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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
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)
guessed Create a notification for this product.
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      "current_release_date": "2026-10-16T23:23:03+00:00",
      "cve": "CVE-2026-72142",
      "id": "CVE-2026-72142",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "185",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T01:14:41Z",
      "cve": "CVE-2026-72142",
      "id": "CVE-2026-72142",
      "initial_release_date": "2026-08-31T13:30:18Z",
      "product_status:known_affected": "670",
      "product_status:known_not_affected": "0",
      "product_status:recommended": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72142",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-72142.json",
      "version": "8"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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