Vulnerability-Lookup

CVE-2026-64472 (GCVE-0-2026-64472)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

vfio/mlx5: Fix racy bitfields and tighten struct layout

Summary

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

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/1dd99b8f4e143592e…
https://git.kernel.org/stable/c/f1db80a67da928a92…
https://git.kernel.org/stable/c/399d806f998f7a254…
https://git.kernel.org/stable/c/7ed120b1a007bace5…
https://git.kernel.org/stable/c/39d163627b5188649…
https://git.kernel.org/stable/c/f2365a63b02ddea32…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 61a2f1460fd03285ea34c1a235f2f50f71e13a1f , < 1dd99b8f4e143592e12e5a77e7b538bc698116cb (git) Affected: 61a2f1460fd03285ea34c1a235f2f50f71e13a1f , < f1db80a67da928a92ba460ede1be52d8941f46be (git) Affected: 61a2f1460fd03285ea34c1a235f2f50f71e13a1f , < 399d806f998f7a25405fc1b97227e579aead24af (git) Affected: 61a2f1460fd03285ea34c1a235f2f50f71e13a1f , < 7ed120b1a007bace57c461805519d70e1af44e59 (git) Affected: 61a2f1460fd03285ea34c1a235f2f50f71e13a1f , < 39d163627b51886492bf31f66cb02c94613d2287 (git) Affected: 61a2f1460fd03285ea34c1a235f2f50f71e13a1f , < f2365a63b02ddea32e7db78b742c2503ec7b81f1 (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc2 , ≤ * (original_commit_for_fix)

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{
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        {
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          "product": "Linux",
          "programFiles": [
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc2",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
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              "cpeMatch": [
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          "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",
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    "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"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64472",
      "date": "2026-07-26",
      "epss": "0.00181",
      "percentile": "0.07932"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64472\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:32.630\",\"lastModified\":\"2026-07-25T10:17:32.630\",\"vulnStatus\":\"Received\",\"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-rc2\",\"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\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:41Z",
      "cve": "CVE-2026-64472",
      "id": "CVE-2026-64472",
      "initial_release_date": "2026-07-25T15:58:41Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64472",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64472.json",
      "version": "2"
    }
  }
}

GHSA-3WRG-MVH6-9V25

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64472"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:32Z",
    "severity": null
  },
  "details": "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",
  "id": "GHSA-3wrg-mvh6-9v25",
  "modified": "2026-07-25T12:31:37Z",
  "published": "2026-07-25T12:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64472"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64472 (GCVE-0-2026-64472)

GHSA-3WRG-MVH6-9V25

Tags

Sightings

Nomenclature