CVE-2026-64591 is a vulnerability in Linux Kernel
Published on August 6, 2026
iommu/vt-d: Avoid WARNING in sva unbind path
In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Avoid WARNING in sva unbind path
The Intel IOMMU driver allows SVA on devices even if they do not support
PCI/PRI. Commit 39c20c4e83b9 ("iommu/vt-d: Only handle IOPF for SVA when
PRI is supported") modified the SVA bind path to allow this configuration
by skipping IOPF enablement when PRI is missing. However, it failed to
update the unbind path.
This creates an imbalance: the unbind path attempts to disable IOPF for
a device that never had it enabled, triggering a WARNING in
intel_iommu_disable_iopf():
WARNING: drivers/iommu/intel/iommu.c:3475 at intel_iommu_disable_iopf+0x4f/0x90d
Call Trace:
<TASK>
blocking_domain_set_dev_pasid+0x50/0x70
iommu_detach_device_pasid+0x89/0xc0
iommu_sva_unbind_device+0x73/0x150
xe_vm_close_and_put+0x4d2/0x1200 [xe]
Fix this by bypassing IOPF operations for SVA domains on non-PRI hardware
in both the bind and unbind paths.
Products Associated with CVE-2026-64591
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version ee312bb1052e45cbccaf6abac1012db9ca43150a and below bb354384f40bb087e7c44f0f0743a23fc945f91d is affected.
- Version 39c20c4e83b9f78988541d829aa34668904e54a0 and below 477f8dec3b5ae54e8ef3c33bdd2257e47896512e is affected.
- Version 39c20c4e83b9f78988541d829aa34668904e54a0 and below 534b5f98ab7319d8004bbc7dab6481462243e883 is affected.
- Version 46461dabb95239aa05e31e247cd21151b8406642 is affected.
- Version 6.18.20 and below 6.18.39 is affected.
- Version 6.19.10 and below 6.20 is affected.
- Version 7.0 is affected.
- Before 7.0 is unaffected.
- Version 6.18.39, <= 6.18.* is unaffected.
- Version 7.1.4, <= 7.1.* is unaffected.
- Version 7.2-rc1, <= * is unaffected.