Heap corruption via control-queue descriptor double-fetch
Published Oct 14, 2026 · Updated Oct 14, 2026
A heap overflow in DPDK's VDUSE control-queue handler allows guest OS users to corrupt host-process memory via changing descriptors. The virtio_net_ctrl_pop function sizes a buffer from shared descriptor lengths, then reads those lengths again for copying without bounding the total copy to the allocation. Exploitation requires an active VDUSE backend and control queue plus attacker control of shared descriptors during the race; host code execution is not demonstrated.
Summary
What happened
A heap overflow in DPDK's VDUSE control-queue handler allows guest OS users to corrupt host-process memory via changing descriptors. The virtio_net_ctrl_pop function sizes a buffer from shared descriptor lengths, then reads those lengths again for copying without bounding the total copy to the allocation. Exploitation requires an active VDUSE backend and control queue plus attacker control of shared descriptors during the race; host code execution is not demonstrated.
The record
- CVE
- CVE-2026-86562
- Published
- Oct 14, 2026
- Updated
- Oct 14, 2026
- Vendor
- libuser Project
- Product
- Red Hat OpenShift Container Platform 4
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 14, 2026CVE publishedPublication date reported by the CVE source.
- Oct 14, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
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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