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CVE-2026-89959

HIGHCVSS 8.8/10EPSS 0.17%

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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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

EPSS Probability
0.17%

5.8th percentile

Probability of exploitation in the next 30 days. Learn more

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). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
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