Improper input validation in Linux kernel - CVE-2026-72397

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Main Vulnerability Database Vulnerabilities #VU143039

Improper input validation in Linux kernel - CVE-2026-72397

Published: August 15, 2026


Vulnerability identifier: #VU143039
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72397
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to send incorrect voltage commands to a PMBus device.

The vulnerability exists due to improper input validation in pmbus_data2reg_vid() in the pmbus core when converting user-supplied voltage values for PMBUS_VOUT_COMMAND. A local user can request a voltage using a non-VR11 VID mode to send incorrect voltage commands to a PMBus device.

Only drivers that select a non-VR11 VID mode and expose a regulator or hwmon vout setter are affected.


Affected software

Linux kernel
Debian Linux
openEuler
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-nvidia-bos (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-7.0 (Ubuntu package)
linux-nvidia-7.0 (Ubuntu package)
bpftool
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
linux (Debian package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

How to mitigate CVE-2026-72397

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39
linux (Ubuntu package) - update to 7.0.0-38.38
linux-realtime (Ubuntu package) - update to 7.0.0-38.38.1
linux-gcp (Ubuntu package) - update to 7.0.0-1014.14
linux-oracle (Ubuntu package) - update to 7.0.0-1013.13
linux-aws (Ubuntu package) - update to 7.0.0-1014.14
linux-ibm (Ubuntu package) - update to 7.0.0-1015.15
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2022.23
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-38.38~24.04.4
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1013.13~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-gke (Ubuntu package) - update to 7.0.0-1008.9
linux-aws-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia-7.0 (Ubuntu package) - update to 7.0.0-1024.25~24.04.1
bpftool - update to 5.10.0-334.0.0.235
kernel - update to 5.10.0-334.0.0.235
python3-perf-debuginfo - update to 5.10.0-334.0.0.235
python3-perf - update to 5.10.0-334.0.0.235
perf-debuginfo - update to 5.10.0-334.0.0.235
perf - update to 5.10.0-334.0.0.235
kernel-tools-devel - update to 5.10.0-334.0.0.235
kernel-tools-debuginfo - update to 5.10.0-334.0.0.235
kernel-tools - update to 5.10.0-334.0.0.235
kernel-source - update to 5.10.0-334.0.0.235
kernel-headers - update to 5.10.0-334.0.0.235
kernel-devel - update to 5.10.0-334.0.0.235
kernel-debugsource - update to 5.10.0-334.0.0.235
kernel-debuginfo - update to 5.10.0-334.0.0.235
bpftool-debuginfo - update to 5.10.0-334.0.0.235
linux (Debian package) - update to 6.12.115-2
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

External References

Related Security Bulletins