CVE-2026-68255
Received Received - Intake

Out-of-Bounds Read in Linux Kernel's Virtio GPU Driver

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/virtio: bound EDID block reads to the response buffer virtio_get_edid_block() validates the read offset only against the device-supplied resp->size field, never against the fixed-size resp->edid array. The EDID block index is driven by the device-supplied extension count, so a malicious virtio-gpu backend can advertise a large size together with a high block count and read far past the array into adjacent kernel memory, which is then surfaced in the parsed EDID (an out-of-bounds read / info leak). Also reject any read whose end exceeds the size of the edid array. Conforming EDID responses stay within the array and are unaffected.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68255
EUVD
EUVD-2026-55356

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is an out-of-bounds read vulnerability in the Linux kernel's virtio GPU driver. A malicious virtio-gpu backend can exploit it by providing a large response size and high block count, causing the kernel to read past the fixed-size EDID array into adjacent memory. This exposes kernel memory contents through the parsed EDID data.

Detection Guidance

This vulnerability is specific to the Linux kernel's virtio GPU driver and requires local system access to exploit. Detection involves checking kernel versions and virtio GPU driver configurations. Use commands like 'uname -a' to check kernel version and 'lsmod | grep virtio_gpu' to verify if the vulnerable driver is loaded.

Impact Analysis

If exploited, this vulnerability could allow an attacker with access to a virtio-gpu backend to leak sensitive kernel memory information. This might include data from other processes or system secrets, potentially leading to further attacks or information disclosure.

Mitigation Strategies

Update the Linux kernel to the latest stable version where this vulnerability is patched. If using a virtio GPU, ensure the backend is trusted and does not advertise malicious EDID block counts. Monitor vendor advisories for kernel updates.

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