{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392"
            },
            {
              "fixed": "e60afa01d35f8b2671b27ca93309921427144cce"
            },
            {
              "fixed": "67c72b8ef63d9d9a610546fda30b116638f39745"
            },
            {
              "fixed": "4489b4a17892750131e4bef4bc1d3d703c8fb5ba"
            },
            {
              "fixed": "43c7d0a6917751ea898ae584d00f24f5deac46d4"
            },
            {
              "fixed": "b5231ad0b376b801ab8cf2962b182cc29deaedb3"
            },
            {
              "fixed": "02226af69362758046822840fc6a497f5de33f00"
            },
            {
              "fixed": "3a60b5af75abe8e3494ccd074fb4ae6e601a3e55"
            },
            {
              "fixed": "afa58b7384913c8773d837acdb07b035690ec5d2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.20.0"
            },
            {
              "fixed": "5.10.265"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.216"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.152"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.104"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.45"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74694.json"
  },
  "details": "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() \u003e= sizeof(struct ncsi_pkt_hdr) is enforced.\n\nWith hdr-\u003elength 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.",
  "id": "CVE-2026-74694",
  "modified": "2026-08-24T11:36:05.894354065Z",
  "published": "2026-08-22T15:32:57.113Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74694.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74694"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length"
}