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CVE-2021-47140— iommu/amd: Clear DMA ops when switching domain

EPSS 0.05% · P14
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I. Basic Information for CVE-2021-47140

Vulnerability Information
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Vulnerability Title
iommu/amd: Clear DMA ops when switching domain
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Clear DMA ops when switching domain Since commit 08a27c1c3ecf ("iommu: Add support to change default domain of an iommu group") a user can switch a device between IOMMU and direct DMA through sysfs. This doesn't work for AMD IOMMU at the moment because dev->dma_ops is not cleared when switching from a DMA to an identity IOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an identity domain, causing an oops: # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/unbind # echo identity > /sys/bus/pci/devices/0000:00:05.0/iommu_group/type # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/bind ... BUG: kernel NULL pointer dereference, address: 0000000000000028 ... Call Trace: iommu_dma_alloc e1000e_setup_tx_resources e1000e_open Since iommu_change_dev_def_domain() calls probe_finalize() again, clear the dma_ops there like Vt-d does.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于切换域时不会清除DMA操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 08a27c1c3ecf5e1da193ce5f8fc97c3be16e75f0 ~ f3f2cf46291a693eab21adb94171b0128c2a9ec1 -
LinuxLinux 5.11 -

II. Public POCs for CVE-2021-47140

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III. Intelligence Information for CVE-2021-47140

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Same Patch Batch · Linux · 2024-03-25 · 40 CVEs total

CVE-2021-47171net: usb: fix memory leak in smsc75xx_bind
CVE-2021-47162tipc: skb_linearize the head skb when reassembling msgs
CVE-2021-47163tipc: wait and exit until all work queues are done
CVE-2021-47164net/mlx5e: Fix null deref accessing lag dev
CVE-2021-47165drm/meson: fix shutdown crash when component not probed
CVE-2021-47166NFS: Don't corrupt the value of pg_bytes_written in nfs_do_recoalesce()
CVE-2021-47167NFS: Fix an Oopsable condition in __nfs_pageio_add_request()
CVE-2021-47168NFS: fix an incorrect limit in filelayout_decode_layout()
CVE-2021-47169serial: rp2: use 'request_firmware' instead of 'request_firmware_nowait'
CVE-2021-47170USB: usbfs: Don't WARN about excessively large memory allocations
CVE-2021-47161spi: spi-fsl-dspi: Fix a resource leak in an error handling path
CVE-2021-47172iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers
CVE-2021-47173misc/uss720: fix memory leak in uss720_probe
CVE-2021-47174netfilter: nft_set_pipapo_avx2: Add irq_fpu_usable() check, fallback to non-AVX2 version
CVE-2021-47175net/sched: fq_pie: fix OOB access in the traffic path
CVE-2021-47176s390/dasd: add missing discipline function
CVE-2021-47177iommu/vt-d: Fix sysfs leak in alloc_iommu()
CVE-2021-47178scsi: target: core: Avoid smp_processor_id() in preemptible code
CVE-2021-47179NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()
CVE-2021-47180NFC: nci: fix memory leak in nci_allocate_device

Showing top 20 of 40 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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