Ubuntu update for linux

1) Memory leak

EUVDB-ID: #VU63836

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-4002

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

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

The vulnerability exists due memory leak in the Linux kernel's hugetlbfs memory usage. A local user can force the application to leak memory and gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-virtual-lts-xenial (Ubuntu package): before 4.4.01099.108

linux-image-server (Ubuntu package): before 4.4.01099.108

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.01099.108

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.01099.108

linux-image-generic-lpae (Ubuntu package): before 4.4.01099.108

linux-image-4.4.0-1098-aws (Ubuntu package): before 4.4.01099.108

linux-image-3.13.0-189-lowlatency (Ubuntu package): before 4.4.01099.108

linux-image-3.13.0-189-generic-lpae (Ubuntu package): before 4.4.01099.108

linux-image-3.13.0-189-generic (Ubuntu package): before 4.4.01099.108

linux-image-virtual (Ubuntu package): before 4.4.01099.108

linux-image-lowlatency (Ubuntu package): before 4.4.01099.108

linux-image-kvm (Ubuntu package): before 4.4.01099.108

linux-image-generic (Ubuntu package): before 4.4.01099.108

linux-image-aws (Ubuntu package): before 4.4.01099.108

linux-image-4.4.0-218-lowlatency (Ubuntu package): before 4.4.01099.108

linux-image-4.4.0-218-generic (Ubuntu package): before 4.4.01099.108

linux-image-4.4.0-1134-aws (Ubuntu package): before 4.4.01099.108

linux-image-4.4.0-1099-kvm (Ubuntu package): before 4.4.01099.108

CPE2.3

• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:linux-image-virtual-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-server:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-lowlatency-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-generic-lts-xenial_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-4.4.0-1098-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-3.13.0-189-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-3.13.0-189-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-3.13.0-189-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-virtual_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-4.4.0-218-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-4.4.0-218-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-4.4.0-1134-aws_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-4.4.0-1099-kvm_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-5211-1

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.