NULL Pointer Dereference Affecting kernel-rt-trace-devel package, versions *


Severity

low

    Threat Intelligence

    EPSS
    0.04% (9th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTTRACEDEVEL-6498770
  • published 26 Mar 2024
  • disclosed 25 Mar 2024

How to fix?

There is no fixed version for Centos:7 kernel-rt-trace-devel.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-trace-devel package and not the kernel-rt-trace-devel package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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.

CVSS Scores

version 3.1
Expand this section

Snyk

4.4 low
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    High
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
Expand this section

Red Hat

4.4 medium