s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93238
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:19 UTC
Updated2026-09-24 16:17:19 UTC
DescriptionIn 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().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2 git Not specified
CNA Linux Linux affected eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 f73db632524320d2b93bc8534be8ea875053502d git Not specified
CNA Linux Linux affected eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 6d554f2571e6b4db242593ba561efd6a6d1f99a9 git Not specified
CNA Linux Linux affected eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 09548edc6114f1eb1035b30795e893204ef45b85 git Not specified
CNA Linux Linux affected eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6d554f2571e6b4db242593ba561efd6a6d1f99a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f73db632524320d2b93bc8534be8ea875053502d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09548edc6114f1eb1035b30795e893204ef45b85 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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