Out-of-bounds heap read via unchecked CPU index
Published Aug 28, 2026 · Updated Aug 28, 2026
Out-of-bounds heap read in Linux perf tools allows local users to access adjacent memory by processing a crafted perf.data sample. In machine__resolve(), the sample-controlled CPU index reads env->cpu before checking nr_cpus_avail, while values such as 65536 can truncate to CPU 0 during an int16_t cast. Reachability requires perf to process the crafted sample; the published description confirms an invalid heap read but no data disclosure or process crash.
Summary
What happened
Out-of-bounds heap read in Linux perf tools allows local users to access adjacent memory by processing a crafted perf.data sample. In machine__resolve(), the sample-controlled CPU index reads env->cpu before checking nr_cpus_avail, while values such as 65536 can truncate to CPU 0 during an int16_t cast. Reachability requires perf to process the crafted sample; the published description confirms an invalid heap read but no data disclosure or process crash.
The record
- CVE
- CVE-2026-80670
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0c4c4debb0adda4c18c158d95031dc2b9f637869 <5484b43a0ec8231c36fba6ead654cb72dbba8b8f
- Affected versionversion=0c4c4debb0adda4c18c158d95031dc2b9f637869 <b9e8406651dcc1c19238aad11861a758683525b4
- Affected versionversion=0c4c4debb0adda4c18c158d95031dc2b9f637869 <eb266a14c16a93eb4db7b56a452d6be93f8bdcd4
- Affected versionversion=4.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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