Ubuntu update for linux

Published: 2022-09-21

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-33655 CVE-2022-36946
CWE-ID	CWE-787 CWE-20
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-oem (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-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-193-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1137-snapdragon (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1119-raspi2 (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-virtual (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-oracle (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-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-hwe-16.04 (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-azure-lts-18.04 (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-4.15.0-193-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-193-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1151-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1141-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1136-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1127-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1106-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1053-dell300x (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-gcp (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 2 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU65833

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-33655

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in FBIOPUT_VSCREENINFO IOCTL. A local user can trigger an out-of-bounds write error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 18.04

linux-image-oem (Ubuntu package): before 5.4.0.126.127

linux-image-snapdragon (Ubuntu package): before 4.15.0.1137.138

linux-image-raspi2 (Ubuntu package): before 4.15.0.1119.116

linux-image-generic-lpae (Ubuntu package): before 4.15.0.193.178

linux-image-4.15.0-193-generic-lpae (Ubuntu package): before 4.15.0-193.204

linux-image-4.15.0-1137-snapdragon (Ubuntu package): before 4.15.0-1137.147

linux-image-4.15.0-1119-raspi2 (Ubuntu package): before 4.15.0-1119.127

linux-image-virtual-hwe-16.04 (Ubuntu package): before 4.15.0.193.178

linux-image-virtual (Ubuntu package): before 4.15.0.193.178

linux-image-oracle-lts-18.04 (Ubuntu package): before 4.15.0.1106.113

linux-image-oracle (Ubuntu package): before 5.4.0.1083.91~18.04.60

linux-image-lowlatency-hwe-16.04 (Ubuntu package): before 4.15.0.193.178

linux-image-lowlatency (Ubuntu package): before 4.15.0.193.178

linux-image-kvm (Ubuntu package): before 4.15.0.1127.120

linux-image-generic-hwe-16.04 (Ubuntu package): before 4.15.0.193.178

linux-image-generic (Ubuntu package): before 4.15.0.193.178

linux-image-gcp-lts-18.04 (Ubuntu package): before 4.15.0.1136.152

linux-image-dell300x (Ubuntu package): before 4.15.0.1053.53

linux-image-azure-lts-18.04 (Ubuntu package): before 4.15.0.1151.121

linux-image-aws-lts-18.04 (Ubuntu package): before 4.15.0.1141.141

linux-image-4.15.0-193-lowlatency (Ubuntu package): before 4.15.0-193.204

linux-image-4.15.0-193-generic (Ubuntu package): before 4.15.0-193.204

linux-image-4.15.0-1151-azure (Ubuntu package): before 4.15.0-1151.166

linux-image-4.15.0-1141-aws (Ubuntu package): before 4.15.0-1141.152

linux-image-4.15.0-1136-gcp (Ubuntu package): before 4.15.0-1136.152

linux-image-4.15.0-1127-kvm (Ubuntu package): before 4.15.0-1127.132

linux-image-4.15.0-1106-oracle (Ubuntu package): before 4.15.0-1106.117

linux-image-4.15.0-1053-dell300x (Ubuntu package): before 4.15.0-1053.58

linux-image-gke (Ubuntu package): before 5.15.0.1015.17

linux-image-gcp (Ubuntu package): before 5.15.0.1017.23~20.04.1

linux-image-aws-hwe (Ubuntu package): before 4.15.01140.151~16.04.1

CPE2.3

External links

https://ubuntu.com/security/notices/USN-5621-1

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) Input validation error

EUVDB-ID: #VU66476

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2022-36946

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the nfqnl_mangle() function in net/netfilter/nfnetlink_queue.c in the Linux kernel when processing IPv6 packets. A remote attacker can send specially crafted packets to the system and perform a denial of service (DoS) attack.