In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Remove cache tags before disabling ATS
The current implementation removes cache tags after disabling ATS,
leading to potential memory leaks and kernel crashes. Specifically,
CACHE_TAG_DEVTLB type cache tags may still remain in the list even
after the domain is freed, causing a use-after-free condition.
This issue really shows up when multiple VFs from different PFs
passed through to a single user-space process via vfio-pci. In such
cases, the kernel may crash with kernel messages like:
BUG: kernel NULL pointer dereference, address: 0000000000000014
PGD 19036a067 P4D 1940a3067 PUD 136c9b067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 74 UID: 0 PID: 3183 Comm: testCli Not tainted 6.11.9 #2
RIP: 0010:cache_tag_flush_range+0x9b/0x250
Call Trace:
<TASK>
? __die+0x1f/0x60
? page_fault_oops+0x163/0x590
? exc_page_fault+0x72/0x190
? asm_exc_page_fault+0x22/0x30
? cache_tag_flush_range+0x9b/0x250
? cache_tag_flush_range+0x5d/0x250
intel_iommu_tlb_sync+0x29/0x40
intel_iommu_unmap_pages+0xfe/0x160
__iommu_unmap+0xd8/0x1a0
vfio_unmap_unpin+0x182/0x340 [vfio_iommu_type1]
vfio_remove_dma+0x2a/0xb0 [vfio_iommu_type1]
vfio_iommu_type1_ioctl+0xafa/0x18e0 [vfio_iommu_type1]
Move cache_tag_unassign_domain() before iommu_disable_pci_caps() to fix
it.
Metrics
Affected Vendors & Products
References
History
Mon, 06 Jan 2025 18:45:00 +0000
Type | Values Removed | Values Added |
---|---|---|
First Time appeared |
Linux
Linux linux Kernel |
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Weaknesses | CWE-401 CWE-416 CWE-476 |
|
CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* |
|
Vendors & Products |
Linux
Linux linux Kernel |
|
Metrics |
cvssV3_1
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cvssV3_1
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Sat, 28 Dec 2024 13:30:00 +0000
Type | Values Removed | Values Added |
---|---|---|
References |
| |
Metrics |
threat_severity
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cvssV3_1
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Fri, 27 Dec 2024 15:15:00 +0000
Type | Values Removed | Values Added |
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Description | In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Remove cache tags before disabling ATS The current implementation removes cache tags after disabling ATS, leading to potential memory leaks and kernel crashes. Specifically, CACHE_TAG_DEVTLB type cache tags may still remain in the list even after the domain is freed, causing a use-after-free condition. This issue really shows up when multiple VFs from different PFs passed through to a single user-space process via vfio-pci. In such cases, the kernel may crash with kernel messages like: BUG: kernel NULL pointer dereference, address: 0000000000000014 PGD 19036a067 P4D 1940a3067 PUD 136c9b067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 74 UID: 0 PID: 3183 Comm: testCli Not tainted 6.11.9 #2 RIP: 0010:cache_tag_flush_range+0x9b/0x250 Call Trace: <TASK> ? __die+0x1f/0x60 ? page_fault_oops+0x163/0x590 ? exc_page_fault+0x72/0x190 ? asm_exc_page_fault+0x22/0x30 ? cache_tag_flush_range+0x9b/0x250 ? cache_tag_flush_range+0x5d/0x250 intel_iommu_tlb_sync+0x29/0x40 intel_iommu_unmap_pages+0xfe/0x160 __iommu_unmap+0xd8/0x1a0 vfio_unmap_unpin+0x182/0x340 [vfio_iommu_type1] vfio_remove_dma+0x2a/0xb0 [vfio_iommu_type1] vfio_iommu_type1_ioctl+0xafa/0x18e0 [vfio_iommu_type1] Move cache_tag_unassign_domain() before iommu_disable_pci_caps() to fix it. | |
Title | iommu/vt-d: Remove cache tags before disabling ATS | |
References |
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-12-27T15:06:30.792Z
Updated: 2024-12-27T15:06:30.792Z
Reserved: 2024-12-27T15:00:39.844Z
Link: CVE-2024-56669
Vulnrichment
No data.
NVD
Status : Analyzed
Published: 2024-12-27T15:15:26.797
Modified: 2025-01-06T18:19:13.567
Link: CVE-2024-56669
Redhat