CVE-2026-72142 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3
https://git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543
https://git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b
https://git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934
https://git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476

Type	Values Removed	Values Added
Description		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.
Title		i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3 https://git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543 https://git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b https://git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934 https://git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72142", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.908Z", "datePublished": "2026-08-15T05:53:15.489Z", "dateUpdated": "2026-08-15T05:53:15.489Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T05:53:15.489Z"}, "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 > 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->len 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": [{"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": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "lessThan": "016ef0f6ca4bc9bf0330ac41bd2ea349759643e3", "status": "affected", "versionType": "git"}, {"version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "lessThan": "c882e8cc68fb993700dc21fd6e754001e6297934", "status": "affected", "versionType": "git"}, {"version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "lessThan": "6d2c973926d0612360693bc559be2ffde836151b", "status": "affected", "versionType": "git"}, {"version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "lessThan": "60ed00d46616a9232e42ea7a3e3c0273d7cf7543", "status": "affected", "versionType": "git"}, {"version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "lessThan": "cb2fc37857693b55909fb77dc2c87cfbc1cdc476", "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": "3.16", "status": "affected"}, {"version": "0", "lessThan": "3.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "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-rc4", "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": "3.16", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "7.2-rc4"}]}]}], "references": [{"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"}}}}

{"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": "016ef0f6ca4bc9bf0330ac41bd2ea349759643e3", "status": "affected", "version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "versionType": "git"}, {"lessThan": "c882e8cc68fb993700dc21fd6e754001e6297934", "status": "affected", "version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "versionType": "git"}, {"lessThan": "6d2c973926d0612360693bc559be2ffde836151b", "status": "affected", "version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "versionType": "git"}, {"lessThan": "60ed00d46616a9232e42ea7a3e3c0273d7cf7543", "status": "affected", "version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "versionType": "git"}, {"lessThan": "cb2fc37857693b55909fb77dc2c87cfbc1cdc476", "status": "affected", "version": "8e8782c71595a5ad29e234ce6b3d2fce787fb07a", "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": "3.16"}, {"lessThan": "3.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "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-rc4", "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 (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 > 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->len 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."}], "id": "CVE-2026-72142", "lastModified": "2026-08-15T06:21:31.827", "metrics": {}, "published": "2026-08-15T06:21:31.827", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3"}, {"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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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