{"id":"CLSA-2026-1788793963","summary":"xorg-x11-server: Fix of 2 CVEs","details":"- CVE-2026-50256: fix stack buffer overflow in font alias resolution by raising XLFDMAXFONTNAMELEN to libXfont2's MAXFONTNAMELEN and bounds-checking resolved names\n- CVE-2026-50264: fix out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat by deduplicating attachments and tracking front buffers as booleans","modified":"2026-10-26T09:31:58.835961077Z","published":"2026-09-07T15:12:54Z","upstream":["CVE-2026-50256","CVE-2026-50264"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/rhel7els/CLSA-2026-1788793963.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50256"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50264"}],"affected":[{"package":{"name":"xorg-x11-server-Xdmx","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-Xdmx?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-Xephyr","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-Xephyr?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-Xnest","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-Xnest?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-Xorg","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-Xorg?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-Xvfb","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-Xvfb?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-Xwayland","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-Xwayland?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-common","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-common?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-devel","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-devel?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}},{"package":{"name":"xorg-x11-server-source","ecosystem":"TuxCare:RHEL:7","purl":"pkg:rpm/tuxcare/xorg-x11-server-source?distro=rhel-7"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.4-99.el7_9.tuxcare.els12"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788793963.json"}}],"schema_version":"1.9.0"}