CVE-2026-64472 (GCVE-0-2026-64472)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
EPSS
VEX
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
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/vfio/pci/mlx5/cmd.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
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"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
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"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
"lessThan": "7ed120b1a007bace57c461805519d70e1af44e59",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
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"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
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"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/vfio/pci/mlx5/cmd.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"lessThan": "5.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.19",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:56:18.199Z",
"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",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64472",
"datePublished": "2026-07-25T08:51:35.978Z",
"dateReserved": "2026-07-19T15:36:31.790Z",
"dateUpdated": "2026-08-17T04:56:18.199Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64472",
"date": "2026-09-29",
"epss": "0.00181",
"percentile": "0.06868"
},
"microsoft_vex": {
"current_release_date": "2026-07-27T14:43:27.000Z",
"cve": "CVE-2026-64472",
"id": "msrc_CVE-2026-64472",
"initial_release_date": "2026-07-26T01:12:41.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "vfio/mlx5: Fix racy bitfields and tighten struct layout",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64472.json",
"version": "2"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/vfio/pci/mlx5/cmd.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "1dd99b8f4e143592e12e5a77e7b538bc698116cb",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
"lessThan": "f1db80a67da928a92ba460ede1be52d8941f46be",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
"lessThan": "399d806f998f7a25405fc1b97227e579aead24af",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
"lessThan": "7ed120b1a007bace57c461805519d70e1af44e59",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
"lessThan": "39d163627b51886492bf31f66cb02c94613d2287",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
},
{
"lessThan": "f2365a63b02ddea32e7db78b742c2503ec7b81f1",
"status": "affected",
"version": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/vfio/pci/mlx5/cmd.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"lessThan": "5.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"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"
}
],
"id": "CVE-2026-64472",
"lastModified": "2026-08-17T05:17:52.820",
"metrics": {},
"published": "2026-07-25T10:17:32.630",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-29T11:47:25+00:00",
"cve": "CVE-2026-64472",
"id": "CVE-2026-64472",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: vfio/mlx5: Fix racy bitfields and tighten struct layout",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64472.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-22T16:52:59Z",
"cve": "CVE-2026-64472",
"id": "CVE-2026-64472",
"initial_release_date": "2026-07-25T15:58:41Z",
"product_status:first_fixed": "60",
"product_status:known_affected": "540",
"product_status:known_not_affected": "193",
"product_status:recommended": "111",
"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": "13"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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