CVE-2026-80687

Summary

In the Linux kernel, the following vulnerability has been resolved:

iommufd/viommu: Release the igroup lock on the vdevice_size error path

iommufd_vdevice_alloc_ioctl() takes idev->igroup->lock, then validates the driver's vdevice_size against the core structure size with a WARN_ON_ONCE. On failure that guard jumps to out_put_idev, below out_unlock_igroup, so it skips the mutex_unlock(), leaving the igroup lock held and deadlocking the next vDEVICE operation on that group.

Jump to out_unlock_igroup instead.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxed42eee797ff3dc889ade63c1dd7c4f430699e23 < 294b464b2be7e57872864cb6936e1d9c7294f89daffected
LinuxLinuxed42eee797ff3dc889ade63c1dd7c4f430699e23 < ca9e49e1c8931a4e6e743a1f1d2e7f977f774b86affected
LinuxLinuxed42eee797ff3dc889ade63c1dd7c4f430699e23 < 339bd11591593ab7ce88136ab7fd01ef3813b724affected
LinuxLinux6.17affected
LinuxLinux0 < 6.17unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References