What’s Vulnerable › Vulnerabilities

CVE-2026-80670: perf tools: Use perf_env__get_cpu_topology() in machine__resolve()

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-08-29

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.

Affected products

• Linux kernel: 4.4 — 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/5484b43a0ec8231c36fba6ead654cb72dbba8b8f
• https://git.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4
• https://git.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4

Get alerted when CVE-2026-80670 or the next vulnerability affects your stack