Out-of-bounds write in Linux kernel - CVE-2026-89907
Published: September 17, 2026
Vulnerability identifier: #VU150383
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89907
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt kernel memory.
The vulnerability exists due to improper input validation in the LoongArch KVM pch_msi_set_irq() function when processing user-supplied MSI data. A local user can supply an MSI data value of 256 or greater through KVM MSI routing or signaling interfaces to corrupt kernel memory.
The DMSINTC path is unaffected.
Affected software
Linux kernel
How to mitigate CVE-2026-89907
Install security update from vendor's repository.