CVE-2026-68255

Guest kernel-memory disclosure via unbounded EDID reads

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds read in Linux kernel 5.0 and later allows attackers controlling a virtio-gpu backend to expose guest kernel memory via EDID data. The virtio_get_edid_block() path checks offsets only against backend-controlled resp->size, not the fixed resp->edid array, while trusting the EDID extension count. Control of the guest's virtio-gpu backend is required; crafted responses can surface adjacent kernel heap contents in parsed EDID data or crash the guest.

CVSS severity7.7
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux kernel 5.0 and later allows attackers controlling a virtio-gpu backend to expose guest kernel memory via EDID data. The virtio_get_edid_block() path checks offsets only against backend-controlled resp->size, not the fixed resp->edid array, while trusting the EDID extension count. Control of the guest's virtio-gpu backend is required; crafted responses can surface adjacent kernel heap contents in parsed EDID data or crash the guest.

The record

CVE
CVE-2026-68255
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0
  2. Affected versionversion=b4b01b4995fb15b55a2d067eb405917f5ab32709 <2757e6e803092cf0aeaf4b735e16b5d3bdc705c5
  3. Affected versionversion=b4b01b4995fb15b55a2d067eb405917f5ab32709 <35be0e2c6862abcd5e5f5445261f1fd910d4a9b4
  4. Affected versionversion=b4b01b4995fb15b55a2d067eb405917f5ab32709 <375c1934ef0196d3b6d3a1eae3232bef8dae7bf7
  5. Affected versionversion=b4b01b4995fb15b55a2d067eb405917f5ab32709 <4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd
  6. Affected versionversion=b4b01b4995fb15b55a2d067eb405917f5ab32709 <9fc2a017c5d597937e0c28b9a9669844aa796c42

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=b4b01b4995fb15b55a2d067eb405917f5ab32709 <2757e6e803092cf0aeaf4b735e16b5d3bdc705c5; version=b4b01b4995fb15b55a2d067eb405917f5ab32709 <35be0e2c6862abcd5e5f5445261f1fd910d4a9b4; version=b4b01b4995fb15b55a2d067eb405917f5ab32709 <375c1934ef0196d3b6d3a1eae3232bef8dae7bf7; version=b4b01b4995fb15b55a2d067eb405917f5ab32709 <4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd; version=b4b01b4995fb15b55a2d067eb405917f5ab32709 <9fc2a017c5d597937e0c28b9a9669844aa796c42

Published CVSS scores

7.7Linux CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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