Bug 2525433 (CVE-2026-80687)

Summary: CVE-2026-80687 kernel: iommufd/viommu: Release the igroup lock on the vdevice_size error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's iommufd/viommu component. An error in the `iommufd_vdevice_alloc_ioctl()` function's error handling path can lead to a lock being held indefinitely. This can cause a deadlock, preventing further virtual device (vDEVICE) operations and resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-28 07:44:44 UTC 
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.
Comment 1 gkamathe 2026-09-01 09:20:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082802-CVE-2026-80687-5886@gregkh/T