SB20260912140 - Integer overflow in Linux kernel smb client
Published: September 12, 2026
Security Bulletin ID
SB20260912140
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Integer overflow (CVE-ID: CVE-2026-89634)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an integer overflow in symlink_data() in fs/smb/client/smb2file.c when processing an SMB error context with a malformed ErrorDataLength value. A remote attacker can provide a crafted SMB error context to cause a denial of service.
Remediation
Install update from vendor's website.