Answer in brief
CVE-2026-64472 records a Unknown severity vulnerability in vfio/mlx5: Fix racy bitfields and tighten struct layout. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <1dd99b8f4e143592e12e5a77e7b538bc698116cb || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f1db80a67da928a92ba460ede1be52d8941f46be || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <399d806f998f7a25405fc1b97227e579aead24af || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <7ed120b1a007bace57c461805519d70e1af44e59 || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <39d163627b51886492bf31f66cb02c94613d2287 || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f2365a63b02ddea32e7db78b742c2503ec7b81f1 | 1dd99b8f4e143592e12e5a77e7b538bc698116cb, f1db80a67da928a92ba460ede1be52d8941f46be, 399d806f998f7a25405fc1b97227e579aead24af, 7ed120b1a007bace57c461805519d70e1af44e59, 39d163627b51886492bf31f66cb02c94613d2287, f2365a63b02ddea32e7db78b742c2503ec7b81f1 |
| Linux/Linuxgeneric | 5.19 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
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
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64472 records a Unknown severity vulnerability in vfio/mlx5: Fix racy bitfields and tighten struct layout. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <1dd99b8f4e143592e12e5a77e7b538bc698116cb || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f1db80a67da928a92ba460ede1be52d8941f46be || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <399d806f998f7a25405fc1b97227e579aead24af || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <7ed120b1a007bace57c461805519d70e1af44e59 || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <39d163627b51886492bf31f66cb02c94613d2287 || >=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f2365a63b02ddea32e7db78b742c2503ec7b81f1 | 1dd99b8f4e143592e12e5a77e7b538bc698116cb, f1db80a67da928a92ba460ede1be52d8941f46be, 399d806f998f7a25405fc1b97227e579aead24af, 7ed120b1a007bace57c461805519d70e1af44e59, 39d163627b51886492bf31f66cb02c94613d2287, f2365a63b02ddea32e7db78b742c2503ec7b81f1 |
| Linux/Linuxgeneric | 5.19 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
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
Quoted source text, attributed separately from HOL analysis.