{"id":"CVE-2026-109091","kind":"vulnerability","aliases":["CVE-2026-109091"],"related":[],"title":"X.Org X Server and Xwayland: EDID display-range buffer overflow lets monitors crash or run code","description":"A buffer overflow in handling EDID Display-Range descriptors in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by malicious monitors to crash the x server or execute cote.","summary":"A buffer overflow in how X.Org X Server and Xwayland parse EDID display-range descriptors can be triggered by a malicious monitor. The sources say it can crash the X server or execute code.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"X.Org xwayland","fixed":[],"affected":"","ecosystem":"runtime"}],"ecosystems":["runtime"],"tags":["linux","runtime","x-server","x.org","xwayland"],"not_affected_if":["fixed-version"],"how_to_check":"- Check the installed X server version with `Xorg -version` or `Xwayland -version`\n- Compare it with the fixed ranges: Xwayland before `24.1.15` and X Server before `21.1.26` are affected","fix":"- Xwayland: `24.1.15`\n- X Server: `21.1.26`","status":"open","published_at":"2026-11-13T16:17:25+00:00","first_seen_at":"2026-11-13T16:47:32+00:00","triaged_at":"2026-11-13T16:48:31+00:00","updated_at":"2026-11-13T16:48:31+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-13T16:48:31Z","model":"claude-haiku-5-5","output":{"fix":"- Xwayland: `24.1.15`\n- X Server: `21.1.26`","reach":"local","title":"X.Org X Server and Xwayland: EDID display-range buffer overflow lets monitors crash or run code","impact":"high","summary":"A buffer overflow in how X.Org X Server and Xwayland parse EDID display-range descriptors can be triggered by a malicious monitor. The sources say it can crash the X server or execute code.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["linux","x.org","xwayland","x-server"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker-supplied monitor data can crash the X server or execute code","analyst_note":"Confirm the affected version ranges and the exact exploit conditions at the NVD entry https://nvd.nist.gov/vuln/detail/CVE-2026-109091, since the sources list no product data.","how_to_check":"- Check the installed X server version with `Xorg -version` or `Xwayland -version`\n- Compare it with the fixed ranges: Xwayland before `24.1.15` and X Server before `21.1.26` are affected\n- unknown for other checks, as the sources do not say","plain_action":"","product_name":"X.Org xwayland","needs_analyst":true,"not_affected_if":["fixed-version"],"who_is_affected":"Systems running X.Org X Server or Xwayland below the fixed versions are exposed when a display reports crafted EDID data. The sources do not say which configurations are most at risk, so unknown for narrower scoping. Teams on fixed versions or on systems with no X server can skip it.","user_interaction":"unknown","product_ecosystem":"runtime","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000767,"input_tokens":4533,"output_tokens":628,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-109091':20A,23A '-2026':19A,22A '21.1.26':87C '24.1.15':82C 'buffer':10A,34B,69C 'code':17A,67B 'cote':101C 'could':88C 'crash':14A,61B,95C 'cve':18A,21A 'descriptor':48B,77C 'display':8A,46B,75C 'display-rang':7A,45B,74C 'edid':6A,44B,73C 'execut':66B,100C 'handl':72C 'let':12A 'linux':26B 'malici':54B,92C 'monitor':13A,55B,93C 'overflow':11A,35B,70C 'pars':43B 'rang':9A,47B,76C 'run':16A 'runtim':27B 'say':58B 'server':3A,30B,40B,64B,85C,98C 'sourc':57B 'trigger':51B 'use':90C 'x':2A,29B,39B,63B,84C,97C 'x-server':28B 'x.org':1A,24A,31B,38B,79C 'xwayland':5A,25A,32B,42B,80C","nicknames":[],"mitigations":[],"who_affected":"Systems running X.Org X Server or Xwayland below the fixed versions are exposed when a display reports crafted EDID data. The sources do not say which configurations are most at risk, so unknown for narrower scoping. Teams on fixed versions or on systems with no X server can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["xorgxwayland","xwayland"],"ptokens":["org","xwayland"],"labels":["high","linux","runtime","xorg","xserver","xwayland"],"campaign_type":null,"search_a":"'-109091':20A,23A '-2026':19A,22A 'buffer':10A 'code':17A 'crash':14A 'cve':18A,21A 'display':8A 'display-rang':7A 'edid':6A 'let':12A 'monitor':13A 'overflow':11A 'rang':9A 'run':16A 'server':3A 'x':2A 'x.org':1A,24A 'xwayland':5A,25A","search_b":"'buffer':34B 'code':67B 'crash':61B 'descriptor':48B 'display':46B 'display-rang':45B 'edid':44B 'execut':66B 'linux':26B 'malici':54B 'monitor':55B 'overflow':35B 'pars':43B 'rang':47B 'runtim':27B 'say':58B 'server':30B,40B,64B 'sourc':57B 'trigger':51B 'x':29B,39B,63B 'x-server':28B 'x.org':31B,38B 'xwayland':32B,42B","search_c":"'21.1.26':87C '24.1.15':82C 'buffer':69C 'cote':101C 'could':88C 'crash':95C 'descriptor':77C 'display':75C 'display-rang':74C 'edid':73C 'execut':100C 'handl':72C 'malici':92C 'monitor':93C 'overflow':70C 'rang':76C 'server':85C,98C 'use':90C 'x':84C,97C 'x.org':79C 'xwayland':80C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T16:17:25+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"meissner@suse.de","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-109091","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109091","severity":null,"published_at":"2026-11-13T16:17:25+00:00","modified_at":"2026-11-13T16:17:25+00:00","first_seen_at":"2026-11-13T16:47:32+00:00","fetched_at":"2026-11-13T16:47:32+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}