SB2026092579 - Out-of-bounds read in Linux kernel smb client
Published: September 25, 2026
Security Bulletin ID
SB2026092579
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-93787)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause an out-of-bounds read.
The vulnerability exists due to improper bounds checking in cifs_filldir() when processing SMB1 TRANS2 directory enumeration responses. A remote attacker can return a directory entry with an oversized FileNameLength to cause an out-of-bounds read.
User interaction is required to list a directory on a CIFS mount served by an attacker-controlled SMB1 server.
Remediation
Install update from vendor's website.