{"apiVersion":"1.0","identifier":"CVE-2026-72142","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.","publishedAt":"2026-08-15T06:21:31","lastModifiedAt":"2026-08-23T13:16:40","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72142","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00211,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72142","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72142","en":"https://www.redsauce.net/en/cves/CVE-2026-72142","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72142","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72142","de":"https://www.redsauce.net/de/cves/CVE-2026-72142","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72142","el":"https://www.redsauce.net/el/cves/CVE-2026-72142"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72142"}}