i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)
Summary
| CVE | CVE-2026-72142 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 06:21:31 UTC |
| Updated | 2026-08-23 13:16:40 UTC |
| 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. |
Risk And Classification
EPSS: 0.002110000 probability, percentile 0.111470000 (date 2026-08-24)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 38d4947431b2410850409fda016b2ac9f640a4dd git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a e3e8b02d4773cfc5ad561d2e5505efde36c6927a git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 016ef0f6ca4bc9bf0330ac41bd2ea349759643e3 git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a c882e8cc68fb993700dc21fd6e754001e6297934 git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 6d2c973926d0612360693bc559be2ffde836151b git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a 60ed00d46616a9232e42ea7a3e3c0273d7cf7543 git | Not specified |
| CNA | Linux | Linux | affected 8e8782c71595a5ad29e234ce6b3d2fce787fb07a cb2fc37857693b55909fb77dc2c87cfbc1cdc476 git | Not specified |
| CNA | Linux | Linux | affected 3.16 | Not specified |
| CNA | Linux | Linux | unaffected 3.16 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.266 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.217 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.184 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e3e8b02d4773cfc5ad561d2e5505efde36c6927a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/38d4947431b2410850409fda016b2ac9f640a4dd | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.