{"id":"CVE-2026-72142","title":"i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)","summary":"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. Wo…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 38d4947431b2410850409fda016b2ac9f640a4dd","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < e3e8b02d4773cfc5ad561d2e5505efde36c6927a","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 016ef0f6ca4bc9bf0330ac41bd2ea349759643e3","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < c882e8cc68fb993700dc21fd6e754001e6297934","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 6d2c973926d0612360693bc559be2ffde836151b","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 60ed00d46616a9232e42ea7a3e3c0273d7cf7543","Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < cb2fc37857693b55909fb77dc2c87cfbc1cdc476","Linux 3.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:51:58.347338Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:55:20.925Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72142","references":[{"url":"https://git.kernel.org/stable/c/0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec"},{"url":"https://git.kernel.org/stable/c/38d4947431b2410850409fda016b2ac9f640a4dd"},{"url":"https://git.kernel.org/stable/c/e3e8b02d4773cfc5ad561d2e5505efde36c6927a"},{"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"}],"tags":["cve.org"],"epss":0.00216,"epssPercentile":0.12153,"ingestedAt":"2026-11-06T18:00:12.592Z","slug":"CVE-2026-72142","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 38d4947431b2410850409fda016b2ac9f640a4dd`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < e3e8b02d4773cfc5ad561d2e5505efde36c6927a`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 016ef0f6ca4bc9bf0330ac41bd2ea349759643e3`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < c882e8cc68fb993700dc21fd6e754001e6297934`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 6d2c973926d0612360693bc559be2ffde836151b`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < 60ed00d46616a9232e42ea7a3e3c0273d7cf7543`\n- `Linux >= 8e8782c71595a5ad29e234ce6b3d2fce787fb07a < cb2fc37857693b55909fb77dc2c87cfbc1cdc476`\n- `Linux 3.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}