CVE-2026-86848 Red Hat CVE debrief

Who should care

Defenders responsible for systems using DPDK's vhost-crypto, particularly those managing Red Hat products such as Fast Datapath for RHEL 8, 9, and 10, and Red Hat Enterprise Linux 8, 9, and 10, should assess exposure and prioritize verification and potential mitigations.

Why it matters

This vulnerability allows a malicious guest to trigger an out-of-bounds write in the host backend, potentially leading to system compromise. Defenders should prioritize verifying exposure and assessing the need for updates or mitigations.

• Verify exposure in environments using DPDK's vhost-crypto
• Assess potential for malicious guest activity
• Prioritize updates or mitigations for affected systems

Technical summary

The vulnerability is caused by a time-of-check/time-of-use issue in DPDK's vhost-crypto, allowing a malicious guest to trigger an out-of-bounds write in the host backend. This issue affects multiple Red Hat products, including Fast Datapath for RHEL 8, 9, and 10, as well as Red Hat Enterprise Linux 8, 9, and 10. The vulnerability can be triggered by a malicious guest, potentially leading to system compromise. Defenders should prioritize verifying exposure in their environments, especially for systems using DPDK's vhost-crypto, and assess the need for updates or

Defensive priority

Defenders should prioritize verifying exposure in their environments, especially for systems using DPDK's vhost-crypto, and assess the need for updates or mitigations.

Recommended defensive actions

• Verify exposure in environments using DPDK's vhost-crypto
• Assess the need for updates or mitigations
• Monitor for potential malicious activity

Evidence notes

The CVE record and associated source item provide details on the vulnerability. However, specific version information and exploitation details are not provided, requiring further verification.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.