{"id":"CVE-2026-64474","summary":"vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc\n\nvfio_mig_get_next_state() walks vfio_from_fsm_table[] one step at a time,\nlooping to skip optional states the device does not support until\n*next_fsm is supported. A blocked transition is encoded as\nVFIO_DEVICE_STATE_ERROR, which the trailing return reports as -EINVAL.\n\nThe skip loop does not account for the ERROR sentinel.\nstate_flags_table[ERROR] is ~0U and vfio_from_fsm_table[ERROR][*] is\nERROR, so once *next_fsm becomes ERROR the loop condition stays true and\n*next_fsm never changes. The blocked arcs STOP_COPY -\u003e PRE_COPY and\nSTOP_COPY -\u003e PRE_COPY_P2P map to ERROR yet pass the support check on a\nprecopy-capable device, causing the loop to spin forever while holding\nthe driver state mutex. This can result in a soft lockup, and a panic\nwith softlockup_panic set.\n\nTerminate the skip loop on the ERROR sentinel so a blocked transition\nfalls through to the existing return and reports -EINVAL.","modified":"2026-07-27T04:03:22.513718305Z","published":"2026-07-25T08:51:37.405Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64474.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64474.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64474"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4db52602a6074e9cc523500b8304600ff63e7b85"},{"fixed":"8e872c07e40d51a66dee7b280a23a460a2e1e3fa"},{"fixed":"ed7d5599e6c398da74845767cd1e6a8370a160fc"},{"fixed":"7f2d6b31089e48db4653df832c9a6afdde9a1c29"},{"fixed":"a3a8afa2f6e7f0dc266d08f02be3f3054241ba47"},{"fixed":"a26b499b757cfc8bbff1088bb1b844639e250893"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64474.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64474.json"}}],"schema_version":"1.7.5"}