{"cve":"CVE-2026-74694","nvd":{"published":"2026-08-22T16:16:43.920","modified":"2026-10-14T13:10:00.187","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length\n\nncsi_send_cmd_nl() takes the number of bytes to copy from the\nattacker-controlled ncsi_pkt_hdr.length field of the in-band packet\nheader, while the source buffer is the NCSI_ATTR_DATA netlink\nattribute whose readable size is nla_len() - sizeof(ncsi_pkt_hdr).\nThe two length sources are never cross-checked: only\nnla_len() >= sizeof(struct ncsi_pkt_hdr) is enforced.\n\nWith hdr->length set larger than the attribute payload (up to 65535\nagainst at most 2032 readable bytes), ncsi_cmd_handler_oem() copies\npast the end of the netlink attribute buffer with unsafe_memcpy(),\nleaking up to ~64KB of kernel heap memory into the transmitted NCSI\ncommand packet. The destination skb is sized by the declared payload,\nso the write side does not overflow - this is a pure OOB read /\ninformation leak, reachable with CAP_NET_ADMIN on systems with a\nregistered NCSI device (e.g. OpenBMC on Aspeed BMC SoCs, where\nNET_NCSI=y is standard).\n\nReject commands whose declared payload extends past the end of the\ndata attribute.\n\nThe issue was found by the autokbug dynamic kernel fuzzer at Tencent\nYunding Lab.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00","https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55","https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4","https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba","https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-74694","score":0.00177,"percentile":0.07161,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}