FKIE_CVE-2026-74694

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-22 16:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length ncsi_send_cmd_nl() takes the number of bytes to copy from the attacker-controlled ncsi_pkt_hdr.length field of the in-band packet header, while the source buffer is the NCSI_ATTR_DATA netlink attribute whose readable size is nla_len() - sizeof(ncsi_pkt_hdr). The two length sources are never cross-checked: only nla_len() >= sizeof(struct ncsi_pkt_hdr) is enforced. With hdr->length set larger than the attribute payload (up to 65535 against at most 2032 readable bytes), ncsi_cmd_handler_oem() copies past the end of the netlink attribute buffer with unsafe_memcpy(), leaking up to ~64KB of kernel heap memory into the transmitted NCSI command packet. The destination skb is sized by the declared payload, so the write side does not overflow - this is a pure OOB read / information leak, reachable with CAP_NET_ADMIN on systems with a registered NCSI device (e.g. OpenBMC on Aspeed BMC SoCs, where NET_NCSI=y is standard). Reject commands whose declared payload extends past the end of the data attribute. The issue was found by the autokbug dynamic kernel fuzzer at Tencent Yunding Lab.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ncsi/ncsi-netlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e60afa01d35f8b2671b27ca93309921427144cce",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "67c72b8ef63d9d9a610546fda30b116638f39745",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "4489b4a17892750131e4bef4bc1d3d703c8fb5ba",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "43c7d0a6917751ea898ae584d00f24f5deac46d4",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "b5231ad0b376b801ab8cf2962b182cc29deaedb3",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "02226af69362758046822840fc6a497f5de33f00",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "3a60b5af75abe8e3494ccd074fb4ae6e601a3e55",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            },
            {
              "lessThan": "afa58b7384913c8773d837acdb07b035690ec5d2",
              "status": "affected",
              "version": "9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ncsi/ncsi-netlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-08-22T16:16:43.920",
  "metrics": {},
  "published": "2026-08-22T16:16:43.920",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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