SB20260727280 - Out-of-bounds write in Linux kernel exfat

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260727280

SB20260727280 - Out-of-bounds write in Linux kernel exfat

Published: July 27, 2026

Security Bulletin ID SB20260727280
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

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-2026-64296)

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

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause an out-of-bounds read and write.

The vulnerability exists due to an out-of-bounds write in exfat_find_dir_entry() when parsing crafted exfat directory entries containing many short name fragments. A local user can provide a crafted directory structure to cause an out-of-bounds read and write.

The issue occurs because the per-entry output pointer advances by a fixed amount while the tracked accumulated name length can remain smaller when a name fragment contains an early NUL.


Remediation

Install update from vendor's website.

References