Ubuntu update for linux

Published: 2021-02-25 | Updated: 2024-08-09

Risk	Low
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2020-27815 CVE-2020-29374 CVE-2020-29568 CVE-2020-29660 CVE-2020-29661
CWE-ID	CWE-125 CWE-362 CWE-119 CWE-667
Exploitation vector	Local
Public exploit	Public exploit code for vulnerability #6 is available.
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system linux-image-virtual-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-smp-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-emb-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-smp-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-e500mc-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-generic-lpae-lts-xenial (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1086-aws (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-4.4.0-203-powerpc64-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-203-powerpc64-emb (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-203-powerpc-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-203-powerpc-e500mc (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-203-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-203-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-203-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-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-powerpc64-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc64-emb (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-smp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-powerpc-e500mc (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-lpae (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-4.4.0-1150-snapdragon (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1146-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1122-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.4.0-1088-kvm (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Out-of-bounds read

EUVDB-ID: #VU49169

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27815

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in fs/jfs/jfs_dmap.c. A local user can trigger out-of-bounds read error and crash the kernel.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-virtual-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-powerpc64-smp-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-powerpc64-emb-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-powerpc-smp-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-powerpc-e500mc-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-generic-lpae-lts-xenial (Ubuntu package): before 4.4.0.203.177

linux-image-4.4.0-1086-aws (Ubuntu package): before 4.4.0-1086.90

linux-image-aws (Ubuntu package): before 4.4.0.1122.127

linux-image-4.4.0-203-powerpc64-smp (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-4.4.0-203-powerpc64-emb (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-4.4.0-203-powerpc-smp (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-4.4.0-203-powerpc-e500mc (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-4.4.0-203-lowlatency (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-4.4.0-203-generic-lpae (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-4.4.0-203-generic (Ubuntu package): before 4.4.0-203.235~14.04.1

linux-image-virtual (Ubuntu package): before 4.4.0.203.209

linux-image-snapdragon (Ubuntu package): before 4.4.0.1150.142

linux-image-raspi2 (Ubuntu package): before 4.4.0.1146.146

linux-image-powerpc64-smp (Ubuntu package): before 4.4.0.203.209

linux-image-powerpc64-emb (Ubuntu package): before 4.4.0.203.209

linux-image-powerpc-smp (Ubuntu package): before 4.4.0.203.209

linux-image-powerpc-e500mc (Ubuntu package): before 4.4.0.203.209

linux-image-lowlatency (Ubuntu package): before 4.4.0.203.209

linux-image-kvm (Ubuntu package): before 4.4.0.1088.86

linux-image-generic-lpae (Ubuntu package): before 4.4.0.203.209

linux-image-generic (Ubuntu package): before 4.4.0.203.209

linux-image-4.4.0-1150-snapdragon (Ubuntu package): before 4.4.0-1150.160

linux-image-4.4.0-1146-raspi2 (Ubuntu package): before 4.4.0-1146.156

linux-image-4.4.0-1122-aws (Ubuntu package): before 4.4.0-1122.136

linux-image-4.4.0-1088-kvm (Ubuntu package): before 4.4.0-1088.97

CPE2.3

External links

http://ubuntu.com/security/notices/USN-4748-1

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) Race condition

EUVDB-ID: #VU63812

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-29374

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 gain access to sensitive information.

The vulnerability exists due to a race condition in the mm/gup.c and mm/huge_memory.c in Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information.