{"id":"CVE-2026-50079","kind":"vulnerability","aliases":["CVE-2026-50079"],"related":[],"title":"QEMU virtio network device race lets a guest crash the virtual machine","description":"Time-of-check Time-of-use (TOCTOU) Race Condition in the virtio network virtual device could allow an attacker in the guest to manipulate the virtual network device causing a crash of the QVM.","summary":"A race condition between checking and using data in the virtio network virtual device lets a guest-side attacker manipulate that device. The flaw can crash the QVM, the virtual machine.","severity":"low","cvss":3.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","qvm","virtio","virtualization"],"not_affected_if":["no-virtual-machines"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T20:19:12+00:00","first_seen_at":"2026-11-10T20:46:05+00:00","triaged_at":"2026-11-10T20:48:16+00:00","updated_at":"2026-11-10T20:48:16+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T20:48:16Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"QEMU virtio network device race lets a guest crash the virtual machine","impact":"low","summary":"A race condition between checking and using data in the virtio network virtual device lets a guest-side attacker manipulate that device. The flaw can crash the QVM, the virtual machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["virtualization","virtio","qvm"],"confidence":0.4,"fix_status":"unknown","needs_auth":"yes","worst_case":"A guest attacker crashes the virtual machine.","analyst_note":"Identify which hypervisor or QVM product ships this virtio network device and which versions are affected and fixed; check the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-50079.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-virtual-machines"],"who_is_affected":"Hosts that run virtual machines with virtio network devices are the ones to look at, since the attacker must already control a guest. The sources do not name the affected product versions or confirm which hypervisor ships the device, so the exposure of any given host is unknown.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000682,"input_tokens":4527,"output_tokens":458,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-50079':15A,18A 'allow':73C 'attack':42B,75C 'caus':85C 'check':27B,58C 'condit':25B,65C 'could':72C 'crash':9A,49B,87C 'cve':13A,16A 'data':30B 'devic':4A,36B,45B,71C,84C 'flaw':47B 'guest':8A,40B,78C 'guest-sid':39B 'infrastructur':19B 'let':6A,37B 'machin':12A,54B 'manipul':43B,80C 'network':3A,34B,69C,83C 'qemu':1A 'qvm':20B,51B,90C 'race':5A,24B,64C 'side':41B 'time':56C,60C 'time-of-check':55C 'time-of-us':59C 'toctou':63C 'use':29B,62C 'virtio':2A,21B,33B,68C 'virtual':11A,22B,35B,53B,70C,82C","nicknames":[],"mitigations":[],"who_affected":"Hosts that run virtual machines with virtio network devices are the ones to look at, since the attacker must already control a guest. The sources do not name the affected product versions or confirm which hypervisor ships the device, so the exposure of any given host is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","low","qvm","virtio","virtualization"],"campaign_type":null,"search_a":"'-2026':14A,17A '-50079':15A,18A 'crash':9A 'cve':13A,16A 'devic':4A 'guest':8A 'let':6A 'machin':12A 'network':3A 'qemu':1A 'race':5A 'virtio':2A 'virtual':11A","search_b":"'attack':42B 'check':27B 'condit':25B 'crash':49B 'data':30B 'devic':36B,45B 'flaw':47B 'guest':40B 'guest-sid':39B 'infrastructur':19B 'let':37B 'machin':54B 'manipul':43B 'network':34B 'qvm':20B,51B 'race':24B 'side':41B 'use':29B 'virtio':21B,33B 'virtual':22B,35B,53B","search_c":"'allow':73C 'attack':75C 'caus':85C 'check':58C 'condit':65C 'could':72C 'crash':87C 'devic':71C,84C 'guest':78C 'manipul':80C 'network':69C,83C 'qvm':90C 'race':64C 'time':56C,60C 'time-of-check':55C 'time-of-us':59C 'toctou':63C 'use':62C 'virtio':68C 'virtual':70C,82C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T20:19:12+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","cvss_by":"secure@blackberry.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-50079","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50079","severity":null,"published_at":"2026-11-10T20:19:12+00:00","modified_at":"2026-11-10T20:19:12+00:00","first_seen_at":"2026-11-10T20:46:05+00:00","fetched_at":"2026-11-10T20:46:05+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"}