CVE-2026-52953 iommu/vt-d: Fix oops due to out of scope access
A local attacker can trigger a kernel oops and denial of service by killing a QEMU process using VFIO, due to an out-of-scope memory access in the Intel IOMMU driver.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-52953?
CVE-2026-52953 is a high-severity vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Fix oops due to out of scope access
Below oops triggers when kill QEMU process:
Oops: general protection fault, probably for non-canonical address 0x7fffffff844eaaa7: 0000 [#1] SMP NOPTI Call Trace: <TASK> do_raw_spin_lock+0xaa/0xc0 _raw_spin_lock_irqsave+0x21/0x40 domain_remove_dev_pasid+0x52/0x160 intel_nested_set_dev_pasid+0x1b9/0x1e0 __iommu_set_group_pasid+0x56/0x120 pci_dev_reset_iommu_done+0xe3/0x180 pcie_flr+0x65/0x160 __pci_reset_function_locked+0x5b/0x120 vfio_pci_core_close_device+0x63/0xe0 [vfio_pci_core] vfio_df_close+0x4f/0xa0 vfio_df_unbind_iommufd+0x2d/0x60 vfio_device_fops_release+0x3e/0x40 __fput+0xe5/0x2c0 task_work_run+0x58/0xa0 do_exit+0x2c8/0x600 do_group_exit+0x2f/0xa0 get_signal+0x863/0x8c0 arch_do_signal_or_restart+0x24/0x100 exit_to_user_mode_loop+0x87/0x380 do_syscall_64+0x2ff/0x11e0 entry_SYSCALL_64_after_hwframe+0x76/0x7e
The global static blocked domain is a dummy domain without corresponding dmar_domain structure, accessing beyond iommu_domain structure triggers oops easily. Fix it by return early in domain_remove_dev_pasid() like identity domain.
Weakness: CWE-125
Which versions are affected by CVE-2026-52953?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-52953?
Apply the vendor's patch.
Is CVE-2026-52953 being exploited?
There is no known exploitation of CVE-2026-52953 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90534, BELL-CVE-2026-52953, DEBIAN-CVE-2026-52953, GHSA-7jp2-wqvr-vw2w, ROOT-OS-DEBIAN-13-CVE-2026-52953, ROOT-OS-UBUNTU-2404-CVE-2026-52953 and 1 more.