{"id":"CVE-2026-64474","state":"PUBLISHED","title":"vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc","description":"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 -> PRE_COPY and\nSTOP_COPY -> 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.","publishedAt":"2026-07-25T08:51:37.405Z","updatedAt":"2026-08-17T04:56:20.392Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"8e872c07e40d51a66dee7b280a23a460a2e1e3fa","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"ed7d5599e6c398da74845767cd1e6a8370a160fc","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"7f2d6b31089e48db4653df832c9a6afdde9a1c29","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"a3a8afa2f6e7f0dc266d08f02be3f3054241ba47","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"a26b499b757cfc8bbff1088bb1b844639e250893","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_main.c"]}],"references":["https://git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa","https://git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc","https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29","https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47","https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64474.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64474","state":"PUBLISHED","datePublished":"2026-07-25T08:51:37.405Z","dateUpdated":"2026-08-17T04:56:20.392Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.790Z"},"containers":{"cna":{"title":"vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc","descriptions":[{"lang":"en","value":"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 -> PRE_COPY and\nSTOP_COPY -> 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"8e872c07e40d51a66dee7b280a23a460a2e1e3fa","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"ed7d5599e6c398da74845767cd1e6a8370a160fc","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"7f2d6b31089e48db4653df832c9a6afdde9a1c29","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"a3a8afa2f6e7f0dc266d08f02be3f3054241ba47","versionType":"git"},{"version":"4db52602a6074e9cc523500b8304600ff63e7b85","status":"affected","lessThan":"a26b499b757cfc8bbff1088bb1b844639e250893","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/vfio_main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa"},{"url":"https://git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc"},{"url":"https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29"},{"url":"https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47"},{"url":"https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:56:20.392Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}