CVE-2026-89959

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

CVE-2026-89959 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89959, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.8

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0017

6th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 12.15 (bookworm)	6.1.190-1	DEBIAN-CVE-2026-89959	Sep 23, 2026
linux · Debian 13.5 (trixie)	6.12.111-1	DEBIAN-CVE-2026-89959	Sep 23, 2026
linux · Debian 14	7.2.6-1	DEBIAN-CVE-2026-89959	Sep 23, 2026
linux-6.12 · Debian 12.15 (bookworm)	6.12.111-1~deb12u1	DEBIAN-CVE-2026-89959	Sep 23, 2026

Details

Published
September 16, 2026
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89959

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