{"id":"CVE-2026-100082","kind":"vulnerability","aliases":["CVE-2026-100082"],"related":[],"title":"Linux kernel: Xen block backend reads freed I/O statistics data","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-blkback: Avoid UAF when reading I/O statistics\n\nReading I/O statistics via sysfs concurrently with tearing down a\nfrontend device might result in UAF or a NULL dereference, as the\nreading of the statistics data is not synchronized with freeing the\ndata.\n\nUse a rwlock for synchronizing.\n\nThis is XSA-528 / CVE-2026-100082","summary":"Reading I/O statistics through sysfs while a Xen frontend device is being torn down can use freed memory or dereference a NULL pointer. The sources do not state what an attacker gets beyond a crash or memory corruption.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","linux-kernel","xen","xen-blkback"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-06T19:17:03+00:00","first_seen_at":"2026-11-06T19:43:48+00:00","triaged_at":"2026-11-06T19:46:19+00:00","updated_at":"2026-11-06T19:46:20+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-06T19:46:19Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Linux kernel: Xen block backend reads freed I/O statistics data","impact":"medium","summary":"Reading I/O statistics through sysfs while a Xen frontend device is being torn down can use freed memory or dereference a NULL pointer. The sources do not state what an attacker gets beyond a crash or memory corruption.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["linux-kernel","xen","xen-blkback"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unknown; memory use-after-free or NULL dereference in kernel","analyst_note":"Check the kernel stable-tree commits and XSA-528 advisory for affected kernel ranges and the fixed versions.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000615,"input_tokens":4273,"output_tokens":375,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-100082':13A,16A,127C '-2026':12A,15A,126C '-528':124C 'attack':55B 'avoid':76C 'backend':5A 'beyond':57B 'blkback':24B,75C 'block':4A 'concurr':87C 'corrupt':62B 'crash':59B 'cve':11A,14A,125C 'data':10A,108C,115C 'derefer':44B,101C 'devic':34B,93C 'follow':68C 'free':113C 'freed':7A,41B 'frontend':33B,92C 'get':56B 'i/o':8A,26B,80C,83C 'infrastructur':17B 'kernel':2A,20B,66C 'linux':1A,19B,65C 'linux-kernel':18B 'memori':42B,61B 'might':94C 'null':46B,100C 'pointer':47B 'read':6A,25B,79C,82C,104C 'resolv':72C 'result':95C 'rwlock':118C 'sourc':49B 'state':52B 'statist':9A,27B,81C,84C,107C 'synchron':111C,120C 'sysf':29B,86C 'tear':89C 'torn':37B 'uaf':77C,97C 'use':40B,116C 'via':85C 'vulner':69C 'xen':3A,21B,23B,32B,74C 'xen-blkback':22B,73C 'xsa':123C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","linuxkernel","unknown","xen","xenblkback"],"campaign_type":null,"search_a":"'-100082':13A,16A '-2026':12A,15A 'backend':5A 'block':4A 'cve':11A,14A 'data':10A 'freed':7A 'i/o':8A 'kernel':2A 'linux':1A 'read':6A 'statist':9A 'xen':3A","search_b":"'attack':55B 'beyond':57B 'blkback':24B 'corrupt':62B 'crash':59B 'derefer':44B 'devic':34B 'freed':41B 'frontend':33B 'get':56B 'i/o':26B 'infrastructur':17B 'kernel':20B 'linux':19B 'linux-kernel':18B 'memori':42B,61B 'null':46B 'pointer':47B 'read':25B 'sourc':49B 'state':52B 'statist':27B 'sysf':29B 'torn':37B 'use':40B 'xen':21B,23B,32B 'xen-blkback':22B","search_c":"'-100082':127C '-2026':126C '-528':124C 'avoid':76C 'blkback':75C 'concurr':87C 'cve':125C 'data':108C,115C 'derefer':101C 'devic':93C 'follow':68C 'free':113C 'frontend':92C 'i/o':80C,83C 'kernel':66C 'linux':65C 'might':94C 'null':100C 'read':79C,82C,104C 'resolv':72C 'result':95C 'rwlock':118C 'statist':81C,84C,107C 'synchron':111C,120C 'sysf':86C 'tear':89C 'uaf':77C,97C 'use':116C 'via':85C 'vulner':69C 'xen':74C 'xen-blkback':73C 'xsa':123C","first_public_at":"2026-11-06T19:17:03+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-100082","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100082","severity":null,"published_at":"2026-11-06T19:17:03+00:00","modified_at":"2026-11-06T19:17:03+00:00","first_seen_at":"2026-11-06T19:43:48+00:00","fetched_at":"2026-11-06T19:43:48+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}