{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a"
            },
            {
              "fixed": "016ef0f6ca4bc9bf0330ac41bd2ea349759643e3"
            },
            {
              "fixed": "c882e8cc68fb993700dc21fd6e754001e6297934"
            },
            {
              "fixed": "6d2c973926d0612360693bc559be2ffde836151b"
            },
            {
              "fixed": "60ed00d46616a9232e42ea7a3e3c0273d7cf7543"
            },
            {
              "fixed": "cb2fc37857693b55909fb77dc2c87cfbc1cdc476"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.16.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72142.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: imx: fix locked bus on SMBus block-read of 0 (atomic)\n\nSMBus 3.1 6.5.7 allows a Block Read byte count of 0, but the atomic\n(polling) path rejects it as -EPROTO. Worse, it returns without a\nNACK+STOP: the next receive cycle has already started, so the target\nkeeps holding SDA and the bus stays stuck until a power cycle for\nthis i2c controller.\n\nReading I2DR to obtain the count likewise arms the next byte on the\ncount \u003e I2C_SMBUS_BLOCK_MAX path, which also returned -EPROTO directly\nand left the bus held.\n\nHandle both: NACK the in-flight dummy byte (TXAK) and extend msgs-\u003elen so\nthe existing last-byte handling emits STOP; the dummy byte is discarded.\nA count of 0 is a valid empty block read; a count above\nI2C_SMBUS_BLOCK_MAX is still reported as -EPROTO, but only after the bus\nhas been released.\n\nThe interrupt-driven path has the same flaw from a later commit and is\nfixed separately, as it carries a different Fixes: tag and stable range.",
  "id": "CVE-2026-72142",
  "modified": "2026-08-18T03:31:28.640734106Z",
  "published": "2026-08-15T05:53:15.489Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72142.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72142"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)"
}