CVE-2026-64472vfio/mlx5: Fix racy bitfields and tighten struct layout
- 5.5MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
- 6 days later
· 6 days later
First scored
Medium 5.5
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 94% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f – < 1dd99b8f4e143592e12e5a77e7b538bc698116cb
- affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f – < f1db80a67da928a92ba460ede1be52d8941f46be
- affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f – < 399d806f998f7a25405fc1b97227e579aead24af
- affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f – < 7ed120b1a007bace57c461805519d70e1af44e59
- affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f – < 39d163627b51886492bf31f66cb02c94613d2287
- affected 61a2f1460fd03285ea34c1a235f2f50f71e13a1f – < f2365a63b02ddea32e7db78b742c2503ec7b81f1
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb (opens in a new tab)
- https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be (opens in a new tab)
- https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af (opens in a new tab)
- https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59 (opens in a new tab)
- https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287 (opens in a new tab)
- https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48816 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64472)Record last updated .