Ubuntu update for linux

Published: 2023-07-12

Risk	Low
Patch available	YES
Number of vulnerabilities	7
CVE-ID	CVE-2021-20321 CVE-2021-3753 CVE-2022-1184 CVE-2022-26373 CVE-2022-29901 CVE-2023-1990 CVE-2023-3111
CWE-ID	CWE-362 CWE-125 CWE-416 CWE-264 CWE-1037
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system linux-image-4.4.0-1120-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1158-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-242-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1121-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-242-lowlatency (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 7 vulnerabilities.

1) Race condition

EUVDB-ID: #VU59084

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20321

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition when accessing file object in the Linux kernel OverlayFS subsystem. A local user can rename files in specific way with OverlayFS and perform a denial of service (DoS) attack.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1120-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1158-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-242-generic (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1121-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-242-lowlatency (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)

CPE2.3

External links

http://ubuntu.com/security/notices/USN-6221-1

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) Out-of-bounds read

EUVDB-ID: #VU64210

Risk: Low

CVSSv3.1: 4.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3753

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel. A local user can trigger out-of-bounds read error and read contents of memory on the system.