{"id":"CVE-2026-93238","revision":"1cb6f7c68ba2468892b4f3042b757670","records":[{"revision":"1cb6f7c68ba2468892b4f3042b757670","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93238","aliases":[],"title":"s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap","description":"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().","state":0,"publishedAt":"2026-09-24T15:34:11.543+00:00","modifiedAt":"2026-10-19T09:07:49.811+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/s390/crypto/vfio_ap_ops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182\",\n                            \"lessThan\": \"4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182\",\n                            \"lessThan\": \"f73db632524320d2b93bc8534be8ea875053502d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182\",\n                            \"lessThan\": \"6d554f2571e6b4db242593ba561efd6a6d1f99a9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182\",\n                            \"lessThan\": \"09548edc6114f1eb1035b30795e893204ef45b85\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eeb386aeb5b7c8d2dae6a3ba49255d8a97803182\",\n                            \"lessThan\": \"bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/s390/crypto/vfio_ap_ops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2","https://git.kernel.org/stable/c/f73db632524320d2b93bc8534be8ea875053502d","https://git.kernel.org/stable/c/6d554f2571e6b4db242593ba561efd6a6d1f99a9","https://git.kernel.org/stable/c/09548edc6114f1eb1035b30795e893204ef45b85","https://git.kernel.org/stable/c/bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93238","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93238","identifiers":["CVE-2026-93238"]},"retained":false,"historicalAffected":[]}],"coverage":[]}