CVE-2026-72142 (GCVE-0-2026-72142)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-23 12:46
VLAI
Title
i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < 0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < 38d4947431b2410850409fda016b2ac9f640a4dd (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < e3e8b02d4773cfc5ad561d2e5505efde36c6927a (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < 016ef0f6ca4bc9bf0330ac41bd2ea349759643e3 (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < c882e8cc68fb993700dc21fd6e754001e6297934 (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < 6d2c973926d0612360693bc559be2ffde836151b (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < 60ed00d46616a9232e42ea7a3e3c0273d7cf7543 (git)
Affected: 8e8782c71595a5ad29e234ce6b3d2fce787fb07a , < cb2fc37857693b55909fb77dc2c87cfbc1cdc476 (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:51.665Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-08-15T05:53:15.489Z",
    "dateReserved": "2026-08-09T03:40:39.908Z",
    "dateUpdated": "2026-08-23T12:46:51.665Z",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/i2c/busses/i2c-imx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"38d4947431b2410850409fda016b2ac9f640a4dd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"e3e8b02d4773cfc5ad561d2e5505efde36c6927a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"016ef0f6ca4bc9bf0330ac41bd2ea349759643e3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"c882e8cc68fb993700dc21fd6e754001e6297934\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"6d2c973926d0612360693bc559be2ffde836151b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"60ed00d46616a9232e42ea7a3e3c0273d7cf7543\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8e8782c71595a5ad29e234ce6b3d2fce787fb07a\",\"lessThan\":\"cb2fc37857693b55909fb77dc2c87cfbc1cdc476\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/i2c/busses/i2c-imx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/38d4947431b2410850409fda016b2ac9f640a4dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3e8b02d4773cfc5ad561d2e5505efde36c6927a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T05:25:03+00:00",
      "cve": "CVE-2026-72142",
      "id": "CVE-2026-72142",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72142.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.