{"api_version":"1","generated_at":"2026-08-02T16:38:37+00:00","cve":"CVE-2026-64472","urls":{"html":"https://cve.report/CVE-2026-64472","api":"https://cve.report/api/cve/CVE-2026-64472.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64472","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64472"},"summary":{"title":"vfio/mlx5: Fix racy bitfields and tighten struct layout","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/mlx5: Fix racy bitfields and tighten struct layout\n\nBitfield operations are not atomic, they use a read-modify-write\npattern, therefore we should be careful not to pack bitfields that\ncan be concurrently updated into the same storage unit.\n\nThis split takes a binary approach: flags that are only modified\npre/post open/close remain bitfields, flags modified from user\naction, including actions that reach across to another device (ex.\nreset) use dedicated storage units.\n\nNote mlx5_vhca_page_tracker.status is relocated to fill the alignment\nhole this split exposes.\n\nBitfield justifications:\n\n  migrate_cap: written only in mlx5vf_cmd_set_migratable() at probe\n  chunk_mode: written only in mlx5vf_cmd_set_migratable() at probe\n  mig_state_cap: written only in mlx5vf_cmd_set_migratable() at probe\n\nDedicated storage units:\n\n  mdev_detach: written in the VF attach/detach event notifier\n               mlx5fv_vf_event() at runtime\n  log_active: written in mlx5vf_start_page_tracker()/\n              mlx5vf_stop_page_tracker() during runtime dirty tracking\n  deferred_reset: written in mlx5vf_state_mutex_unlock()/\n                  mlx5vf_pci_aer_reset_done() during runtime reset handling\n  is_err: set by tracker error handling and dirty-log polling at runtime\n  object_changed: set by tracker event handling and cleared by dirty-log\n                  polling at runtime","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:32","updated_at":"2026-07-25 10:17:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af","name":"https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb","name":"https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1","name":"https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287","name":"https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be","name":"https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59","name":"https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64472","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64472","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f 1dd99b8f4e143592e12e5a77e7b538bc698116cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f f1db80a67da928a92ba460ede1be52d8941f46be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f 399d806f998f7a25405fc1b97227e579aead24af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f 7ed120b1a007bace57c461805519d70e1af44e59 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f 39d163627b51886492bf31f66cb02c94613d2287 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f f2365a63b02ddea32e7db78b742c2503ec7b81f1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64472","cve":"CVE-2026-64472","epss":"0.001810000","percentile":"0.079690000","score_date":"2026-07-28","updated_at":"2026-07-29 00:05:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/vfio/pci/mlx5/cmd.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1dd99b8f4e143592e12e5a77e7b538bc698116cb","status":"affected","version":"61a2f1460fd03285ea34c1a235f2f50f71e13a1f","versionType":"git"},{"lessThan":"f1db80a67da928a92ba460ede1be52d8941f46be","status":"affected","version":"61a2f1460fd03285ea34c1a235f2f50f71e13a1f","versionType":"git"},{"lessThan":"399d806f998f7a25405fc1b97227e579aead24af","status":"affected","version":"61a2f1460fd03285ea34c1a235f2f50f71e13a1f","versionType":"git"},{"lessThan":"7ed120b1a007bace57c461805519d70e1af44e59","status":"affected","version":"61a2f1460fd03285ea34c1a235f2f50f71e13a1f","versionType":"git"},{"lessThan":"39d163627b51886492bf31f66cb02c94613d2287","status":"affected","version":"61a2f1460fd03285ea34c1a235f2f50f71e13a1f","versionType":"git"},{"lessThan":"f2365a63b02ddea32e7db78b742c2503ec7b81f1","status":"affected","version":"61a2f1460fd03285ea34c1a235f2f50f71e13a1f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/vfio/pci/mlx5/cmd.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc2","versionStartIncluding":"5.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/mlx5: Fix racy bitfields and tighten struct layout\n\nBitfield operations are not atomic, they use a read-modify-write\npattern, therefore we should be careful not to pack bitfields that\ncan be concurrently updated into the same storage unit.\n\nThis split takes a binary approach: flags that are only modified\npre/post open/close remain bitfields, flags modified from user\naction, including actions that reach across to another device (ex.\nreset) use dedicated storage units.\n\nNote mlx5_vhca_page_tracker.status is relocated to fill the alignment\nhole this split exposes.\n\nBitfield justifications:\n\n  migrate_cap: written only in mlx5vf_cmd_set_migratable() at probe\n  chunk_mode: written only in mlx5vf_cmd_set_migratable() at probe\n  mig_state_cap: written only in mlx5vf_cmd_set_migratable() at probe\n\nDedicated storage units:\n\n  mdev_detach: written in the VF attach/detach event notifier\n               mlx5fv_vf_event() at runtime\n  log_active: written in mlx5vf_start_page_tracker()/\n              mlx5vf_stop_page_tracker() during runtime dirty tracking\n  deferred_reset: written in mlx5vf_state_mutex_unlock()/\n                  mlx5vf_pci_aer_reset_done() during runtime reset handling\n  is_err: set by tracker error handling and dirty-log polling at runtime\n  object_changed: set by tracker event handling and cleared by dirty-log\n                  polling at runtime"}],"providerMetadata":{"dateUpdated":"2026-07-25T08:51:35.978Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb"},{"url":"https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be"},{"url":"https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af"},{"url":"https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59"},{"url":"https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287"},{"url":"https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1"}],"title":"vfio/mlx5: Fix racy bitfields and tighten struct layout","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64472","datePublished":"2026-07-25T08:51:35.978Z","dateReserved":"2026-07-19T15:36:31.790Z","dateUpdated":"2026-07-25T08:51:35.978Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:32","lastModifiedDate":"2026-07-25 10:17:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64472","Ordinal":"1","Title":"vfio/mlx5: Fix racy bitfields and tighten struct layout","CVE":"CVE-2026-64472","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64472","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/mlx5: Fix racy bitfields and tighten struct layout\n\nBitfield operations are not atomic, they use a read-modify-write\npattern, therefore we should be careful not to pack bitfields that\ncan be concurrently updated into the same storage unit.\n\nThis split takes a binary approach: flags that are only modified\npre/post open/close remain bitfields, flags modified from user\naction, including actions that reach across to another device (ex.\nreset) use dedicated storage units.\n\nNote mlx5_vhca_page_tracker.status is relocated to fill the alignment\nhole this split exposes.\n\nBitfield justifications:\n\n  migrate_cap: written only in mlx5vf_cmd_set_migratable() at probe\n  chunk_mode: written only in mlx5vf_cmd_set_migratable() at probe\n  mig_state_cap: written only in mlx5vf_cmd_set_migratable() at probe\n\nDedicated storage units:\n\n  mdev_detach: written in the VF attach/detach event notifier\n               mlx5fv_vf_event() at runtime\n  log_active: written in mlx5vf_start_page_tracker()/\n              mlx5vf_stop_page_tracker() during runtime dirty tracking\n  deferred_reset: written in mlx5vf_state_mutex_unlock()/\n                  mlx5vf_pci_aer_reset_done() during runtime reset handling\n  is_err: set by tracker error handling and dirty-log polling at runtime\n  object_changed: set by tracker event handling and cleared by dirty-log\n                  polling at runtime","Type":"Description","Title":"vfio/mlx5: Fix racy bitfields and tighten struct layout"}]}}}