Ubuntu update for linux

Published: 2023-10-23

Risk	Medium
Patch available	YES
Number of vulnerabilities	11
CVE-ID	CVE-2023-0597 CVE-2023-1206 CVE-2023-31083 CVE-2023-34319 CVE-2023-3772 CVE-2023-42752 CVE-2023-42753 CVE-2023-42755 CVE-2023-4622 CVE-2023-4623 CVE-2023-4921
CWE-ID	CWE-401 CWE-400 CWE-476 CWE-119 CWE-190 CWE-787 CWE-125 CWE-416
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-4.15.0-1125-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-219-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-219-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1171-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1162-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1156-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1146-kvm (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-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-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 (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-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-generic-hwe-16.04 (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-oem (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-oracle (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 11 vulnerabilities.

1) Memory leak

EUVDB-ID: #VU73765

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-2023-0597

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

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

The vulnerability exists due to memory leak within the Linux kernel cpu_entry_area mapping of X86 CPU data. A local user can gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 18.04

linux-image-4.15.0-1125-oracle (Ubuntu package): before Ubuntu Pro

linux-image-4.15.0-219-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.15.0-219-generic (Ubuntu package): before Ubuntu Pro

linux-image-4.15.0-1171-azure (Ubuntu package): before Ubuntu Pro

linux-image-4.15.0-1162-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.15.0-1156-gcp (Ubuntu package): before Ubuntu Pro

linux-image-4.15.0-1146-kvm (Ubuntu package): before Ubuntu Pro

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

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

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

linux-image-lowlatency (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-kvm (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-virtual (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-gcp (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-gke (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-azure (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-hwe-16.04 (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-hwe-16.04 (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-oem (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-virtual-hwe-16.04 (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-oracle (Ubuntu package): before Ubuntu Pro (Infra-only)

CPE2.3

External links

https://ubuntu.com/security/notices/USN-6440-1

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) Resource exhaustion

EUVDB-ID: #VU77953

Risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2023-1206

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to a hash collision flaw in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when an attacker makes a new kind of SYN flood attack. A remote attacker can increase the CPU usage of the server that accepts IPV6 connections up to 95%.