{"id":"CVE-2026-35683","kind":"vulnerability","aliases":["CVE-2026-35683"],"related":[],"title":"Intel Multi-Buffer Crypto for IPsec: local user code can crash the system","description":"Out-of-bounds write for some Intel(R) Multi-Buffer Crypto for IPSec within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an unauthenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (low) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.","summary":"Intel's Multi-Buffer Crypto library for IPsec has an out-of-bounds write that a local user-mode program can trigger. The result is a denial of service, with possible integrity impact per the CVSS vector.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","intel","ipsec","linux","local-access"],"not_affected_if":["library-not-installed","no-local-untrusted-users"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T17:17:42+00:00","first_seen_at":"2026-11-10T17:22:42+00:00","triaged_at":"2026-11-10T17:24:18+00:00","updated_at":"2026-11-10T17:24:18+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T17:24:18Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Intel Multi-Buffer Crypto for IPsec: local user code can crash the system","impact":"medium","summary":"Intel's Multi-Buffer Crypto library for IPsec has an out-of-bounds write that a local user-mode program can trigger. The result is a denial of service, with possible integrity impact per the CVSS vector.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["intel","ipsec","linux","local-access"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Local program crashes the service, possibly altering some memory.","analyst_note":"Find Intel's advisory and the affected and fixed versions of Multi-Buffer Crypto for IPsec; the NVD entry alone gives no ranges.","how_to_check":"- unknown","plain_action":"","product_name":"Intel Multi-Buffer Crypto for IPsec","needs_analyst":true,"not_affected_if":["no-local-untrusted-users","library-not-installed"],"who_is_affected":"Systems that run Intel Multi-Buffer Crypto for IPsec in user space, where untrusted local users or processes can call it. The sources do not name affected versions or which products bundle the library. Teams that do not run the library on shared hosts can likely skip it.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000727,"input_tokens":4667,"output_tokens":521,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':16A,19A '-35683':17A,20A '3':85C 'access':27B,119C 'adversari':96C 'allow':89C 'applic':87C 'attack':106C,121C 'avail':145C,160C 'bound':42B,71C 'buffer':4A,32B,79C 'code':10A 'combin':101C 'complex':105C 'confidenti':140C,155C 'crash':12A 'crypto':5A,33B,80C 'cve':15A,18A 'cvss':66B 'denial':57B,91C,109C 'enabl':108C 'high':146C 'impact':63B,138C,162C 'infrastructur':21B 'integr':62B,142C,157C 'intel':1A,22B,28B,75C 'interact':133C 'intern':127C 'ipsec':7A,23B,36B,82C 'knowledg':128C 'librari':34B 'linux':24B 'local':8A,26B,46B,118C 'local-access':25B 'low':104C,143C 'may':88C,107C,114C,137C 'mode':49B 'multi':3A,31B,78C 'multi-buff':2A,30B,77C 'none':141C,156C,158C,161C 'occur':116C 'out-of-bound':39B,68C 'per':64B 'possibl':61B 'potenti':115C,135C 'present':124C 'program':50B 'r':76C 'requir':122C,130C 'result':54B,113C,151C 'ring':84C 'servic':59B,93C,111C 'softwar':95C 'special':126C 'subsequ':153C 'system':14A,150C,154C 'trigger':52B 'unauthent':99C 'unprivileg':94C 'user':9A,48B,86C,100C,132C 'user-mod':47B 'vector':67B 'via':117C 'vulner':136C,149C 'within':83C 'without':125C 'write':43B,72C","nicknames":[],"mitigations":[],"who_affected":"Systems that run Intel Multi-Buffer Crypto for IPsec in user space, where untrusted local users or processes can call it. The sources do not name affected versions or which products bundle the library. Teams that do not run the library on shared hosts can likely skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","intel","ipsec","linux","localaccess","medium"],"campaign_type":null,"search_a":"'-2026':16A,19A '-35683':17A,20A 'buffer':4A 'code':10A 'crash':12A 'crypto':5A 'cve':15A,18A 'intel':1A 'ipsec':7A 'local':8A 'multi':3A 'multi-buff':2A 'system':14A 'user':9A","search_b":"'access':27B 'bound':42B 'buffer':32B 'crypto':33B 'cvss':66B 'denial':57B 'impact':63B 'infrastructur':21B 'integr':62B 'intel':22B,28B 'ipsec':23B,36B 'librari':34B 'linux':24B 'local':26B,46B 'local-access':25B 'mode':49B 'multi':31B 'multi-buff':30B 'out-of-bound':39B 'per':64B 'possibl':61B 'program':50B 'result':54B 'servic':59B 'trigger':52B 'user':48B 'user-mod':47B 'vector':67B 'write':43B","search_c":"'3':85C 'access':119C 'adversari':96C 'allow':89C 'applic':87C 'attack':106C,121C 'avail':145C,160C 'bound':71C 'buffer':79C 'combin':101C 'complex':105C 'confidenti':140C,155C 'crypto':80C 'denial':91C,109C 'enabl':108C 'high':146C 'impact':138C,162C 'integr':142C,157C 'intel':75C 'interact':133C 'intern':127C 'ipsec':82C 'knowledg':128C 'local':118C 'low':104C,143C 'may':88C,107C,114C,137C 'multi':78C 'multi-buff':77C 'none':141C,156C,158C,161C 'occur':116C 'out-of-bound':68C 'potenti':115C,135C 'present':124C 'r':76C 'requir':122C,130C 'result':113C,151C 'ring':84C 'servic':93C,111C 'softwar':95C 'special':126C 'subsequ':153C 'system':150C,154C 'unauthent':99C 'unprivileg':94C 'user':86C,100C,132C 'via':117C 'vulner':136C,149C 'within':83C 'without':125C 'write':72C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T17:17:42+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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":"secure@intel.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-35683","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35683","severity":null,"published_at":"2026-11-10T17:17:42+00:00","modified_at":"2026-11-10T17:17:42+00:00","first_seen_at":"2026-11-10T17:22:42+00:00","fetched_at":"2026-11-10T17:22:42+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"}