Ubuntu update for linux

1) Memory leak

EUVDB-ID: #VU55258

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25704

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

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the Linux kernel performance monitoring subsystem when using PERF_EVENT_IOC_SET_FILTER. A local user could use this flaw to starve the resources causing denial of service.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 18.04

linux-image-virtual-hwe-16.04 (Ubuntu package): before 4.15.0.133.131

linux-image-oem (Ubuntu package): before 4.15.0.133.131

linux-image-lowlatency-hwe-16.04 (Ubuntu package): before 4.15.0.133.131

linux-image-generic-lpae-hwe-16.04 (Ubuntu package): before 4.15.0.133.131

linux-image-generic-hwe-16.04 (Ubuntu package): before 4.15.0.133.131

linux-image-4.15.0-133-lowlatency (Ubuntu package): before 4.15.0-133.137~16.04.1

linux-image-4.15.0-133-generic-lpae (Ubuntu package): before 4.15.0-133.137~16.04.1

linux-image-4.15.0-133-generic (Ubuntu package): before 4.15.0-133.137~16.04.1

linux-image-virtual (Ubuntu package): before 4.15.0.135.122

linux-image-lowlatency (Ubuntu package): before 4.15.0.135.122

linux-image-generic-lpae (Ubuntu package): before 4.15.0.135.122

linux-image-generic (Ubuntu package): before 4.15.0.135.122

linux-image-4.15.0-135-lowlatency (Ubuntu package): before 4.15.0-135.139

linux-image-4.15.0-135-generic-lpae (Ubuntu package): before 4.15.0-135.139

linux-image-4.15.0-135-generic (Ubuntu package): before 4.15.0-135.139

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:linux-image-virtual-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-oem_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-lowlatency-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-lpae-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-generic-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-133-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-133-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-133-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-virtual_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-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-135-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-135-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-4.15.0-135-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4710-1

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.