Duplicate PMU buffer allocation via initialization race
Published Dec 28, 2024 · Updated Aug 5, 2026
Race condition in Linux 6.12 allows attackers to cause unspecified impact through concurrent s390 PMU event initialization. perf_event_init can invoke allocate_buffers and alloc_sampling_buffer outside the reservation mutex, allocating Sample Data Blocks repeatedly for the same PMU. Exploitation requires an s390 system and parallel perf event creation; the published record does not identify a crash, leak, or other concrete consequence.
Summary
What happened
Race condition in Linux 6.12 allows attackers to cause unspecified impact through concurrent s390 PMU event initialization. perf_event_init can invoke allocate_buffers and alloc_sampling_buffer outside the reservation mutex, allocating Sample Data Blocks repeatedly for the same PMU. Exploitation requires an s390 system and parallel perf event creation; the published record does not identify a crash, leak, or other concrete consequence.
The record
- CVE
- CVE-2024-56706
- Published
- Dec 28, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Dec 28, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=6.12
- Affected versionversion=8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8 <4b3bdfa89635db6a53e02955548bd07bebcae233
- Affected versionversion=8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8 <f55bd479d8663a4a4e403b3d308d3d1aa33d92df
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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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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