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Advisory severityHigh7.0Red Hat Linux

High [CVE-2026-64191] Reject I2C block transfers with invalid length

This high-severity Red Hat Linux advisory covers CVE-2026-64191 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-64191 Source published Source updated

VulniPulse record published Record updated

CVE-2026-64191
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

In the Linux kernel, the following vulnerability has been resolved: i2c: stub: Reject I2C block transfers with invalid length The I2C_SMBUS_I2C_BLOCK_DATA case in stub_xfer() uses data->block[0] as the transfer length.

The existing check only clamps it to avoid overrunning the chip->words[256] register array, but does not validate it against I2C_SMBUS_BLOCK_MAX (32), which is the limit of the union i2c_smbus_data.block buffer (34 bytes total). The driver is a development/test tool (CONFIG_I2C_STUB=m, not built by default) that must be loaded with a chip_addr= parameter.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 9 more.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.65.1.el10_2
  • kernel-0:6.12.0-55.108.1.el10_0
  • kernel-rt-0:3.10.0-1160.162.1.rt56.1314.el7
  • kernel-0:3.10.0-1160.162.1.el7
  • kernel-rt-0:4.18.0-553.158.1.rt7.499.el8_10
  • kernel-0:4.18.0-553.158.1.el8_10
  • kernel-0:4.18.0-305.206.1.el8_4
  • kernel-0:4.18.0-372.213.1.el8_6
  • kernel-0:4.18.0-477.166.1.el8_8
  • kernel-0:5.14.0-687.42.1.el9_8
  • kernel-0:5.14.0-284.195.1.el9_2
  • kernel-rt-0:5.14.0-284.195.1.rt14.480.el9_2
  • kernel-0:5.14.0-427.153.1.el9_4
  • kernel-0:5.14.0-570.140.1.el9_6
  • RHSA-2026:81406
  • RHSA-2026:75560
  • RHSA-2026:70308
  • RHSA-2026:70290
  • RHSA-2026:59737
  • RHSA-2026:59821
  • RHSA-2026:65710
  • RHSA-2026:65711
  • RHSA-2026:65709
  • RHSA-2026:59723
  • RHSA-2026:77215
  • RHSA-2026:77214
  • RHSA-2026:73645
  • RHSA-2026:65708

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.65.1.el10_2, kernel-0:6.12.0-55.108.1.el10_0, kernel-rt-0:3.10.0-1160.162.1.rt56.1314.el7, kernel-0:3.10.0-1160.162.1.el7, kernel-rt-0:4.18.0-553.158.1.rt7.499.el8_10, kernel-0:4.18.0-553.158.1.el8_10. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

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