Ubuntu update for linux

Published: 2021-08-18

Risk	Low
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2021-34693 CVE-2021-3564 CVE-2021-3573
CWE-ID	CWE-908 CWE-415 CWE-416
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-raspi (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gcp-lts-20.04 (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-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oracle-lts-20.04 (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-5.4.0-81-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke-5.4 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1042-raspi (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-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-81-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem-osp1 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1056-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1053-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gkeop-5.4 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1051-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-azure-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1022-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1045-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem (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-virtual (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-81-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1055-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1051-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-raspi-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-snapdragon-hwe-18.04 (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-lowlatency-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-18.04 (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-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Use of uninitialized resource

EUVDB-ID: #VU55263

Risk: Low

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

CVE-ID: CVE-2021-34693

CWE-ID: CWE-908 - Use of Uninitialized Resource

Exploit availability: No

Description

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

The vulnerability exists due to net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-raspi (Ubuntu package): before 5.4.0.1042.77

linux-image-gkeop (Ubuntu package): before 5.4.0.1022.25

linux-image-gcp-lts-20.04 (Ubuntu package): before 5.4.0.1051.61

linux-image-lowlatency (Ubuntu package): before 5.4.0.81.85

linux-image-generic-lpae (Ubuntu package): before 5.4.0.81.85

linux-image-oracle-lts-20.04 (Ubuntu package): before 5.4.0.1053.53

linux-image-kvm (Ubuntu package): before 5.4.0.1045.44

linux-image-5.4.0-81-generic-lpae (Ubuntu package): before 5.4.0-81.91~18.04.1

linux-image-gke-5.4 (Ubuntu package): before 5.4.0.1051.54~18.04.16

linux-image-5.4.0-1042-raspi (Ubuntu package): before 5.4.0-1042.46~18.04.3

linux-image-gke (Ubuntu package): before 5.4.0.1051.61

linux-image-raspi2 (Ubuntu package): before 5.4.0.1042.77

linux-image-5.4.0-81-lowlatency (Ubuntu package): before 5.4.0-81.91~18.04.1

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.81.85

linux-image-aws-lts-20.04 (Ubuntu package): before 5.4.0.1055.58

linux-image-5.4.0-1056-azure (Ubuntu package): before 5.4.0-1056.58~18.04.1

linux-image-5.4.0-1053-oracle (Ubuntu package): before 5.4.0-1053.57~18.04.1

linux-image-gkeop-5.4 (Ubuntu package): before 5.4.0.1022.23~18.04.23

linux-image-5.4.0-1051-gke (Ubuntu package): before 5.4.0-1051.54~18.04.1

linux-image-azure-lts-20.04 (Ubuntu package): before 5.4.0.1056.54

linux-image-5.4.0-1022-gkeop (Ubuntu package): before 5.4.0-1022.23~18.04.1

linux-image-5.4.0-1045-kvm (Ubuntu package): before 5.4.0-1045.47

linux-image-oem (Ubuntu package): before 5.4.0.81.85

linux-image-generic (Ubuntu package): before 5.4.0.81.85

linux-image-virtual (Ubuntu package): before 5.4.0.81.85

linux-image-5.4.0-81-generic (Ubuntu package): before 5.4.0-81.91~18.04.1

linux-image-5.4.0-1055-aws (Ubuntu package): before 5.4.0-1055.58~18.04.1

linux-image-5.4.0-1051-gcp (Ubuntu package): before 5.4.0-1051.55~18.04.1

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1042.45

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.81.91~18.04.73

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.81.91~18.04.73

linux-image-oracle (Ubuntu package): before 5.4.0.1053.57~18.04.33

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.81.91~18.04.73

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.81.91~18.04.73

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.81.91~18.04.73

linux-image-gcp (Ubuntu package): before 5.4.0.1051.37

linux-image-azure (Ubuntu package): before 5.4.0.1056.36

linux-image-aws (Ubuntu package): before 5.4.0.1055.38

CPE2.3

External links

https://ubuntu.com/security/notices/USN-5045-1

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) Double Free

EUVDB-ID: #VU63660

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3564

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a local attacker to perform a denial of service attack.

The vulnerability exists due to bluetooth subsystem in the Linux kernel does not properly handle HCI device detach events. An attacker with physical access to the system can trigger double free error and perform a denial of service attack.