vdpa/mlx5: Fix buffer length in create_direct_keys()

{
  "id": "7cef6f100eb536c80639069f012a32cda3a5132f463cbcf69382b3b68de514b3",
  "url": "https://osv.dev/vulnerability/CVE-2026-74712",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vdpa/mlx5: Fix buffer length in create_direct_keys()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vdpa/mlx5: Fix buffer length in create_direct_keys() We have seen in our CI the following KASAN message: BUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core] Read of size 272 at addr 0000000176795020 by task qemu-system-s39/82764 [...] [<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core] [<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core] [<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa] [<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa] [...] The buggy address is located 4128 bytes inside of allocated 4384-byte region [0000000176794000, 0000000176795120) So in essence we read 16 bytes beyond 4384-byte allocation. create_direct_keys calculates the pointer and length for in and out buffers. The size calculation for in includes the entire structure size (out + in + mtt[]) but the pointer passed to cmd_exec points only to the 'in' field, skipping the 'out' field. This causes mlx5_copy_to_msg() to read beyond the allocated buffer by sizeof(out) bytes when copying command data. Properly calculate the input size to match the pointer and allocation size.",
    "evidence": "osv:CVE-2026-74712",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.104",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-74712",
      "aliases": [
        "CVE-2026-74712"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0071b138d44af4296bf871e6624369ce697b4b15"
                },
                {
                  "fixed": "ec3bb289cf19d526224117d5d450a5fd9cbd5ab2"
                },
                {
                  "fixed": "cde8931a25392670dd59a0acfcab87a830ab66c5"
                },
                {
                  "fixed": "6c8a9f7bc00301e533a5366384f3070a8e7f8430"
                },
                {
                  "fixed": "727e1f569855df83579edbd73dcb4a0723543a12"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74712.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.0"
                },
                {
                  "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"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74712.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.122234620Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430",
        "https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12",
        "https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5",
        "https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74712.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74712",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74712.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74712",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504038,
  "published_at": "2026-08-22T15:33:08.392+00:00"
}