Linux Kernel IOMMU NULL Domain Deref Crash in pci_dev_reset_iommu_done
CVE-2026-53280 Published on June 26, 2026
iommu: Fix NULL group->domain dereference in pci_dev_reset_iommu_done()
In the Linux kernel, the following vulnerability has been resolved:
iommu: Fix NULL group->domain dereference in pci_dev_reset_iommu_done()
Local sashiko review pointed it out that group->domain could be NULL when
a default domain fails to allocate during the first probe, which can crash
at domain->ops->attach_dev dereference in __iommu_attach_device() invoked
by pci_dev_reset_iommu_done().
pci_dev_reset_iommu_prepare() is fine as an old_domain pointer can be NULL.
Skip the re-attach in pci_dev_reset_iommu_done() to fix the bug.
Products Associated with CVE-2026-53280
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Affected Versions
Linux:- Version c279e83953d937470f8a6e69b69f62608714f13f and below 17194cd0dd236e732d116d50840d795ca50ef196 is affected.
- Version c279e83953d937470f8a6e69b69f62608714f13f and below d769711fcddd005f1e654b3bde547140917fe696 is affected.
- Version 7.0 is affected.
- Before 7.0 is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.