Out-of-bounds read in Linux kernel - CVE-2026-89532
Published: September 12, 2026
Vulnerability identifier: #VU149266
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-89532
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89532
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3