CVE-2026-46209

Out-of-bounds memory access via rounded-down plane dimensions

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds access in Linux Kernel allows local users to read or write beyond a GEM object through a crafted DRM framebuffer. drm_gem_fb_init_with_funcs() rounds subsampled plane dimensions down, allowing a zero height to underflow and a too-small GEM object to pass validation. Exploitation requires local DRM framebuffer access and a vulnerable pixel-format and dimension combination; the resulting GPU access crosses the object's bounds.

CVSS severity7.8
High
EPSS probability0.14%
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 access in Linux Kernel allows local users to read or write beyond a GEM object through a crafted DRM framebuffer. drm_gem_fb_init_with_funcs() rounds subsampled plane dimensions down, allowing a zero height to underflow and a too-small GEM object to pass validation. Exploitation requires local DRM framebuffer access and a vulnerable pixel-format and dimension combination; the resulting GPU access crosses the object's bounds.

The record

CVE
CVE-2026-46209
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.14
  2. Affected versionversion=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <1a17ea9861e89585361caa8bc231bd22dc6dbe7d
  3. Affected versionversion=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <1da4ab7189f1064b3b712b388772c008b4d82580
  4. Affected versionversion=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <3d4c2268bd7243c3780fe32bf24ff876da272acf
  5. Affected versionversion=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <6b992591e04f2cce813bcf239b354f375bbf84d3
  6. Affected versionversion=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <c5fc49d8470c5ebf3b41607600f277158f159950

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.14; version=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <1a17ea9861e89585361caa8bc231bd22dc6dbe7d; version=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <1da4ab7189f1064b3b712b388772c008b4d82580; version=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <3d4c2268bd7243c3780fe32bf24ff876da272acf; version=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <6b992591e04f2cce813bcf239b354f375bbf84d3; version=4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 <c5fc49d8470c5ebf3b41607600f277158f159950

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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