-2ubuntu4.1"},{"binary_name":"dbus-user-session","binary_version":"1.12.20-2ubuntu4.1"},{"binary_name":"dbus-x11","binary_version":"1.12.20-2ubuntu4.1"},{"binary_version":"1.12.20-2ubuntu4.1","binary_name":"libdbus-1-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120749.json"}},{"package":{"name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