{"schema":"threatline.record/2","record":{"id":"CVE-2026-93238","aliases":[],"summary":"s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap\n\nThe DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap\non the stack without zero-initializing it.\n\nIn vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function\nis only called to initialize and populate apm_filtered if either\nfilter_adapters or filter_domains is true. If the hot plug configuration\nchange only adds control domains (meaning filter_cdoms is true, but\nfilter_adapters and filter_domains are both false),\nvfio_ap_mdev_filter_matrix() is bypassed.\n\nConsequently, apm_filtered is passed to reset_queues_for_apids() with\nuninitialized stack garbage. This can cause reset_queues_for_apids() to\ninterpret arbitrary stack garbage bits as valid APIDs to reset, potentially\nperforming unintended guest hardware queue resets.\n\nFix this by zero-initializing the apm_filtered bitmap at the beginning of\nvfio_ap_mdev_hot_plug_cfg() using bitmap_zero().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93238","source_modified_at":"2026-10-19T09:07:49.811Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182","lessThan":"4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2","status":"affected","versionType":"git"},{"version":"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182","lessThan":"f73db632524320d2b93bc8534be8ea875053502d","status":"affected","versionType":"git"},{"version":"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182","lessThan":"6d554f2571e6b4db242593ba561efd6a6d1f99a9","status":"affected","versionType":"git"},{"version":"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182","lessThan":"09548edc6114f1eb1035b30795e893204ef45b85","status":"affected","versionType":"git"},{"version":"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182","lessThan":"bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93238","source_modified_at":"2026-10-19T09:07:49.811Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.51","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.5","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93238","source_modified_at":"2026-10-19T09:07:49.811Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93238","source_modified_at":"2026-10-19T09:07:49.811Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6d554f2571e6b4db242593ba561efd6a6d1f99a9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93238","source_modified_at":"2026-10-19T09:07:49.811Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"09548edc6114f1eb1035b30795e893204ef45b85","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.0021,"percentile":0.10645,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:34:11.543Z","modified_at":"2026-10-19T09:07:49.811Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93238","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:07:49.811Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93238","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f73db632524320d2b93bc8534be8ea875053502d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6d554f2571e6b4db242593ba561efd6a6d1f99a9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/09548edc6114f1eb1035b30795e893204ef45b85"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:07:49.811Z","content_hash":"57760a94bd5cc41c96f2f53d9ca341fcb343848768fb7023fb4ab3ef5e2cccfa"}}