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CVE-2026-89959

HIGHCVSS 8.8/10

Last modified

CVE-2026-89959 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.

Description

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.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= eeb386aeb5b7c8d2dae6a3ba49255d8a97803182, < 12871a4269f139221c9fde9ea3eb69c9228f59d4; >= eeb386aeb5b7c8d2dae6a3ba49255d8a97803182, < 02e72909453dee2f8a09f78819f9a9cb902dfbdc; >= eeb386aeb5b7c8d2dae6a3ba49255d8a97803182, < 4bffadde7fc49b00493fb78c6376f958998d4b8c; >= eeb386aeb5b7c8d2dae6a3ba49255d8a97803182, < f7d66afc34bc6e833c8ebe56973afec35f473bc1; >= eeb386aeb5b7c8d2dae6a3ba49255d8a97803182, < 2ff68bf414de167bc138e6e211ee1ad3ab3c5052; >= eeb386aeb5b7c8d2dae6a3ba49255d8a97803182, < 6b8a02e216f6b520cc029e43ddc83956605135d5
LinuxLinux6.0

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89959?
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.
How severe is CVE-2026-89959?
CVE-2026-89959 has a CVSS score of 8.8/10 (HIGH severity).
How do I fix CVE-2026-89959?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST