CVE-2026-89958 s390/vfio-ap: Fix dereference matrix_mdev->kvm without checking for NULL

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix dereference matrixmdev-kvm without checking for NULL The apdriver structure has two fields which are function pointers to callbacks: .onconfigchanged: called at the start of the AP bus scan function to notify th...

CVE-2026-89957 s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed The vfioapmdevhotunplugcfg function uses the return value of bitmapandnot to determine whether the guest APCB needs to be updated. However, bitmapandnot...

CVE-2026-89957 s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed The vfioapmdevhotunplugcfg function uses the return value of bitmapandnot to determine whether the guest APCB needs to be updated. However, bitmapandnot...

EUVD-2026-80557

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed The vfioapmdevhotunplugcfg function uses the return value of bitmapandnot to determine whether the guest APCB needs to be updated. However, bitmapandnot...

CVE-2026-89957

CVE-2026-89957 affects the Linux kernel s390 vfio-ap driver. In vfio_ap_mdev_hot_unplug_cfg(), the return value of bitmap_andnot() is used to decide whether the guest APCB needs updating. When the last AP adapter or domain assigned to an mdev is removed, the resulting empty bitmap causes bitmap_a...

CVE-2026-89956 s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix missing lock required to access list of apmatrixmdev objects In order to traverse or add/remove apmatrixmdev objects in the matrixdev-mdevlist, the matrixdev-guestslock mutex must be held. There are two function...

CVE-2026-89955

A NULL pointer dereference vulnerability exists in the Linux kernel's s390/vfio-ap module. The race occurs when vfio_ap_mdev_probe_queue() creates the sysfs attribute group before the queue's driver data is set; a concurrent read of the status attribute then retrieves NULL via dev_get_drvdata() a...

EUVD-2026-80555

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix NULL deref in statusshow during queue probe When vfioapmdevprobequeue creates the sysfs attribute group, the queue's driver data has not yet been set. A concurrent read of the 'status' attribute can therefore ca...

CVE-2026-89955 s390/vfio-ap: Fix NULL deref in status_show() during queue probe

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix NULL deref in statusshow during queue probe When vfioapmdevprobequeue creates the sysfs attribute group, the queue's driver data has not yet been set. A concurrent read of the 'status' attribute can therefore ca...

CVE-2026-89956

CVE-2026-89956 affects the s390/vfio-ap subsystem of the Linux kernel. The root cause is a missing matrix_dev->guests_lock mutex when traversing or modifying the mdev_list of ap_matrix_mdev objects. Two functions are affected: vfio_ap_mdev_probe , which added objects to the list using the wron...

EUVD-2026-80556

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix missing lock required to access list of apmatrixmdev objects In order to traverse or add/remove apmatrixmdev objects in the matrixdev-mdevlist, the matrixdev-guestslock mutex must be held. There are two function...

CVE-2026-89955 s390/vfio-ap: Fix NULL deref in status_show() during queue probe

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix NULL deref in statusshow during queue probe When vfioapmdevprobequeue creates the sysfs attribute group, the queue's driver data has not yet been set. A concurrent read of the 'status' attribute can therefore ca...

CVE-2026-89956 s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix missing lock required to access list of apmatrixmdev objects In order to traverse or add/remove apmatrixmdev objects in the matrixdev-mdevlist, the matrixdev-guestslock mutex must be held. There are two function...

PT-2026-93599

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A NULL pointer dereference exists in the vfio ap device driver for s390. The issue occurs within the call stack of the vfio ap on cfg changed and vfio ap on scan complete functions, wher...

CVE-2026-89958: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix dereference matrixmdev-kvm without checking for NULL The apdriver structure has two fields which are function pointers to callbacks: .onconfigchanged: called at the start of the AP bus scan function to notify th...

CVE-2026-89955: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix NULL deref in statusshow during queue probe When vfioapmdevprobequeue creates the sysfs attribute group, the queue's driver data has not yet been set. A concurrent read of the 'status' attribute can therefore ca...

PT-2026-93596

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A NULL pointer dereference occurs in the s390/vfio-ap component during queue probe. When the vfio ap mdev probe queue function creates the sysfs attribute group, the driver data for the...

Linux Distros Unpatched Vulnerability : CVE-2026-89956

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - s390/vfio-ap: Fix missing lock required to access list of apmatrixmdev objects In order to traverse or add/remove apmatrixmdev objects in the matrixdev-mdevlist...

CVE-2026-89956: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix missing lock required to access list of apmatrixmdev objects In order to traverse or add/remove apmatrixmdev objects in the matrixdev-mdevlist, the matrixdev-guestslock mutex must be held. There are two function...

Linux Distros Unpatched Vulnerability : CVE-2026-89958

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - s390/vfio-ap: Fix dereference matrixmdev-kvm without checking for NULL The apdriver structure has two fields which are function pointers to callbacks:...