SB20260727236 - Out-of-bounds write in Linux kernel usb serial driver

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Main Vulnerability Database SB20260727236

SB20260727236 - Out-of-bounds write in Linux kernel usb serial driver

Published: July 27, 2026

Security Bulletin ID SB20260727236
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-64333)

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

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to memory corruption in digi_write_inb_command() in the digi_acceleport usb serial driver when handling usb serial write commands while the write urb is in use. A local user can trigger a timeout or no-timeout command path to corrupt the write urb buffer to cause memory corruption.

On 32-bit systems, one corruption path is triggered by a broken jiffies comparison after several minutes of system uptime, while commands such as break control can corrupt the urb immediately when no timeout is used.


Remediation

Install update from vendor's website.

References