Allocation of Resources Without Limits or Throttling Affecting qemu-kvm-block-iscsi package, versions <15:4.2.1-11.module+el8.4.0+20319+6eb4347c


Severity

Recommended
high

Based on Oracle Linux security rating

    Threat Intelligence

    EPSS
    0.05% (15th percentile)

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  • Snyk ID SNYK-ORACLE8-QEMUKVMBLOCKISCSI-2601894
  • published 10 Apr 2022
  • disclosed 26 May 2021

How to fix?

Upgrade Oracle:8 qemu-kvm-block-iscsi to version 15:4.2.1-11.module+el8.4.0+20319+6eb4347c or higher.
This issue was patched in ELSA-2021-9568.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-kvm-block-iscsi package and not the qemu-kvm-block-iscsi package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.

CVSS Scores

version 3.1
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NVD

5.5 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
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SUSE

3.8 low
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Red Hat

3.2 low