Ubuntu update for linux

Published: 2023-09-20

Risk	Medium
Patch available	YES
Number of vulnerabilities	9
CVE-ID	CVE-2022-40982 CVE-2023-3212 CVE-2023-32269 CVE-2023-3863 CVE-2023-40283 CVE-2023-4128 CVE-2023-4385 CVE-2023-4387 CVE-2023-4459
CWE-ID	CWE-1342 CWE-476 CWE-416 CWE-415
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system linux-image-4.4.0-1123-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-245-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-245-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1161-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1124-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-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-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-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 9 vulnerabilities.

1) Information exposure through microarchitectural state after transient execution

EUVDB-ID: #VU79262

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2022-40982

CWE-ID:

Exploit availability:

Description

The vulnerability allows a malicious guest to escalate privileges on the system.

The vulnerability exists due to the way data is shared between threads whereby the AVX GATHER instructions on Intel processors can forward the content of stale vector registers to dependent instructions. A malicious guest can infer data from different contexts on the same core and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1123-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-245-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-245-generic (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1161-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1124-kvm (Ubuntu package): before Ubuntu Pro

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

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

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

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-aws (Ubuntu package): before Ubuntu Pro (Infra-only)

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

Fixed software versions

CPE2.3

cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*

External links

http://ubuntu.com/security/notices/USN-6388-1

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) NULL pointer dereference

EUVDB-ID: #VU78009

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2023-3212

CWE-ID:

Exploit availability:

Description

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

The vulnerability exists due to a NULL pointer dereference error within the gfs2 file system in the Linux kernel. A local user can perform a denial of service (DoS) attack.