{"id":"CVE-2026-102703","kind":"vulnerability","aliases":["CVE-2026-102703"],"related":[],"title":"Xen: grant copy caching can mix frame numbers and grant references","description":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nA common access pattern is a batch of Grant Copy operations acting on\nadjacent address ranges in the same source or destination page.  For\nperformance reasons, Xen caches details internally to reuse already\nvalidated data.  The conditions on when to re-validate the internal data\nwere not correct in some cases:\n\n - Frame numbers and grant references could wrongly be mixed up.  This\n   is CVE-2026-102703.\n\n - Copying by frame number (rather than grant reference) is permitted\n   only when operating on the caller's own memory.  The check to enforce\n   this restriction was misplaced.  This is CVE-2026-102704.","summary":"Xen caches validated data during batched grant copy operations, and the re-validation conditions were wrong in some cases. The NVD record says frame numbers and grant references could be wrongly mixed up, which the sources do not tie to a specific memory outcome.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["hypervisor","infrastructure","virtualization","xen"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-04T11:17:07+00:00","first_seen_at":"2026-11-04T11:26:45+00:00","triaged_at":"2026-11-04T11:27:51+00:00","updated_at":"2026-11-04T11:27:51+00:00","category":"infrastructure","confidence":0.3,"triage":{"at":"2026-11-04T11:27:51Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Xen: grant copy caching can mix frame numbers and grant references","impact":"medium","summary":"Xen caches validated data during batched grant copy operations, and the re-validation conditions were wrong in some cases. The NVD record says frame numbers and grant references could be wrongly mixed up, which the sources do not tie to a specific memory outcome.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["xen","hypervisor","virtualization"],"confidence":0.3,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unknown; impact not stated in the sources","analyst_note":"The NVD record is a multi-CVE CNA summary with no scores, versions or fix; check Xen security advisories for affected versions, the fixed release and the impact of the grant copy flaw.","how_to_check":"- unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000622,"input_tokens":4267,"output_tokens":390,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-102703':14A,17A,150C '-102704':182C '-2026':13A,16A,149C,181C 'access':86C 'act':95C 'address':98C 'adjac':97C 'alreadi':116C 'aspects/vulnerabilities':79C 'batch':27B,90C 'cach':4A,23B,111C 'caller':166C 'case':41B,135C 'check':171C 'cna':68C 'common':85C 'condit':36B,120C 'copi':3A,29B,93C,151C 'correct':132C 'correspond':80C 'could':51B,141C 'cve':12A,15A,83C,148C,180C 'cves':74C 'data':25B,118C,129C 'destin':105C 'detail':112C 'enforc':173C 'explain':77C 'frame':7A,46B,136C,153C 'grant':2A,10A,28B,49B,92C,139C,157C 'hypervisor':18B 'inform':69C 'infrastructur':19B 'intern':113C,128C 'memori':65B,169C 'misplac':177C 'mix':6A,54B,144C 'multipl':73C 'number':8A,47B,137C,154C 'nvd':43B 'oper':30B,94C,163C 'outcom':66B 'page':106C 'pattern':87C 'perform':108C 'permit':160C 'rang':99C 'rather':155C 're':34B,125C 're-valid':33B,124C 'reason':109C 'record':44B,70C 'refer':11A,50B,140C,158C 'relat':71C 'restrict':175C 'reus':115C 'say':45B 'sourc':58B,103C 'specif':64B 'text':76C 'tie':61B 'valid':24B,35B,117C,126C 'virtual':20B 'wrong':38B,53B,142C 'xen':1A,21B,22B,110C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["hypervisor","infrastructure","unknown","virtualization","xen"],"campaign_type":null,"first_public_at":"2026-11-04T11:17:07+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-102703","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102703","severity":null,"published_at":"2026-11-04T11:17:07+00:00","modified_at":"2026-11-04T11:17:07+00:00","first_seen_at":"2026-11-04T11:26:45+00:00","fetched_at":"2026-11-04T11:26:45+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"}