CVE-2026-68255
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.
CSIRTS triage
- What
- The virtio DRM driver does not properly bound EDID block reads to the response buffer, causing out-of-bounds access.
- Who is affected
- Linux systems using virtio GPU devices, particularly in virtualized or cloud environments.
- Urgency
- Medium priority; out-of-bounds reads may leak sensitive kernel memory or cause denial of service.
- Action
- Apply Linux kernel patch for CVE-2026-68255 when available from your distribution.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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