CVE-2026-72141

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72141", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.908Z", "datePublished": "2026-08-15T05:53:14.754Z", "dateUpdated": "2026-08-17T05:40:49.962Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:40:49.962Z"}, "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->len 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 > I2C_SMBUS_BLOCK_MAX error path, so NACK it (TXAK) before aborting\nwith -EPROTO; otherwise the failing transfer's 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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/i2c/busses/i2c-imx.c"], "versions": [{"version": "5f5c2d4579ca6836f5604cca979debd68ecfe23f", "lessThan": "5d3240f42a667e29262aff76fdebfcdac4980626", "status": "affected", "versionType": "git"}, {"version": "5f5c2d4579ca6836f5604cca979debd68ecfe23f", "lessThan": "56ddfc18ea8f7d77747658892873eb632b2ed530", "status": "affected", "versionType": "git"}, {"version": "5f5c2d4579ca6836f5604cca979debd68ecfe23f", "lessThan": "07fd9385f0d87dff4b34f355f68adf701080cb24", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/i2c/busses/i2c-imx.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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->len 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 > I2C_SMBUS_BLOCK_MAX error path, so NACK it (TXAK) before aborting\nwith -EPROTO; otherwise the failing transfer's 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."}], "id": "CVE-2026-72141", "lastModified": "2026-08-17T06:18:14.070", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:21:31.717", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/07fd9385f0d87dff4b34f355f68adf701080cb24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/56ddfc18ea8f7d77747658892873eb632b2ed530"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d3240f42a667e29262aff76fdebfcdac4980626"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: i2c: imx: fix locked bus on SMBus block-read of 0 (IRQ)", "id": "2516716", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516716"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-413", "details": ["A flaw was found in the Linux kernel's i2c-imx driver. A malicious device on the I2C bus or a local attacker with access to the I2C bus could exploit this vulnerability by initiating an SMBus block-read operation with a zero byte count. This can cause the I2C bus to become locked, requiring a power cycle of the controller to restore functionality, leading to a Denial of Service (DoS)."], "name": "CVE-2026-72141", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72141\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72141\nhttps://lore.kernel.org/linux-cve-announce/2026081532-CVE-2026-72141-2eec@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5f5c2d4579ca6836f5604cca979debd68ecfe23f,5d3240f42a667e29262aff76fdebfcdac4980626)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5f5c2d4579ca6836f5604cca979debd68ecfe23f,56ddfc18ea8f7d77747658892873eb632b2ed530)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5f5c2d4579ca6836f5604cca979debd68ecfe23f,07fd9385f0d87dff4b34f355f68adf701080cb24)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.13,6.13]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T08:45:05.630345+00:00", "updated": "2026-08-22T11:45:03.561382+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}