CVE-2026-64472
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: vfio/mlx5: Fix racy bitfields and tighten struct layout Bitfield operations are not atomic, they use a read-modify-write pattern, therefore we should be careful not to pack bitfields that can be concurrently updated into the same storage unit. This split takes a binary approach: flags that are only modified pre/post open/close remain bitfields, flags modified from user action, including actions that reach across to another device (ex. reset) use dedicated storage units. Note mlx5_vhca_page_tracker.status is relocated to fill the alignment hole this split exposes. Bitfield justifications: migrate_cap: written only in mlx5vf_cmd_set_migratable() at probe chunk_mode: written only in mlx5vf_cmd_set_migratable() at probe mig_state_cap: written only in mlx5vf_cmd_set_migratable() at probe Dedicated storage units: mdev_detach: written in the VF attach/detach event notifier mlx5fv_vf_event() at runtime log_active: written in mlx5vf_start_page_tracker()/ mlx5vf_stop_page_tracker() during runtime dirty tracking deferred_reset: written in mlx5vf_state_mutex_unlock()/ mlx5vf_pci_aer_reset_done() during runtime reset handling is_err: set by tracker error handling and dirty-log polling at runtime object_changed: set by tracker event handling and cleared by dirty-log polling at runtime
View original CVE JSON
{
"id": "CVE-2026-64472",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-25T10:17:32.630",
"lastModified": "2026-11-03T18:15:39.353",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"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"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/vfio/pci/mlx5/cmd.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"lessThan": "1dd99b8f4e143592e12e5a77e7b538bc698116cb",
"versionType": "git",
"status": "affected"
},
{
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"lessThan": "f1db80a67da928a92ba460ede1be52d8941f46be",
"versionType": "git",
"status": "affected"
},
{
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"lessThan": "399d806f998f7a25405fc1b97227e579aead24af",
"versionType": "git",
"status": "affected"
},
{
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"lessThan": "7ed120b1a007bace57c461805519d70e1af44e59",
"versionType": "git",
"status": "affected"
},
{
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"lessThan": "39d163627b51886492bf31f66cb02c94613d2287",
"versionType": "git",
"status": "affected"
},
{
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"lessThan": "f2365a63b02ddea32e7db78b742c2503ec7b81f1",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/vfio/pci/mlx5/cmd.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.19",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.178",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.145",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.97",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.40",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1.4",
"lessThanOrEqual": "7.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}