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Ubuntu: (Multiple Advisories) (CVE-2021-20194): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2021-20194): Linux kernel vulnerabilities

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
02/23/2021
Created
03/18/2021
Added
03/17/2021
Modified
03/22/2023

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)

  • ubuntu-upgrade-linux-image-5-10-0-1017-oem
  • ubuntu-upgrade-linux-image-5-4-0-1013-gkeop
  • ubuntu-upgrade-linux-image-5-4-0-1033-raspi
  • ubuntu-upgrade-linux-image-5-4-0-1037-kvm
  • ubuntu-upgrade-linux-image-5-4-0-1040-gke
  • ubuntu-upgrade-linux-image-5-4-0-1041-gcp
  • ubuntu-upgrade-linux-image-5-4-0-1042-oracle
  • ubuntu-upgrade-linux-image-5-4-0-1043-aws
  • ubuntu-upgrade-linux-image-5-4-0-1044-azure
  • ubuntu-upgrade-linux-image-5-4-0-71-generic
  • ubuntu-upgrade-linux-image-5-4-0-71-generic-lpae
  • ubuntu-upgrade-linux-image-5-4-0-71-lowlatency
  • ubuntu-upgrade-linux-image-5-6-0-1053-oem
  • ubuntu-upgrade-linux-image-5-8-0-1017-raspi
  • ubuntu-upgrade-linux-image-5-8-0-1017-raspi-nolpae
  • ubuntu-upgrade-linux-image-5-8-0-1020-kvm
  • ubuntu-upgrade-linux-image-5-8-0-1022-oracle
  • ubuntu-upgrade-linux-image-5-8-0-1024-azure
  • ubuntu-upgrade-linux-image-5-8-0-1024-gcp
  • ubuntu-upgrade-linux-image-5-8-0-1025-aws
  • ubuntu-upgrade-linux-image-5-8-0-45-generic
  • ubuntu-upgrade-linux-image-5-8-0-45-generic-64k
  • ubuntu-upgrade-linux-image-5-8-0-45-generic-lpae
  • ubuntu-upgrade-linux-image-5-8-0-45-lowlatency
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-64k
  • ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-gke-5-4
  • ubuntu-upgrade-linux-image-gkeop
  • ubuntu-upgrade-linux-image-gkeop-5-4
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
  • ubuntu-upgrade-linux-image-oem
  • ubuntu-upgrade-linux-image-oem-20-04
  • ubuntu-upgrade-linux-image-oem-20-04b
  • ubuntu-upgrade-linux-image-oem-osp1
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-raspi-hwe-18-04
  • ubuntu-upgrade-linux-image-raspi-nolpae
  • ubuntu-upgrade-linux-image-raspi2
  • ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual-hwe-20-04

References

  • https://attackerkb.com/topics/cve-2021-20194
  • CVE - 2021-20194
  • CVE-2021-20194
  • USN-4576-1
  • USN-4579-1
  • USN-4657-1
  • USN-4658-1
  • USN-4659-1
  • USN-4660-1
  • USN-4680-1
  • USN-4708-1
  • USN-4709-1
  • USN-4749-1
  • USN-4750-1
  • USN-4751-1
  • USN-4876-1
  • USN-4877-1
  • USN-4878-1
  • USN-4879-1
  • USN-4884-1
  • USN-4909-1
  • USN-4910-1
  • USN-4912-1
  • USN-4916-1
  • USN-4917-1
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