Kernel out-of-bounds read via mixed perf groups
Published May 1, 2026 · Updated May 1, 2026
Out-of-bounds read in Linux Kernel 6.16 through 6.18.21 and 6.19 through 6.19.11 allows local users to trigger invalid kernel memory access. An auto-counter-reload group can contain a software event whose PMU is not x86_hybrid_pmu, yet intel_pmu_set_acr_caused_constr applies container_of through the hybrid helper without first verifying is_x86_event. Local low-privileged access is required; the record does not establish whether the out-of-bounds read is exposed to user space or instead causes a kernel fault.
Summary
What happened
Out-of-bounds read in Linux Kernel 6.16 through 6.18.21 and 6.19 through 6.19.11 allows local users to trigger invalid kernel memory access. An auto-counter-reload group can contain a software event whose PMU is not x86_hybrid_pmu, yet intel_pmu_set_acr_caused_constr applies container_of through the hybrid helper without first verifying is_x86_event. Local low-privileged access is required; the record does not establish whether the out-of-bounds read is exposed to user space or instead causes a kernel fault.
The record
- CVE
- CVE-2026-31782
- Published
- May 1, 2026
- Updated
- May 1, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 1, 2026CVE publishedPublication date reported by the CVE source.
- May 1, 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=6.16
- Affected versionversion=ec980e4facef8110f6fce27e5b6344660117f01f <bfee04838f636d064bc92075c65c95f739003804
- Affected versionversion=ec980e4facef8110f6fce27e5b6344660117f01f <dbde07f06226438cd2cf1179745fa1bec5d8914a
- Affected versionversion=ec980e4facef8110f6fce27e5b6344660117f01f <e435a30ca6fe14c9611b1fc731c98a6d28410247
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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