CVE-2026-46036 (GCVE-0-2026-46036)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-05-30 10:46
VLAI
Title
vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
Summary
In the Linux kernel, the following vulnerability has been resolved: vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex vfio_cdx_set_msi_trigger() reads vdev->config_msi and operates on the vdev->cdx_irqs array based on its value, but provides no serialization against concurrent VFIO_DEVICE_SET_IRQS ioctls. Two callers can race such that one observes config_msi as set while another clears it and frees cdx_irqs via vfio_cdx_msi_disable(), resulting in a use-after-free of the cdx_irqs array. Add a cdx_irqs_lock mutex to struct vfio_cdx_device and acquire it in vfio_cdx_set_msi_trigger(), which is the single chokepoint through which all updates to config_msi, cdx_irqs, and msi_count flow, covering both the ioctl path and the close-device cleanup path. This keeps the test of config_msi atomic with the subsequent enable, disable, or trigger operations. Drop the pre-call !cdx_irqs test from vfio_cdx_irqs_cleanup() as part of this change: the optimization it provided is redundant with the !config_msi early-return inside vfio_cdx_msi_disable(), and leaving the test in place would be an unsynchronized read of state the new lock is meant to protect.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < ddf96e23c366c566283fce8377928851fa7f5e81 (git)
Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 7b436ade16cc81095d79b79f8efa3af0a4f5c5a2 (git)
Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 7530f34ec0ca1438d45a75dcb43183a1cc92eced (git)
Affected: 848e447e000c41894ff931dc7c004fd42c8840f8 , < 670e8864b1a218d72f08db40d0103adf38fa1d9b (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)
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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.

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