SB2026082759 - Out-of-bounds read in Linux kernel fbdev core driver

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Main Vulnerability Database SB2026082759

SB2026082759 - Out-of-bounds read in Linux kernel fbdev core driver

Published: August 27, 2026

Security Bulletin ID SB2026082759
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-80578)

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

CVSSv4: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information and cause a denial of service.

The vulnerability exists due to out-of-bounds read in fb_io_read() when processing a read operation after a partial copy_to_user() result. A local user can provide a faulty user buffer to trigger pointer desynchronization and disclose sensitive information and cause a denial of service.

The issue occurs because the source pointer can become over-advanced relative to the remaining byte count after a partial copy.


Remediation

Install update from vendor's website.

References