Ubuntu update for linux

Published: 2021-01-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2019-0148 CVE-2020-25656 CVE-2020-25668 CVE-2020-27675 CVE-2020-28974 CVE-2020-4788
CWE-ID	CWE-400 CWE-416 CWE-476 CWE-125 CWE-200
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-virtual-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-smp-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-emb-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-smp-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-e500mc-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1083-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-powerpc64-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-powerpc64-emb (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-powerpc-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-powerpc-e500mc (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-198-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-snapdragon (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-emb (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-e500mc (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1147-snapdragon (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1143-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1119-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1085-kvm (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU22954

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-2019-0148

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to a resource leak in i40e driver. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.

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 4.4.0.198.173

linux-image-powerpc64-smp-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-powerpc64-emb-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-powerpc-smp-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-powerpc-e500mc-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-generic-lpae-lts-xenial (Ubuntu package): before 4.4.0.198.173

linux-image-4.4.0-1083-aws (Ubuntu package): before 4.4.0-1083.87

linux-image-aws (Ubuntu package): before 4.4.0.1083.80

linux-image-4.4.0-198-powerpc64-smp (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-4.4.0-198-powerpc64-emb (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-4.4.0-198-powerpc-smp (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-4.4.0-198-powerpc-e500mc (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-4.4.0-198-lowlatency (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-4.4.0-198-generic-lpae (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-4.4.0-198-generic (Ubuntu package): before 4.4.0-198.230~14.04.1

linux-image-virtual (Ubuntu package): before 4.4.0.198.204

linux-image-snapdragon (Ubuntu package): before 4.4.0.1147.139

linux-image-raspi2 (Ubuntu package): before 4.4.0.1143.143

linux-image-powerpc64-smp (Ubuntu package): before 4.4.0.198.204

linux-image-powerpc64-emb (Ubuntu package): before 4.4.0.198.204

linux-image-powerpc-smp (Ubuntu package): before 4.4.0.198.204

linux-image-powerpc-e500mc (Ubuntu package): before 4.4.0.198.204

linux-image-lowlatency (Ubuntu package): before 4.4.0.198.204

linux-image-kvm (Ubuntu package): before 4.4.0.1085.83

linux-image-generic-lpae (Ubuntu package): before 4.4.0.198.204

linux-image-generic (Ubuntu package): before 4.4.0.198.204

linux-image-4.4.0-1147-snapdragon (Ubuntu package): before 4.4.0-1147.157

linux-image-4.4.0-1143-raspi2 (Ubuntu package): before 4.4.0-1143.153

linux-image-4.4.0-1119-aws (Ubuntu package): before 4.4.0-1119.133

linux-image-4.4.0-1085-kvm (Ubuntu package): before 4.4.0-1085.94

CPE2.3

External links

https://ubuntu.com/security/notices/USN-4681-1

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.

2) Use-after-free

EUVDB-ID: #VU51547

Risk: Low

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

CVE-ID: CVE-2020-25656

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error in the way the console subsystem uses KDGKBSENT and KDSKBSENT IOCTLs. A local user can run a specially crafted program to trigger an out-of-bounds read and gain access to sensitive information.