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CVE-2026-80670

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: perf tools: Use perf_env__get_cpu_topology() in machine__resolve() machine__resolve() accesses env->cpu[al->cpu].socket_id afte…

Published Aug 28, 2026EPSS 0.67%

Overview

CVE-2026-80670 is a critical-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

perf tools: Use perf_env__get_cpu_topology() in machine__resolve()

machine__resolve() accesses env->cpu[al->cpu].socket_id after checking

al->cpu >= 0 and env->cpu != NULL, but without validating al->cpu

against env->nr_cpus_avail. Since al->cpu comes from the untrusted

perf.data sample, a crafted file with a large CPU index causes an

out-of-bounds heap read.

Use perf_env__get_cpu_topology() which validates both NULL and bounds.

Also bounds-check al->cpu before the cast to struct perf_cpu (int16_t):

without this, values like 65536 silently truncate to 0, bypassing the

accessor's internal check and returning CPU 0's topology.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/5484b43a0ec8231c36fba6ead654cb72dbba8b8fRefgit.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4Refgit.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80670?

CVE-2026-80670 is a critical-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-80670?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-80670?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-80670?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80670 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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