{"schema_version": "1.7.0", "id": "RLSA-2026:26610", "modified": "2026-06-19T00:06:01.684045Z", "published": "2026-06-19T00:03:21.214998Z", "upstream": ["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"], "summary": "Important: xorg-x11-server security, bug fix, and enhancement update", "details": "X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.\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\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)\n\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\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\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)\n\nBug Fix(es) and Enhancement(s):\n\n* [xserver] Backport other security fixes without a CVE assigned [rhel-9.8.z] (JIRA:Rocky Linux-184288)\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.", "severity": [{"type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}], "affected": [{"package": {"ecosystem": "Rocky Linux:9", "name": "xorg-x11-server", "purl": "pkg:rpm/rocky-linux/xorg-x11-server?distro=rocky-linux-9&epoch=0"}, "ranges": [{"type": "ECOSYSTEM", "events": [{"introduced": "0"}, {"fixed": "0:1.20.11-34.el9_8.2"}], "database_specific": {"yum_repository": "AppStream"}}]}], "references": [{"type": "ADVISORY", "url": "https://errata.rockylinux.org/RLSA-2026:26610"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485380"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485382"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485383"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485384"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485385"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485386"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485387"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485388"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485389"}], "credits": [{"name": "Rocky Enterprise Software Foundation"}, {"name": "Red Hat"}]}