{
  "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",
          "versions": [
            {
              "lessThan": "5d3240f42a667e29262aff76fdebfcdac4980626",
              "status": "affected",
              "version": "5f5c2d4579ca6836f5604cca979debd68ecfe23f",
              "versionType": "git"
            },
            {
              "lessThan": "56ddfc18ea8f7d77747658892873eb632b2ed530",
              "status": "affected",
              "version": "5f5c2d4579ca6836f5604cca979debd68ecfe23f",
              "versionType": "git"
            },
            {
              "lessThan": "07fd9385f0d87dff4b34f355f68adf701080cb24",
              "status": "affected",
              "version": "5f5c2d4579ca6836f5604cca979debd68ecfe23f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/busses/i2c-imx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "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 (IRQ)\n\nSMBus 3.1 6.5.7 allows a Block Read byte count of 0, but the\ninterrupt-driven block-read state machine rejects it as -EPROTO. Worse,\nit returns without a NACK+STOP: the next receive cycle has already\nstarted, so the target keeps holding SDA and the bus stays stuck until a\npower cycle of this i2c controller.\n\nAccept count=0: NACK the in-flight dummy byte (TXAK) and set msg-\u003elen to\n2 so i2c_imx_isr_read_continue() emits STOP via its normal last-byte\npath. The dummy byte is discarded; block-read callers only consume\nbuf[0..count-1].\n\nReading I2DR has likewise already armed the next byte on the\ncount \u003e I2C_SMBUS_BLOCK_MAX error path, so NACK it (TXAK) before aborting\nwith -EPROTO; otherwise the failing transfer\u0027s STOP cannot complete and\nthe bus stays held.\n\nThe atomic path regressed earlier (v3.16) and is fixed separately; this\npatch covers only the v6.13 state-machine rework."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - On NXP Layerscape/i.MX appliances, remotely reachable IPMI-over-LAN or management-plane requests invoke ipmi_ssif/pmbus i2c_smbus_read_block_data() on imx-i2c; a malicious or compromised bus peripheral returning SMBus block-read count 0 reaches the vulnerable IRQ handler without local login.\nAC:L - Once an SMBus block-read transaction is initiated and the target returns count byte 0 (a valid SMBus 3.1 response), the IRQ path deterministically omits NACK/STOP and locks the bus; the attacker controls both transaction initiation and slave response via compromised BMC/PMBus device or planted peripheral.\nPR:N - No Linux credentials are required when a malicious or compromised I2C slave returns count 0 during kernel-initiated SMBus block reads from IPMI SSIF, PMBus hwmon polling, or other automated drivers; OS privilege is not needed beyond influencing the bus response.\nUI:N - Exploitation requires no victim interaction because kernel subsystems (IPMI SSIF, PMBus hwmon, sensor drivers) automatically perform SMBus block reads during normal remote-management or background monitoring operations once the bus device responds.\nS:U - Impact is confined to locking the imx-i2c controller and attached I2C bus within the same kernel/host security boundary; it does not cross VM, container, or IOMMU isolation boundaries.\nC:N - The flaw is a missing NACK/STOP during SMBus block-read length handling; it causes a stuck I2C bus but does not corrupt kernel memory, leak data, or provide read primitives.\nI:N - No kernel or user data is modified; the bug only leaves the I2C controller in a hung bus state without write primitives, code execution, or integrity violations beyond loss of bus function.\nA:H - A successful trigger permanently locks the imx-i2c bus until controller power-cycle, denying all further I2C/SMBus communication to PMICs, sensors, EEPROMs, and BMC SSIF on safety-critical embedded, automotive, and datacenter systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:40:49.962Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5d3240f42a667e29262aff76fdebfcdac4980626"
        },
        {
          "url": "https://git.kernel.org/stable/c/56ddfc18ea8f7d77747658892873eb632b2ed530"
        },
        {
          "url": "https://git.kernel.org/stable/c/07fd9385f0d87dff4b34f355f68adf701080cb24"
        }
      ],
      "title": "i2c: imx: fix locked bus on SMBus block-read of 0 (IRQ)",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72141",
    "datePublished": "2026-08-15T05:53:14.754Z",
    "dateReserved": "2026-08-09T03:40:39.908Z",
    "dateUpdated": "2026-08-17T05:40:49.962Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}