{"id":"CVE-2026-98618","kind":"vulnerability","aliases":["CVE-2026-98618"],"related":[],"title":"Linux kernel: fbnic driver NULL dereference with maximum standalone channels","description":"In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: Handle maximum standalone channels\n\nStandalone channels use one NAPI vector for each Tx and Rx queue.\nfbnic's allocation path excludes FBNIC_MAX_TXQS from that layout. A\n64-Tx/64-Rx configuration therefore records 128 vectors but allocates\nonly 64, leaving NULL entries that resource setup dereferences.\n\nInclude the maximum vector count in standalone allocation.","summary":"In the Linux kernel's fbnic network driver, a 64-Tx/64-Rx standalone channel configuration allocates only 64 NAPI vectors while recording 128, leaving NULL entries that resource setup dereferences. The sources describe a crash path; they do not describe code execution or data access.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["fbnic","linux-kernel","network-driver","package"],"not_affected_if":["default-config","no-fbnic-hardware"],"how_to_check":"- unknown","fix":"- Move to a kernel build that includes the upstream fix titled 'eth: fbnic: Handle maximum standalone channels' (exact version not given in the sources)","status":"open","published_at":"2026-10-18T16:17:14+00:00","first_seen_at":"2026-10-23T21:57:16+00:00","triaged_at":"2026-10-25T05:21:17+00:00","updated_at":"2026-10-25T05:21:17+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-10-25T05:21:17Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a kernel build that includes the upstream fix titled 'eth: fbnic: Handle maximum standalone channels' (exact version not given in the sources)","reach":"local","title":"Linux kernel: fbnic driver NULL dereference with maximum standalone channels","impact":"low","summary":"In the Linux kernel's fbnic network driver, a 64-Tx/64-Rx standalone channel configuration allocates only 64 NAPI vectors while recording 128, leaving NULL entries that resource setup dereferences. The sources describe a crash path; they do not describe code execution or data access.","category":"package","nicknames":[],"who_cares":["linux-kernel","fbnic","network-driver"],"confidence":0.5,"needs_auth":"unknown","worst_case":"kernel NULL dereference during resource setup, likely crash","analyst_note":"Check the upstream kernel commit and NVD entry for the fixed version, and whether the crash is reachable without privileges.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["no-fbnic-hardware","default-config"],"who_is_affected":"Systems running a Linux kernel that includes the fbnic driver and configure 64 Tx and 64 Rx standalone channels. The sources do not say whether default configurations hit this path.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000584,"input_tokens":3386,"output_tokens":491,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-98618':13A,16A '128':46B,114C '64':34B,41B,109C,119C 'access':68B 'alloc':39B,99C,117C,134C 'channel':10A,37B,84C,86C 'code':64B 'configur':38B,111C 'count':131C 'crash':58B 'cve':11A,14A 'data':67B 'derefer':6A,53B,126C 'describ':56B,63B 'driver':4A,23B,32B 'entri':49B,122C 'eth':79C 'exclud':101C 'execut':65B 'fbnic':3A,17B,30B,80C,97C,102C 'follow':74C 'handl':81C 'includ':127C 'kernel':2A,20B,28B,72C 'layout':107C 'leav':47B,120C 'linux':1A,19B,27B,71C 'linux-kernel':18B 'max':103C 'maximum':8A,82C,129C 'napi':42B,89C 'network':22B,31B 'network-driv':21B 'null':5A,48B,121C 'one':88C 'packag':24B 'path':59B,100C 'queue':96C 'record':45B,113C 'resolv':78C 'resourc':51B,124C 'rx':95C 'setup':52B,125C 'sourc':55B 'standalon':9A,36B,83C,85C,133C 'therefor':112C 'tx':93C 'tx/64-rx':35B,110C 'txqs':104C 'use':87C 'vector':43B,90C,115C,130C 'vulner':75C","nicknames":[],"mitigations":[],"who_affected":"Systems running a Linux kernel that includes the fbnic driver and configure 64 Tx and 64 Rx standalone channels. The sources do not say whether default configurations hit this path.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-18T16:17:14+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-98618","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98618","severity":null,"published_at":"2026-10-18T16:17:14+00:00","modified_at":"2026-10-19T10:19:25+00:00","first_seen_at":"2026-10-23T21:57:16+00:00","fetched_at":"2026-10-23T22:28:56+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"}