{"api_version":"1","generated_at":"2026-08-22T18:34:24+00:00","cve":"CVE-2026-74694","urls":{"html":"https://cve.report/CVE-2026-74694","api":"https://cve.report/api/cve/CVE-2026-74694.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74694","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74694"},"summary":{"title":"net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:43","updated_at":"2026-08-22 16:16:43"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745","name":"https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55","name":"https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce","name":"https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba","name":"https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4","name":"https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00","name":"https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3","name":"https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2","name":"https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74694","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74694","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 e60afa01d35f8b2671b27ca93309921427144cce git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 67c72b8ef63d9d9a610546fda30b116638f39745 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 4489b4a17892750131e4bef4bc1d3d703c8fb5ba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 43c7d0a6917751ea898ae584d00f24f5deac46d4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * 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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."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:32:57.113Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce"},{"url":"https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745"},{"url":"https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba"},{"url":"https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4"},{"url":"https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3"},{"url":"https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00"},{"url":"https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55"},{"url":"https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2"}],"title":"net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74694","datePublished":"2026-08-22T15:32:57.113Z","dateReserved":"2026-08-15T05:44:03.926Z","dateUpdated":"2026-08-22T15:32:57.113Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:43","lastModifiedDate":"2026-08-22 16:16:43","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74694","Ordinal":"1","Title":"net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length","CVE":"CVE-2026-74694","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74694","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length"}]}}}