Ubuntu update for linux

Published: 2022-02-03

Risk	Medium
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2021-20322 CVE-2021-3640 CVE-2021-3752 CVE-2021-42739
CWE-ID	CWE-330 CWE-416 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-oem (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-16.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-16.04-edge (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-16.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-16.04 (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-oracle-lts-18.04 (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-gcp-lts-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-dell300x (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-lts-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-167-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-167-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-167-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1130-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1119-snapdragon (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1115-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1106-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1102-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1086-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1034-dell300x (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-hwe (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Use of insufficiently random values

EUVDB-ID: #VU63839

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20322

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error when processing received ICMP errors. A remote attacker can effectively bypass the source port UDP randomization to gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 18.04

linux-image-oem (Ubuntu package): before 5.4.0.96.100

linux-image-oracle (Ubuntu package): before 5.11.0.1027.30~20.04.19

linux-image-gcp (Ubuntu package): before 5.11.0.1028.32~20.04.26

linux-image-gke (Ubuntu package): before 5.4.0.1059.69

linux-image-azure (Ubuntu package): before 5.11.0.1027.30~20.04.25

linux-image-virtual-hwe-16.04 (Ubuntu package): before 4.15.0.187.173

linux-image-lowlatency-hwe-16.04-edge (Ubuntu package): before 4.15.0.187.173

linux-image-lowlatency-hwe-16.04 (Ubuntu package): before 4.15.0.187.173

linux-image-generic-hwe-16.04 (Ubuntu package): before 4.15.0.187.173

linux-image-virtual (Ubuntu package): before 4.15.0.167.156

linux-image-snapdragon (Ubuntu package): before 4.15.0.1119.122

linux-image-raspi2 (Ubuntu package): before 4.15.0.1102.100

linux-image-oracle-lts-18.04 (Ubuntu package): before 4.15.0.1086.96

linux-image-lowlatency (Ubuntu package): before 4.15.0.167.156

linux-image-kvm (Ubuntu package): before 4.15.0.1106.102

linux-image-generic-lpae (Ubuntu package): before 4.15.0.167.156

linux-image-generic (Ubuntu package): before 4.15.0.167.156

linux-image-gcp-lts-18.04 (Ubuntu package): before 4.15.0.1115.134

linux-image-dell300x (Ubuntu package): before 4.15.0.1034.36

linux-image-aws-lts-18.04 (Ubuntu package): before 4.15.0.1119.122

linux-image-4.15.0-167-lowlatency (Ubuntu package): before 4.15.0-167.175

linux-image-4.15.0-167-generic-lpae (Ubuntu package): before 4.15.0-167.175

linux-image-4.15.0-167-generic (Ubuntu package): before 4.15.0-167.175

linux-image-4.15.0-1130-azure (Ubuntu package): before 4.15.0-1130.143

linux-image-4.15.0-1119-snapdragon (Ubuntu package): before 4.15.0-1119.128

linux-image-4.15.0-1115-gcp (Ubuntu package): before 4.15.0-1115.129

linux-image-4.15.0-1106-kvm (Ubuntu package): before 4.15.0-1106.108

linux-image-4.15.0-1102-raspi2 (Ubuntu package): before 4.15.0-1102.109

linux-image-4.15.0-1086-oracle (Ubuntu package): before 4.15.0-1086.94

linux-image-4.15.0-1034-dell300x (Ubuntu package): before 4.15.0-1034.39

linux-image-aws-hwe (Ubuntu package): before 4.15.0.1099.92

CPE2.3

External links

https://ubuntu.com/security/notices/USN-5268-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use-after-free

EUVDB-ID: #VU63769

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3640

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in sco_sock_sendmsg() function of the Linux kernel HCI subsystem. A privileged local user can call ioct UFFDIO_REGISTER or other way trigger race condition to escalate privileges on the system.