CVE-2026-72142

CVE CVE-2026-72142EUVD EUVD-2026-58900Published 2026-08-15T05:53:15.000ZLast changed 2026-08-17T05:09:00.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.18.40; 8e8782c71595a5ad29e234ce6b3d2fce787fb07a <60ed00d46616a9232e42ea7a3e3c0273d7cf7543; 8e8782c71595a5ad29e234ce6b3d2fce787fb07a <c882e8cc68fb993700dc21fd6e754001e6297934; patch: 0; patch: 6.6.148; 8e8782c71595a5ad29e234ce6b3d2fce787fb07a <cb2fc37857693b55909fb77dc2c87cfbc1cdc476; patch: 7.1.5; 8e8782c71595a5ad29e234ce6b3d2fce787fb07a <016ef0f6ca4bc9bf0330ac41bd2ea349759643e3; 3.16; 8e8782c71595a5ad29e234ce6b3d2fce787fb07a <6d2c973926d0612360693bc559be2ffde836151b; patch: 7.2; patch: 6.12.101

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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