{"id":"CVE-2026-58757","kind":"vulnerability","aliases":["CVE-2026-58757"],"related":[],"title":"Linux kernel: heap overflow in MFC buffer allocation enables local privilege escalation","description":"In mfc_alloc_enc_roi_buffer of mfc_buf.c, there is a possible out-of-bounds write due to a heap buffer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.","summary":"A heap buffer overflow in the mfc_alloc_enc_roi_buffer function of the mfc_buf.c driver code allows an out-of-bounds write. A local user with no extra privileges could use it to escalate privileges.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","kernel","linux","local-users"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T20:19:24+00:00","first_seen_at":"2026-11-10T20:46:10+00:00","triaged_at":"2026-11-10T20:51:53+00:00","updated_at":"2026-11-10T20:51:53+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T20:51:53Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Linux kernel: heap overflow in MFC buffer allocation enables local privilege escalation","impact":"high","summary":"A heap buffer overflow in the mfc_alloc_enc_roi_buffer function of the mfc_buf.c driver code allows an out-of-bounds write. A local user with no extra privileges could use it to escalate privileges.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["linux","kernel","local-users"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"local user gains elevated privileges on the machine","analyst_note":"Confirm the affected kernel component and fixed kernel versions from the NVD entry and the upstream kernel commit; the sources do not name a product or version range.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000651,"input_tokens":4552,"output_tokens":392,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-58757':15A,18A 'addit':97C 'alloc':8A,32B,65C 'allow':43B 'bound':48B,79C 'buf.c':40B,71C 'buffer':7A,27B,35B,68C,85C 'code':42B 'could':57B,88C 'cve':13A,16A 'driver':41B 'due':81C 'enabl':9A 'enc':33B,66C 'escal':12A,61B,92C 'execut':98C 'exploit':107C 'extra':55B 'function':36B 'heap':3A,26B,84C 'infrastructur':19B 'interact':102C 'kernel':2A,20B 'lead':89C 'linux':1A,21B 'local':10A,23B,51B,91C 'local-us':22B 'mfc':6A,31B,39B,64C,70C 'need':100C,105C 'out-of-bound':45B,76C 'overflow':4A,28B,86C 'possibl':75C 'privileg':11A,56B,62B,94C,99C 'roi':34B,67C 'use':58B 'user':24B,52B,101C 'write':49B,80C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","kernel","linux","localusers","unknown"],"campaign_type":null,"search_a":"'-2026':14A,17A '-58757':15A,18A 'alloc':8A 'buffer':7A 'cve':13A,16A 'enabl':9A 'escal':12A 'heap':3A 'kernel':2A 'linux':1A 'local':10A 'mfc':6A 'overflow':4A 'privileg':11A","search_b":"'alloc':32B 'allow':43B 'bound':48B 'buf.c':40B 'buffer':27B,35B 'code':42B 'could':57B 'driver':41B 'enc':33B 'escal':61B 'extra':55B 'function':36B 'heap':26B 'infrastructur':19B 'kernel':20B 'linux':21B 'local':23B,51B 'local-us':22B 'mfc':31B,39B 'out-of-bound':45B 'overflow':28B 'privileg':56B,62B 'roi':34B 'use':58B 'user':24B,52B 'write':49B","search_c":"'addit':97C 'alloc':65C 'bound':79C 'buf.c':71C 'buffer':68C,85C 'could':88C 'due':81C 'enc':66C 'escal':92C 'execut':98C 'exploit':107C 'heap':84C 'interact':102C 'lead':89C 'local':91C 'mfc':64C,70C 'need':100C,105C 'out-of-bound':76C 'overflow':86C 'possibl':75C 'privileg':94C,99C 'roi':67C 'user':101C 'write':80C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T20:19:24+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-58757","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58757","severity":null,"published_at":"2026-11-10T20:19:24+00:00","modified_at":"2026-11-10T20:19:24+00:00","first_seen_at":"2026-11-10T20:46:10+00:00","fetched_at":"2026-11-10T20:46:10+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"}