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Oracle Linux: (CVE-2021-20194) ELSA-2021-4356: kernel security, bug fix, and enhancement update

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Oracle Linux: (CVE-2021-20194) ELSA-2021-4356: kernel security, bug fix, and enhancement update

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
02/23/2021
Created
11/20/2021
Added
11/18/2021
Modified
11/18/2021

Description

There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.

Solution(s)

  • oracle-linux-upgrade-kernel

References

  • ELSA-2021-4356
  • CVE-2021-20194
  • USN-4879-1
  • USN-4884-1
  • USN-4909-1
  • USN-4912-1

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