CVE-2026-64472None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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
Linux >= 61a2f1460fd03285ea34c1a235f2f50f71e13a1f < 1dd99b8f4e143592e12e5a77e7b538bc698116cbLinux >= 61a2f1460fd03285ea34c1a235f2f50f71e13a1f < f1db80a67da928a92ba460ede1be52d8941f46beLinux >= 61a2f1460fd03285ea34c1a235f2f50f71e13a1f < 399d806f998f7a25405fc1b97227e579aead24afLinux >= 61a2f1460fd03285ea34c1a235f2f50f71e13a1f < 7ed120b1a007bace57c461805519d70e1af44e59Linux >= 61a2f1460fd03285ea34c1a235f2f50f71e13a1f < 39d163627b51886492bf31f66cb02c94613d2287Linux >= 61a2f1460fd03285ea34c1a235f2f50f71e13a1f < f2365a63b02ddea32e7db78b742c2503ec7b81f1Linux 5.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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