What’s Vulnerable › Vulnerabilities

CVE-2026-72236: s390/perf_cpum_cf: Add missing array_index_nospec() to __hw_perf_event_init()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-23

Description

In the Linux kernel, the following vulnerability has been resolved: s390/perf_cpum_cf: Add missing array_index_nospec() to __hw_perf_event_init() ev variable is userspace controlled via event->attr.config and used as an array index after bounds checking, but without speculation barriers. Add the missing array_index_nospec() call to prevent speculative execution.

Affected products

• Linux kernel: 3.4 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/27206bb57c47bdbe33bccc78fa7f7e2a719a06b9
• https://git.kernel.org/stable/c/49145bce539117db4b6e9e83c0e5ef528e361050
• https://git.kernel.org/stable/c/4c249b214c686f9a1c4cf4f32893b59b189e897a
• https://git.kernel.org/stable/c/a21f3615c88421df81060b6ff89220fd34094c4d
• https://git.kernel.org/stable/c/f79dff8c721bbb1f3fc312ea55e0551c2cc28801
• https://git.kernel.org/stable/c/fa1ebae4206e6afc8caa642e9eb1bbe39a9a724f

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