Incorrect calculation in Linux kernel - CVE-2026-89959
Published: September 17, 2026
Vulnerability identifier: #VU150325
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-2026-89959
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise the confidentiality, integrity, and availability of a KVM guest.
The vulnerability exists due to an incorrect bitmap operation in vfio_ap_mdev_cfg_remove when removing control domains from a mediated device. A local user can trigger control-domain removal to compromise the confidentiality, integrity, and availability of a KVM guest.
Affected software
Linux kernel
How to mitigate CVE-2026-89959
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/02e72909453dee2f8a09f78819f9a9cb902dfbdc
- https://git.kernel.org/stable/c/12871a4269f139221c9fde9ea3eb69c9228f59d4
- https://git.kernel.org/stable/c/2ff68bf414de167bc138e6e211ee1ad3ab3c5052
- https://git.kernel.org/stable/c/4bffadde7fc49b00493fb78c6376f958998d4b8c
- https://git.kernel.org/stable/c/6b8a02e216f6b520cc029e43ddc83956605135d5
- https://git.kernel.org/stable/c/f7d66afc34bc6e833c8ebe56973afec35f473bc1