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Oracle Linux: (CVE-2021-31440) ELSA-2021-4356: kernel security, bug fix, and enhancement update

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Oracle Linux: (CVE-2021-31440) ELSA-2021-4356: kernel security, bug fix, and enhancement update

Severity
7
CVSS
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
Published
05/21/2021
Created
11/20/2021
Added
11/18/2021
Modified
11/18/2021

Description

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661.

Solution(s)

  • oracle-linux-upgrade-kernel

References

  • ELSA-2021-4356
  • CVE-2021-31440
  • USN-4997-1
  • USN-4997-2
  • USN-4999-1
  • USN-5001-1

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