s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove (CVE-2026-89959) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89959

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

Answer in brief

CVE-2026-89959 records a Unknown severity vulnerability in s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 <12871a4269f139221c9fde9ea3eb69c9228f59d4 \|\| >=eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 <02e72909453dee2f8a09f78819f9a9cb902dfbdc \|\| >=eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 <4bffadde7fc49b00493fb78c6376f958998d4b8c \|\| >=eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 <f7d66afc34bc6e833c8ebe56973afec35f473bc1 \|\| >=eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 <2ff68bf414de167bc138e6e211ee1ad3ab3c5052 \|\| >=eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 <6b8a02e216f6b520cc029e43ddc83956605135d5	12871a4269f139221c9fde9ea3eb69c9228f59d4, 02e72909453dee2f8a09f78819f9a9cb902dfbdc, 4bffadde7fc49b00493fb78c6376f958998d4b8c, f7d66afc34bc6e833c8ebe56973afec35f473bc1, 2ff68bf414de167bc138e6e211ee1ad3ab3c5052, 6b8a02e216f6b520cc029e43ddc83956605135d5
Linux/Linuxgeneric	6.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 12871a4269f139221c9fde9ea3eb69c9228f59d4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.