CVE-2026-64472
vfio/mlx5: Fix racy bitfields and tighten struct layout
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
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 61a2f1460fd03285ea34c1a235f2f50f71e13a1f; < 1dd99b8f4e143592e12e5a77e7b538bc698116cb (affected, git) ≥ 61a2f1460fd03285ea34c1a235f2f50f71e13a1f; < f1db80a67da928a92ba460ede1be52d8941f46be (affected, git) ≥ 61a2f1460fd03285ea34c1a235f2f50f71e13a1f; < 399d806f998f7a25405fc1b97227e579aead24af (affected, git) ≥ 61a2f1460fd03285ea34c1a235f2f50f71e13a1f; < 7ed120b1a007bace57c461805519d70e1af44e59 (affected, git) ≥ 61a2f1460fd03285ea34c1a235f2f50f71e13a1f; < 39d163627b51886492bf31f66cb02c94613d2287 (affected, git) ≥ 61a2f1460fd03285ea34c1a235f2f50f71e13a1f; < f2365a63b02ddea32e7db78b742c2503ec7b81f1 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
5.19 (affected) ≥ 0; < 5.19 (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.4; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
NVD applicability configurations (1)
These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.
[
{
"negate": false,
"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": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:*",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
]CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.5 medium |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cbCNA: Linux
- https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46beCNA: Linux
- https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24afCNA: Linux
- https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59CNA: Linux
- https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287CNA: Linux
- https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1CNA: Linux
- https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
- https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
- https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
- https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
- https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
- https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
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