{"id":"CVE-2026-93536","kind":"vulnerability","aliases":["CVE-2026-93536"],"related":[],"title":"X.Org X Server: use-after-free in gesture sprites lets clients crash it","description":"A use after free caused by missing lifecycle management of gesture sprites in GestureBuildSprite() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash the X server or potentially execute code.","summary":"A use-after-free in GestureBuildSprite() in the X.Org X Server and XWayland lets an authenticated X client crash the server. The description says it could also potentially execute code.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","linux-desktop","self-hosted","x.org","xwayland"],"not_affected_if":["no-x-server","unauthenticated-clients-blocked","wayland-only"],"how_to_check":"- Run `Xorg -version` or `X -version` and compare against `21.1.25`\n- Run `Xwayland -version` and compare against `24.1.14`","fix":"- Upgrade X.Org X Server to `21.1.25` or later\n- Upgrade XWayland to `24.1.14` or later","status":"open","published_at":"2026-10-28T17:18:53+00:00","first_seen_at":"2026-10-28T17:34:10+00:00","triaged_at":"2026-10-28T17:36:28+00:00","updated_at":"2026-10-28T17:36:28+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-28T17:36:28Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade X.Org X Server to `21.1.25` or later\n- Upgrade XWayland to `24.1.14` or later","reach":"local","title":"X.Org X Server: use-after-free in gesture sprites lets clients crash it","impact":"medium","summary":"A use-after-free in GestureBuildSprite() in the X.Org X Server and XWayland lets an authenticated X client crash the server. The description says it could also potentially execute code.","category":"infrastructure","nicknames":[],"who_cares":["x.org","xwayland","linux-desktop","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Denial of service for the X server, and possibly code execution","analyst_note":"Check the upstream X.Org security advisory for whether code execution is confirmed or only theoretical, and confirm the fixed versions.","how_to_check":"- Run `Xorg -version` or `X -version` and compare against `21.1.25`\n- Run `Xwayland -version` and compare against `24.1.14`","needs_analyst":true,"not_affected_if":["no-x-server","wayland-only","unauthenticated-clients-blocked"],"who_is_affected":"X.Org X Server before 21.1.25 and XWayland before 24.1.14 are affected. The attacker must already be an authenticated X client connected to the server. Systems that run only Wayland without XWayland, or that do not run an X server at all, can skip it.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000598,"input_tokens":3309,"output_tokens":535,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-93536':16A,19A '21.1.25':79C '24.1.14':83C 'also':56B 'authent':45B,88C 'caus':64C 'client':12A,47B,90C 'code':59B,99C 'could':55B,84C 'crash':13A,48B,92C 'cve':14A,17A 'descript':52B 'desktop':23B 'execut':58B,98C 'free':7A,33B,63C 'gestur':9A,70C 'gesturebuildsprit':35B,73C 'host':26B 'infrastructur':20B 'let':11A,43B 'lifecycl':67C 'linux':22B 'linux-desktop':21B 'manag':68C 'miss':66C 'potenti':57B,97C 'say':53B 'self':25B 'self-host':24B 'server':3A,40B,50B,77C,95C 'sprite':10A,71C 'use':5A,31B,61C,86C 'use-after-fre':4A,30B 'x':2A,39B,46B,76C,89C,94C 'x.org':1A,27B,38B,75C 'xwayland':28B,42B,81C","nicknames":[],"mitigations":[],"who_affected":"X.Org X Server before 21.1.25 and XWayland before 24.1.14 are affected. The attacker must already be an authenticated X client connected to the server. Systems that run only Wayland without XWayland, or that do not run an X server at all, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T17:18:53+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H","cvss_by":"meissner@suse.de","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-93536","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93536","severity":null,"published_at":"2026-10-28T17:18:53+00:00","modified_at":"2026-10-28T17:18:53+00:00","first_seen_at":"2026-10-28T17:34:10+00:00","fetched_at":"2026-10-28T17:34:10+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}