Skip to content
Heist/ feed
UnratedFix available

vfio/mlx5: Fix racy bitfields and tighten struct layout

Type: advisorySource: OSV1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-64472

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:CVE-2026-64472

Kernel

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
6.1.178

Source reference: /affected/1/ranges

6.6.145

Source reference: /affected/1/ranges

6.12.97

Source reference: /affected/1/ranges

6.18.40

Source reference: /affected/1/ranges

7.1.4

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
        "type": "GIT",
        "events": [
          {
            "introduced": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f"
          },
          {
            "fixed": "1dd99b8f4e143592e12e5a77e7b538bc698116cb"
          },
          {
            "fixed": "f1db80a67da928a92ba460ede1be52d8941f46be"
          },
          {
            "fixed": "399d806f998f7a25405fc1b97227e579aead24af"
          },
          {
            "fixed": "7ed120b1a007bace57c461805519d70e1af44e59"
          },
          {
            "fixed": "39d163627b51886492bf31f66cb02c94613d2287"
          },
          {
            "fixed": "f2365a63b02ddea32e7db78b742c2503ec7b81f1"
          }
        ]
      }
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64472.json"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "5.19.0"
          },
          {
            "fixed": "6.1.178"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.2.0"
          },
          {
            "fixed": "6.6.145"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.7.0"
          },
          {
            "fixed": "6.12.97"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.13.0"
          },
          {
            "fixed": "6.18.40"
          }
        ]
      },
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "6.19.0"
          },
          {
            "fixed": "7.1.4"
          }
        ]
      }
    ],
    "package": {
      "name": "Kernel",
      "ecosystem": "Linux"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64472.json"
    }
  }
]
Related CVEs
CVE-2026-64472

Source reference: /id

Publisher severity

No explicit severity was provided.

Event
#50696 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement