{"api_version":"1","generated_at":"2026-08-25T21:07:43+00:00","cve":"CVE-2026-72142","urls":{"html":"https://cve.report/CVE-2026-72142","api":"https://cve.report/api/cve/CVE-2026-72142.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72142","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72142"},"summary":{"title":"i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:31","updated_at":"2026-08-23 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72142","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 38d4947431b2410850409fda016b2ac9f640a4dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a e3e8b02d4773cfc5ad561d2e5505efde36c6927a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 016ef0f6ca4bc9bf0330ac41bd2ea349759643e3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72142","cve":"CVE-2026-72142","epss":"0.002110000","percentile":"0.111470000","score_date":"2026-08-24","updated_at":"2026-08-25 00:11:32"},"legacy_qids":[]},"source_records":{"cve_program":{"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":"0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec","status":"affected","version":"8e8782c71595a5ad29e234ce6b3d2fce787fb07a","versionType":"git"},{"lessThan":"38d4947431b2410850409fda016b2ac9f640a4dd","status":"affected","version":"8e8782c71595a5ad29e234ce6b3d2fce787fb07a","versionType":"git"},{"lessThan":"e3e8b02d4773cfc5ad561d2e5505efde36c6927a","status":"affected","version":"8e8782c71595a5ad29e234ce6b3d2fce787fb07a","versionType":"git"},{"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":"5.10.*","status":"unaffected","version":"5.10.266","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.217","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.184","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","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.266","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.217","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.184","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"3.16","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 (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."}],"providerMetadata":{"dateUpdated":"2026-08-23T12:46:51.665Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72142","datePublished":"2026-08-15T05:53:15.489Z","dateReserved":"2026-08-09T03:40:39.908Z","dateUpdated":"2026-08-23T12:46:51.665Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:31","lastModifiedDate":"2026-08-23 13:16:40","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72142","Ordinal":"1","Title":"i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)","CVE":"CVE-2026-72142","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72142","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)"}]}}}