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 vfio_ap_mdev_hot_unplug_cfg() function uses the return value of bitmap_andnot() to determine whether the guest APCB needs to be updated. However, bitmap_andnot() returns false when the resulting destination bitmap is empty. This means that if the only adapter, domain or control domain assigned to an mdev is removed from the host's AP configuration, the bit is correctly cleared from the shadow APCB, but bitmap_andnot() returns false because the result is an empty bitmap. Consequently, do_hotplug remains 0 and vfio_ap_mdev_update_guest_apcb() is never called, leaving the KVM guest with stale hardware access to the unplugged AP devices. Fix this by replacing the bitmap_andnot() return value check with bitmap_intersects() to determine whether the shadow APCB actually overlaps with the removal mask. If there is an intersection, call bitmap_andnot() solely for its side effect of clearing the bits, then unconditionally set do_hotplug to trigger the guest APCB update.
CVE-2026-89957
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89957
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "f58e824de8577fe411f6199d659731a0f86a7275",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "3a9b049bbdc40165d7f3e20b818eec95e5694d96",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "753aa3bb1273bc0d36adb013d5915cc8ff6b72a9",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "c45753c32d452d10d8efaeb52587e9e6e8126e33",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "04b35dd88c108b2d2ceaaa396aba1cb4049d5831",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "917f509bfb88048094dbb85c4e9dbc4d6fe4a886",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/crypto/vfio_ap_ops.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/s390/crypto/vfio_ap_ops.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89957
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36397 · Revision 1
- Added to Heist Feed
- Publisher date