{"id":"ALSA-2026:26562","summary":"Important: xorg-x11-server-Xwayland security, bug fix, and enhancement update","details":"Xwayland is an X server for running X clients under Wayland.  \n\nSecurity Fix(es):  \n\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * [xwayland] Backport other security fixes without a CVE assigned [almalinux-8.10.z] (JIRA:AlmaLinux-184293)\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","modified":"2026-06-17T15:15:04.668002654Z","published":"2026-06-17T00:00:00Z","related":["CVE-2026-50256","CVE-2026-50257","CVE-2026-50258","CVE-2026-50259","CVE-2026-50260","CVE-2026-50261","CVE-2026-50262","CVE-2026-50263","CVE-2026-50264"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26562"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50256"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50257"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50258"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50259"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50260"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50261"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50262"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50263"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50264"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485380"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485382"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485383"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485384"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485385"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485386"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485387"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485388"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485389"},{"type":"ADVISORY","url":"https://errata.almalinux.org/8/ALSA-2026-26562.html"}],"affected":[{"package":{"name":"xorg-x11-server-Xwayland","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/xorg-x11-server-Xwayland"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.1.3-20.el8_10.2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:26562.json"}}],"schema_version":"1.7.5"}