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CVE-2026-48914 Red Hat CVE debrief

CVE-2026-48914 is a medium-severity vulnerability in QEMU's virtio-blk device. The device fails to properly validate the size of input descriptors before writing data, allowing a malicious guest with high privileges to submit a malformed virtio-blk SCSI request. This can lead to an out-of-bounds write in the host heap memory and potentially cause a denial of service (DoS) for the QEMU process.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
MEDIUM 6.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-08-31
Advisory published
2026-06-12
Advisory updated
2026-08-31

Who should care

Users of QEMU, particularly those with high-privilege guest access, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by the virtio-blk device's lack of proper input descriptor size validation. A malicious guest can exploit this by submitting a malformed virtio-blk SCSI request, potentially leading to an out-of-bounds write in the host heap memory.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update QEMU to a version that includes a fix for this vulnerability.
  • Restrict access to high-privilege guest accounts.
  • Monitor QEMU process stability and host heap memory usage.

Evidence notes

The CVE record and NVD detail pages provide information on this vulnerability. [resourceLinkAnnotations:cve-org,nvd]

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48914 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48914

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

  • CVE-2026-48914 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48914

    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.