Ubuntu update for linux

1) Out-of-bounds read

EUVDB-ID: #VU86247

Risk: Low

CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-4204

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: Yes

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a boundary condition in Linux kernel eBPF. A local user trigger an out-of-bounds read error and read contents of memory on the system or crash the kernel.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 21.10

linux-image-raspi (Ubuntu package): before 5.11.0.1025.23

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1055.56

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.11.0.46.51~20.04.23

linux-image-generic-64k-hwe-20.04 (Ubuntu package): before 5.11.0.46.51~20.04.23

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.11.0.46.51~20.04.23

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.11.0.46.51~20.04.23

linux-image-5.10.0-1055-oem (Ubuntu package): before 5.10.0-1055.58

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.11.0.46.51~20.04.23

linux-image-5.11.0-46-generic-lpae (Ubuntu package): before 5.11.0-46.51~20.04.1

linux-image-5.11.0-1025-aws (Ubuntu package): before 5.11.0-1025.27~20.04.1

linux-image-5.11.0-46-lowlatency (Ubuntu package): before 5.11.0-46.51~20.04.1

linux-image-5.11.0-1026-gcp (Ubuntu package): before 5.11.0-1026.29~20.04.1

linux-image-5.11.0-1025-oracle (Ubuntu package): before 5.11.0-1025.27~20.04.1

linux-image-5.11.0-1022-kvm (Ubuntu package): before 5.11.0-1022.24

linux-image-5.11.0-46-generic (Ubuntu package): before 5.11.0-46.51~20.04.1

linux-image-5.11.0-1025-raspi (Ubuntu package): before 5.11.0-1025.27

linux-image-5.11.0-1025-azure (Ubuntu package): before 5.11.0-1025.27~20.04.1

linux-image-5.11.0-1025-raspi-nolpae (Ubuntu package): before 5.11.0-1025.27

linux-image-5.11.0-46-generic-64k (Ubuntu package): before 5.11.0-46.51~20.04.1

linux-image-lowlatency (Ubuntu package): before 5.11.0.46.46

linux-image-generic-lpae (Ubuntu package): before 5.11.0.46.46

linux-image-kvm (Ubuntu package): before 5.11.0.1022.23

linux-image-azure (Ubuntu package): before 5.11.0.1025.25

linux-image-5.13.0-1009-aws (Ubuntu package): before 5.13.0-1009.10

linux-image-oracle (Ubuntu package): before 5.11.0.1025.25

linux-image-5.13.0-25-lowlatency (Ubuntu package): before 5.13.0-25.26

linux-image-gcp (Ubuntu package): before 5.11.0.1026.25

linux-image-5.13.0-1013-raspi (Ubuntu package): before 5.13.0-1013.15

linux-image-gke (Ubuntu package): before 5.11.0.1026.25

linux-image-oem-20.04 (Ubuntu package): before 5.10.0.1055.56

linux-image-raspi-nolpae (Ubuntu package): before 5.11.0.1025.23

linux-image-5.13.0-1010-azure (Ubuntu package): before 5.13.0-1010.11

linux-image-5.13.0-1013-raspi-nolpae (Ubuntu package): before 5.13.0-1013.15

linux-image-5.13.0-1013-oracle (Ubuntu package): before 5.13.0-1013.16

linux-image-5.13.0-25-generic-lpae (Ubuntu package): before 5.13.0-25.26

linux-image-5.13.0-25-generic-64k (Ubuntu package): before 5.13.0-25.26

linux-image-5.13.0-1010-gcp (Ubuntu package): before 5.13.0-1010.12

linux-image-aws (Ubuntu package): before 5.11.0.1025.25

linux-image-generic (Ubuntu package): before 5.11.0.46.46

linux-image-generic-64k (Ubuntu package): before 5.11.0.46.46

linux-image-5.13.0-25-generic (Ubuntu package): before 5.13.0-25.26

linux-image-virtual (Ubuntu package): before 5.11.0.46.46

linux-image-5.13.0-1008-kvm (Ubuntu package): before 5.13.0-1008.8

CPE2.3

• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:21.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:21.10:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:linux-image-raspi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oem-20.04b_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-64k-hwe-20.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae-hwe-20.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.10.0-1055-oem_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-46-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1025-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-46-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1026-gcp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1025-oracle_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1022-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-46-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1025-raspi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1025-azure_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-1025-raspi-nolpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.11.0-46-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-azure_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1009-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oracle_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-25-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gcp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1013-raspi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oem-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-raspi-nolpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1010-azure_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1013-raspi-nolpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1013-oracle_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-25-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-25-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1010-gcp_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-25-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.13.0-1008-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-5219-1

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.