SB20260917163 - Out-of-bounds read in Linux kernel smb server
Published: September 17, 2026
Security Bulletin ID
SB20260917163
CSH Severity
Medium
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-2026-89794)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose uninitialized kernel heap memory.
The vulnerability exists due to an out-of-bounds read in the ksmbd smb2_read_pipe() function when handling compound SMB pipe read responses. A remote attacker can issue an SMB pipe read request that causes alignment padding to be included in a response to disclose uninitialized kernel heap memory.
Remediation
Install update from vendor's website.