SB2026072728 - Out-of-bounds read in Linux kernel drm hyperv driver

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Main Vulnerability Database SB2026072728

SB2026072728 - Out-of-bounds read in Linux kernel drm hyperv driver

Published: July 27, 2026

Security Bulletin ID SB2026072728
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-64527)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in hyperv_receive() and hyperv_receive_sub() in the Hyper-V DRM protocol handler when handling oversized or malformed VMBus packets. A remote attacker can send a specially crafted VMBus packet to cause a denial of service.

An error path may report a required packet length larger than the 16 KiB receive buffer, leading the code to use that length unsafely if forwarded for copying.


Remediation

Install update from vendor's website.

References