s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap
In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap The DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap on the stack without zero-initializing it. In vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function is only called to initialize and populate apm_filtered if either filter_adapters or filter_domains is true. If the hot plug configuration change only adds control domains (meaning filter_cdoms is true, but filter_adapters and filter_domains are both false), vfio_ap_mdev_filter_matrix() is bypassed. Consequently, apm_filtered is passed to reset_queues_for_apids() with uninitialized stack garbage. This can cause reset_queues_for_apids() to interpret arbitrary stack garbage bits as valid APIDs to reset, potentially performing unintended guest hardware queue resets. Fix this by zero-initializing the apm_filtered bitmap at the beginning of vfio_ap_mdev_hot_plug_cfg() using bitmap_zero().
CVE-2026-93238
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-2026-93238
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": "4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "f73db632524320d2b93bc8534be8ea875053502d",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "6d554f2571e6b4db242593ba561efd6a6d1f99a9",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "09548edc6114f1eb1035b30795e893204ef45b85",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7",
"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": "6.6.157",
"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-2026-93238
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37936 · Revision 1
- Added to Heist Feed
- Publisher date