{"id":"CVE-2026-109094","kind":"vulnerability","aliases":["CVE-2026-109094"],"related":[],"title":"X.Org X Server: integer overflow lets a client crash the display server","description":"A integer overflow that can lead to a buffer overrread in the XRes QueryResourceBytes Swap Path in the X.Org xwayland before 24.1.15 and X Server before 21.1.26 on 32bit systems could be used by authenticated clients to crash the X server.","summary":"An integer overflow in the XRes extension's QueryResourceBytes swap path causes an out-of-bounds read in X.Org xwayland before 24.1.15 and X Server before 21.1.26 on 32-bit systems. An authenticated client can use it to crash the X server.","severity":"high","cvss":8.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["32-bit","infrastructure","linux-desktop","x.org","xwayland"],"not_affected_if":["64-bit-systems","no-x-clients","patched-release"],"how_to_check":"- Run `Xorg -version` or `Xwayland -version` and compare the version to the fixed releases.\n- Check whether the system is 32-bit (for example with `uname -m`).","fix":"- X Server: move to `21.1.26` or later.\n- xwayland: move to `24.1.15` or later.","status":"open","published_at":"2026-11-13T15:17:30+00:00","first_seen_at":"2026-11-13T15:46:15+00:00","triaged_at":"2026-11-13T15:48:19+00:00","updated_at":"2026-11-13T15:48:19+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-13T15:48:19Z","model":"claude-haiku-5-5","output":{"fix":"- X Server: move to `21.1.26` or later.\n- xwayland: move to `24.1.15` or later.","reach":"local","title":"X.Org X Server: integer overflow lets a client crash the display server","impact":"low","summary":"An integer overflow in the XRes extension's QueryResourceBytes swap path causes an out-of-bounds read in X.Org xwayland before 24.1.15 and X Server before 21.1.26 on 32-bit systems. An authenticated client can use it to crash the X server.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["x.org","xwayland","linux-desktop","32-bit"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"A client crashes the X server, causing denial of service.","analyst_note":"","how_to_check":"- Run `Xorg -version` or `Xwayland -version` and compare the version to the fixed releases.\n- Check whether the system is 32-bit (for example with `uname -m`).","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["64-bit-systems","patched-release","no-x-clients"],"who_is_affected":"Affects X.Org X Server before 21.1.26 and xwayland before 24.1.15 on 32-bit systems. Systems on 64-bit hardware, or running patched releases, can skip it. Exposure needs an authenticated X client, so systems with no local or remote X clients are lower risk.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00073,"input_tokens":4550,"output_tokens":549,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-109094':15A,18A '-2026':14A,17A '21.1.26':54B,96C '24.1.15':49B,91C '32':19B,56B '32bit':98C 'authent':60B,104C 'bit':20B,57B 'bound':43B 'buffer':78C 'caus':38B 'client':8A,61B,105C 'could':100C 'crash':9A,66B,107C 'cve':13A,16A 'desktop':24B 'display':11A 'extens':33B 'infrastructur':21B 'integ':4A,28B,71C 'lead':75C 'let':6A 'linux':23B 'linux-desktop':22B 'out-of-bound':40B 'overflow':5A,29B,72C 'overrread':79C 'path':37B,85C 'queryresourcebyt':35B,83C 'read':44B 'server':3A,12A,52B,69B,94C,110C 'swap':36B,84C 'system':58B,99C 'use':63B,102C 'x':2A,51B,68B,93C,109C 'x.org':1A,25B,46B,88C 'xres':32B,82C 'xwayland':26B,47B,89C","nicknames":[],"mitigations":[],"who_affected":"Affects X.Org X Server before 21.1.26 and xwayland before 24.1.15 on 32-bit systems. Systems on 64-bit hardware, or running patched releases, can skip it. Exposure needs an authenticated X client, so systems with no local or remote X clients are lower risk.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["32bit","high","infrastructure","linuxdesktop","xorg","xwayland"],"campaign_type":null,"search_a":"'-109094':15A,18A '-2026':14A,17A 'client':8A 'crash':9A 'cve':13A,16A 'display':11A 'integ':4A 'let':6A 'overflow':5A 'server':3A,12A 'x':2A 'x.org':1A","search_b":"'21.1.26':54B '24.1.15':49B '32':19B,56B 'authent':60B 'bit':20B,57B 'bound':43B 'caus':38B 'client':61B 'crash':66B 'desktop':24B 'extens':33B 'infrastructur':21B 'integ':28B 'linux':23B 'linux-desktop':22B 'out-of-bound':40B 'overflow':29B 'path':37B 'queryresourcebyt':35B 'read':44B 'server':52B,69B 'swap':36B 'system':58B 'use':63B 'x':51B,68B 'x.org':25B,46B 'xres':32B 'xwayland':26B,47B","search_c":"'21.1.26':96C '24.1.15':91C '32bit':98C 'authent':104C 'buffer':78C 'client':105C 'could':100C 'crash':107C 'integ':71C 'lead':75C 'overflow':72C 'overrread':79C 'path':85C 'queryresourcebyt':83C 'server':94C,110C 'swap':84C 'system':99C 'use':102C 'x':93C,109C 'x.org':88C 'xres':82C 'xwayland':89C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T15:17:30+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"meissner@suse.de","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-109094","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109094","severity":null,"published_at":"2026-11-13T15:17:30+00:00","modified_at":"2026-11-13T15:17:30+00:00","first_seen_at":"2026-11-13T15:46:15+00:00","fetched_at":"2026-11-13T15:46:15+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"}