SB20260816531 - Out-of-bounds write in Linux kernel memstick core driver

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Main Vulnerability Database SB20260816531

SB20260816531 - Out-of-bounds write in Linux kernel memstick core driver

Published: August 16, 2026

Security Bulletin ID SB20260816531
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Physical access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-68478)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows an attacker with physical access to corrupt memory.

The vulnerability exists due to an out-of-bounds write in the ms_block Memory Stick block translation layer when processing a Memory Stick card that reports an excessive number of blocks. An attacker with physical access can provide a crafted card with a block count above the supported maximum to corrupt memory.

The issue occurs because the card-supplied block count can cause indexing past the end of the fixed free_block_count array.


Remediation

Install update from vendor's website.

References