What’s Vulnerable › Vulnerabilities

CVE-2026-89959: s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.0 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

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