From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-52953: iommu/vt-d: Fix oops due to out of scope access
Date: Wed, 24 Jun 2026 17:29:37 +0100 [thread overview]
Message-ID: <2026062434-CVE-2026-52953-69a6@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
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.
The Linux kernel CVE team has assigned CVE-2026-52953 to this issue.
Affected and fixed versions
===========================
Issue introduced in 6.6 with commit 7d0c9da6c1509664d96488042bacc02308ca33b2 and fixed in 6.18.33 with commit 88397fad7914ee74a7880fa5ce01f9eb6bfe0743
Issue introduced in 6.6 with commit 7d0c9da6c1509664d96488042bacc02308ca33b2 and fixed in 7.0.10 with commit 1e659db468476733d217c1314c1e0d9244356d6c
Issue introduced in 6.6 with commit 7d0c9da6c1509664d96488042bacc02308ca33b2 and fixed in 7.1 with commit a6dea58d8625c06b9654c0555f101742481335c3
Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.
Unaffected versions might change over time as fixes are backported to
older supported kernel versions. The official CVE entry at
https://cve.org/CVERecord/?id=CVE-2026-52953
will be updated if fixes are backported, please check that for the most
up to date information about this issue.
Affected files
==============
The file(s) affected by this issue are:
drivers/iommu/intel/iommu.c
Mitigation
==========
The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes. Individual
changes are never tested alone, but rather are part of a larger kernel
release. Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all. If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
https://git.kernel.org/stable/c/88397fad7914ee74a7880fa5ce01f9eb6bfe0743
https://git.kernel.org/stable/c/1e659db468476733d217c1314c1e0d9244356d6c
https://git.kernel.org/stable/c/a6dea58d8625c06b9654c0555f101742481335c3
reply other threads:[~2026-06-24 16:32 UTC|newest]
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