Ubuntu update for linux-gke-5.0

1) Input validation error

EUVDB-ID: #VU28169

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-2020-12771

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to a deadlock if a coalescing operation fails in "btree_gc_coalesce" in "drivers/md/bcache/btree.c" file. A local user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected package linux-gke-5.0 to the latest version.

Vulnerable software versions

Ubuntu: 18.04

linux-image-oem-osp1 (Ubuntu package): before 5.0.0.1067.65

linux-image-gke-5.0 (Ubuntu package): before 5.0.0.1046.31

linux-image-5.0.0-1067-oem-osp1 (Ubuntu package): before 5.0.0-1067.72

linux-image-5.0.0-1046-gke (Ubuntu package): before 5.0.0-1046.47

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:linux-image-oem-osp1_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-gke-5.0_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.0.0-1067-oem-osp1_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:linux-image-5.0.0-1046-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4462-1

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.