Observable discrepancy in Linux kernel - CVE-2026-72236

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Main Vulnerability Database Vulnerabilities #VU143359

Observable discrepancy in Linux kernel - CVE-2026-72236

Published: August 16, 2026


Vulnerability identifier: #VU143359
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72236
CWE-ID: CWE-203
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to improper restriction of speculative execution in __hw_perf_event_init() in arch/s390/kernel/perf_cpum_cf.c when processing a user-controlled perf event configuration value as an array index. A local user can supply a crafted event->attr.config value to disclose sensitive information.


Affected software

Linux kernel
Ubuntu
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-72236

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
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

External References

Related Security Bulletins