CVE-2026-64474vfio: prevent infinite loop in vfio_mig_get_next_state() on blocked arc
- 5.5MediumCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 93% 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: prevent infinite loop in vfio_mig_get_next_state() on blocked arc vfio_mig_get_next_state() walks vfio_from_fsm_table[] one step at a time, looping to skip optional states the device does not support until *next_fsm is supported. A blocked transition is encoded as VFIO_DEVICE_STATE_ERROR, which the trailing return reports as -EINVAL. The skip loop does not account for the ERROR sentinel. state_flags_table[ERROR] is ~0U and vfio_from_fsm_table[ERROR][*] is ERROR, so once *next_fsm becomes ERROR the loop condition stays true and *next_fsm never changes. The blocked arcs STOP_COPY -> PRE_COPY and STOP_COPY -> PRE_COPY_P2P map to ERROR yet pass the support check on a precopy-capable device, causing the loop to spin forever while holding the driver state mutex. This can result in a soft lockup, and a panic with softlockup_panic set. Terminate the skip loop on the ERROR sentinel so a blocked transition falls through to the existing return and reports -EINVAL.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 23 days later
· 23 days later
Record updated
- 3 months later
· 3 months 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)
- 0.18% · top 93% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 4db52602a6074e9cc523500b8304600ff63e7b85 – < 8e872c07e40d51a66dee7b280a23a460a2e1e3fa
- affected 4db52602a6074e9cc523500b8304600ff63e7b85 – < ed7d5599e6c398da74845767cd1e6a8370a160fc
- affected 4db52602a6074e9cc523500b8304600ff63e7b85 – < 7f2d6b31089e48db4653df832c9a6afdde9a1c29
- affected 4db52602a6074e9cc523500b8304600ff63e7b85 – < a3a8afa2f6e7f0dc266d08f02be3f3054241ba47
- affected 4db52602a6074e9cc523500b8304600ff63e7b85 – < a26b499b757cfc8bbff1088bb1b844639e250893
- affected 6.2
- unaffected < 6.2
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/8e872c07e40d51a66dee7b280a23a460a2e1e3fa (opens in a new tab)
- https://git.kernel.org/stable/c/ed7d5599e6c398da74845767cd1e6a8370a160fc (opens in a new tab)
- https://git.kernel.org/stable/c/7f2d6b31089e48db4653df832c9a6afdde9a1c29 (opens in a new tab)
- https://git.kernel.org/stable/c/a3a8afa2f6e7f0dc266d08f02be3f3054241ba47 (opens in a new tab)
- https://git.kernel.org/stable/c/a26b499b757cfc8bbff1088bb1b844639e250893 (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-2026-48818 (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-2026-64474)Record last updated .