{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d014538aa38561cd24c5eb228223585f26c5ec71"
            },
            {
              "fixed": "a0fc1b9c738fba231f190ab960c83202722efee5"
            },
            {
              "fixed": "c59090c50f62a17129fc4c5407bc4071305a9e82"
            },
            {
              "fixed": "52db5ef163c96f916d424e472fb17aadc35a9f7a"
            },
            {
              "fixed": "b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"
            },
            {
              "fixed": "73a7a345816946d276ad2c46c8bb771de67cfc46"
            },
            {
              "fixed": "24a7b9daa103fa963b3fd37d8805b23e01621976"
            },
            {
              "fixed": "25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.167"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.19"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43380.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses 'data' as the destination and 'data_char' as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since 'data' is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized 'data_char' and writing to 'data', resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding 'data_char' to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call.",
  "id": "CVE-2026-43380",
  "modified": "2026-07-15T01:49:16.286380531Z",
  "published": "2026-05-08T14:21:28.702Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43380.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43380"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read"
}