SB20260912244 - Out-of-bounds read in Linux kernel linux sunrpc
Published: September 12, 2026
Security Bulletin ID
SB20260912244
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-89532)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 underflow resulting in an out-of-bounds read in the pcl_for_each_segment macro when processing a Write or Reply chunk with zero segments. A remote attacker can send a crafted Write or Reply chunk advertising zero segments to cause a denial of service.
The transport must have negotiated Send-With-Invalidate.
Remediation
Install update from vendor's website.