CVE-2026-72142: i2c: imx: fix locked bus on SMBus block-read of 0 (atomic)

Received
AliasesUBUNTU-CVE-2026-72142DEBIAN-CVE-2026-72142
Published 15-08-2026Last modified 23-08-2026

Vulnerability summary

CVE-2026-72142 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.1% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 12
SUSE-SU-2026:4282-1SUSE-SU-2026:5091-1USN-8887-1USN-8887-2USN-8887-3USN-8888-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 23-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.22% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-202.212 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1119.126 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.5-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < 0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < 38d4947431b2410850409fda016b2ac9f640a4dd | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < e3e8b02d4773cfc5ad561d2e5505efde36c6927a | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < 016ef0f6ca4bc9bf0330ac41bd2ea349759643e3 | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < c882e8cc68fb993700dc21fd6e754001e6297934 | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < 6d2c973926d0612360693bc559be2ffde836151b | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < 60ed00d46616a9232e42ea7a3e3c0273d7cf7543 | ≥ 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, < cb2fc37857693b55909fb77dc2c87cfbc1cdc476 | 3.16

3 vendors · 172 products

References

22 links
Show all 22 references