CVE-2026-72142 (GCVE-0-2026-72142)
Vulnerability from cvelistv5
Published
2026-08-15 05:53
Modified
2026-08-23 12:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: imx: fix locked bus on SMBus block-read of 0 (atomic) SMBus 3.1 6.5.7 allows a Block Read byte count of 0, but the atomic (polling) path rejects it as -EPROTO. Worse, it returns without a NACK+STOP: the next receive cycle has already started, so the target keeps holding SDA and the bus stays stuck until a power cycle for this i2c controller. Reading I2DR to obtain the count likewise arms the next byte on the count > I2C_SMBUS_BLOCK_MAX path, which also returned -EPROTO directly and left the bus held. Handle both: NACK the in-flight dummy byte (TXAK) and extend msgs->len so the existing last-byte handling emits STOP; the dummy byte is discarded. A count of 0 is a valid empty block read; a count above I2C_SMBUS_BLOCK_MAX is still reported as -EPROTO, but only after the bus has been released. The interrupt-driven path has the same flaw from a later commit and is fixed separately, as it carries a different Fixes: tag and stable range.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
Version: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/busses/i2c-imx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "3.16"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
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              "version": "6.18.40",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:51.665Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/38d4947431b2410850409fda016b2ac9f640a4dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3e8b02d4773cfc5ad561d2e5505efde36c6927a"
        },
        {
          "url": "https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b"
        },
        {
          "url": "https://git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476"
        }
      ],
      "title": "i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72142",
    "datePublished": "2026-08-15T05:53:15.489Z",
    "dateReserved": "2026-08-09T03:40:39.908Z",
    "dateUpdated": "2026-08-23T12:46:51.665Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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