CVE-2026-64524

Kernel disclosure and crash via excessive resolution count

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in the Linux Kernel Hyper-V DRM driver allows attackers controlling the video backend to disclose kernel data or crash guests. The response parser trusts resolution_count in SYNTHVID_RESOLUTION_RESPONSE and indexes past the 64-entry supported_resolution array; a failed probe also leaves display limits unset. Exploitation requires a malicious or compromised Hyper-V host, and the result is kernel-data exposure, a guest oops, or rejection of every userspace framebuffer.

CVSS severity7.7
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 read in the Linux Kernel Hyper-V DRM driver allows attackers controlling the video backend to disclose kernel data or crash guests. The response parser trusts resolution_count in SYNTHVID_RESOLUTION_RESPONSE and indexes past the 64-entry supported_resolution array; a failed probe also leaves display limits unset. Exploitation requires a malicious or compromised Hyper-V host, and the result is kernel-data exposure, a guest oops, or rejection of every userspace framebuffer.

The record

CVE
CVE-2026-64524
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=5.14
  2. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <13d33b9ef67066c77c84273fac5a1d3fde3533d1
  3. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <1fb565b77b8f44afabb02de6310065f109d89e94
  4. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <8a114b25b5521eae451b13bce98ae978624962e5
  5. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <96f7de3172d4aa878b7f87173b2b3507c350fcd6
  6. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <9c698b2c43c2667c34f5336bf46ad5786216ac2a
  7. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <a321c908f2eeea01539668eb270d074d9b88e490
  8. Affected versionversion=76c56a5affeba1e163b66b9d8cc192e6154466f0 <bc573752f3dac0d1ab8df7078c1851bc76717653

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <13d33b9ef67066c77c84273fac5a1d3fde3533d1; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <1fb565b77b8f44afabb02de6310065f109d89e94; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <8a114b25b5521eae451b13bce98ae978624962e5; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <96f7de3172d4aa878b7f87173b2b3507c350fcd6; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <9c698b2c43c2667c34f5336bf46ad5786216ac2a; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <a321c908f2eeea01539668eb270d074d9b88e490; version=76c56a5affeba1e163b66b9d8cc192e6154466f0 <bc573752f3dac0d1ab8df7078c1851bc76717653

Published CVSS scores

7.7LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.2Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/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.

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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

T1499.004Application or System Exploitation

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

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Your stack

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