{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "271907ee2f29cd1078fd219f0778fd824fb1971c"
            },
            {
              "fixed": "5be4eebd5a3a198dab0adcd550e1cadca79bdfed"
            },
            {
              "fixed": "87b39a8c875ca744b7de69af0a8ef8874cffccf1"
            },
            {
              "fixed": "88b2a16ddac3357e3f1d528e758b51e2c945d546"
            },
            {
              "fixed": "11c057d23465c7a5817a7284c896d19d54c0b616"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.18.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68293.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Fix MCIA register buffer overflow on 32 dword reads\n\nThe MCIA register can return up to 32 dwords (128 bytes) when the device\nadvertises the mcia_32dwords capability, but struct\nmlx5_ifc_mcia_reg_bits only defines dword_0..11, leaving room for just\n12 dwords (48 bytes) of data.\n\nmlx5_query_mcia() clamps the read size to mlx5_mcia_max_bytes() and then\nmemcpy()s that many bytes out of the register, potentially reading past\nthe end of the 'out' buffer. On kernels built with FORTIFY_SOURCE this\nis caught as a buffer overflow while reading the module EEPROM via\nethtool:\n\n  detected buffer overflow in memcpy\n  kernel BUG at lib/string_helpers.c:1048!\n  RIP: 0010:fortify_panic+0x13/0x20\n  Call Trace:\n   mlx5_query_mcia.isra.0+0x200/0x210 [mlx5_core]\n   mlx5_query_module_eeprom_by_page+0x4a/0xa0 [mlx5_core]\n   mlx5e_get_module_eeprom_by_page+0xbb/0x120 [mlx5_core]\n   eeprom_prepare_data+0xf3/0x170\n   ethnl_default_doit+0xf1/0x3b0\n\nExtend the mcia_reg layout to 32 dwords.",
  "id": "CVE-2026-68293",
  "modified": "2026-08-12T03:51:25.886464565Z",
  "published": "2026-08-10T12:02:26.414Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11c057d23465c7a5817a7284c896d19d54c0b616"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5be4eebd5a3a198dab0adcd550e1cadca79bdfed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87b39a8c875ca744b7de69af0a8ef8874cffccf1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88b2a16ddac3357e3f1d528e758b51e2c945d546"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68293.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68293"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/mlx5: Fix MCIA register buffer overflow on 32 dword reads"
}