Bug 2535220 (CVE-2026-89959) - CVE-2026-89959 kernel: s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove
Summary: CVE-2026-89959 kernel: s390/vfio-ap: Fix control domain removal in vfio_ap_md...
Keywords:
Status: NEW
Alias: CVE-2026-89959
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-16 11:37 UTC by OSIDB Bzimport
Modified: 2026-10-23 17:36 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-16 11:37:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove

The vfio_ap_config_remove function uses the bitmap_andnot function to clear
bits from the matrix_mdev->matrix.adm bitmap (specifies the control domains
assigned to the mdev). This prevents the explicitly unplugged control
domains from being removed the KVM guest. The bitmap_and function is used
instead.
Comment 1 Keith Grant 2026-09-16 18:34:25 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89959.mbox
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