Out-of-bounds write in Linux kernel - CVE-2026-89967
Published: September 16, 2026
Vulnerability identifier: #VU150317
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-2026-89967
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause an out-of-bounds write.
The vulnerability exists due to improper bounds checking in migrate_device_range() and migrate_device_pfns() when processing a compound folio that extends beyond a caller-provided PFN array range. A local user can trigger device memory migration with such a compound folio to cause an out-of-bounds write.
Affected software
Linux kernel
How to mitigate CVE-2026-89967
Install security update from vendor's repository.