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Oracle Linux: (CVE-2018-16882) ELSA-2019-4541: Unbreakable Enterprise kernel security update

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Oracle Linux: (CVE-2018-16882) ELSA-2019-4541: Unbreakable Enterprise kernel security update

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
01/03/2019
Created
07/23/2020
Added
07/21/2020
Modified
08/11/2023

Description

A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions before 4.14.91 and before 4.19.13 are vulnerable.

Solution(s)

  • oracle-linux-upgrade-kernel-uek
  • oracle-linux-upgrade-kernel-uek-debug
  • oracle-linux-upgrade-kernel-uek-debug-devel
  • oracle-linux-upgrade-kernel-uek-devel
  • oracle-linux-upgrade-kernel-uek-doc
  • oracle-linux-upgrade-kernel-uek-headers
  • oracle-linux-upgrade-kernel-uek-tools
  • oracle-linux-upgrade-kernel-uek-tools-libs
  • oracle-linux-upgrade-kernel-uek-tools-libs-devel
  • oracle-linux-upgrade-perf
  • oracle-linux-upgrade-python-perf

References

  • ELSA-2019-4541
  • USN-3871-1
  • USN-3871-2
  • USN-3871-3
  • USN-3871-4
  • USN-3871-5
  • USN-3872-1
  • USN-3878-1
  • USN-3878-2
  • USN-3878-3
  • CVE-2018-16882
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