PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-86849 Red Hat CVE debrief

A flaw was found in DPDK lib/vhost vhost-crypto. Integer overflow in chain length checks, and missing length checks on the RSA path, can overflow a host buffer in the vhost-crypto backend. This vulnerability can lead to a host buffer overflow, allowing attackers to potentially execute arbitrary code or cause a denial of service. Defenders should assess exposure and prioritize patching to prevent potential buffer overflows. The vulnerability is caused by an integer overflow in chain length checks and missing length checks on the RSA path in DPDK lib/vhost vhost-crypto.

Vendor
Red Hat
Product
Fast Datapath for RHEL 10
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-15
Advisory published
2026-10-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for systems using DPDK lib/vhost vhost-crypto should assess exposure and prioritize patching to prevent potential buffer overflows. This includes reviewing system inventory, monitoring for potential exploitation attempts, and verifying and applying patches for affected systems. Defenders should also review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-86849 is a medium-severity vulnerability in DPDK lib/vhost vhost-crypto that can lead to a host buffer overflow. Defenders should prioritize verifying and applying patches, reviewing system inventory, and monitoring for potential exploitation attempts.

  • Verify and apply patches to prevent potential buffer overflows.
  • Review inventory of systems using DPDK lib/vhost vhost-crypto to assess exposure.
  • Monitor for potential buffer overflow attempts to detect possible exploitation.

Technical summary

The vulnerability is caused by an integer overflow in chain length checks and missing length checks on the RSA path in DPDK lib/vhost vhost-crypto, which can lead to a host buffer overflow. This allows attackers to potentially execute arbitrary code or cause a denial of service. The vulnerability is a medium-severity issue in DPDK lib/vhost vhost-crypto that can lead to a host buffer overflow. Defenders should prioritize verifying and applying patches for affected systems, particularly those using vhost-crypto.

Defensive priority

Defenders should prioritize verifying and applying patches for affected systems, particularly those using vhost-crypto.

Recommended defensive actions

  • Verify and apply patches for affected systems, particularly those using vhost-crypto.
  • Review and update inventory of systems using DPDK lib/vhost vhost-crypto.
  • Monitor for potential buffer overflow attempts.

Evidence notes

The CVE record and source item provide details on the vulnerability, but do not specify versions or explicit exploitation. The vulnerability is a medium-severity issue in DPDK lib/vhost vhost-crypto that can lead to a host buffer overflow. The source item and CVE record provide information on the vulnerability, but additional verification is needed to confirm affected systems and assess exposure. Defenders should verify and apply patches, review system inventory, and monitor for buffer

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86849 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86849

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-86849 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86849

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.