Ubuntu update for linux

Published: 2021-05-11

Risk	Low
Patch available	YES
Number of vulnerabilities	7
CVE-ID	CVE-2020-25639 CVE-2021-28038 CVE-2021-28375 CVE-2021-28660 CVE-2021-29265 CVE-2021-29650 CVE-2021-30002
CWE-ID	CWE-476 CWE-770 CWE-862 CWE-787 CWE-362 CWE-119 CWE-401
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-gkeop (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 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem-osp1 (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-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-gkeop-5.4 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke-5.4 (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-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-gcp (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-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-73-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-73-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-73-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1048-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1047-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1045-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1043-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1043-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1039-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1015-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1044-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-snapdragon-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Null pointer dereference

EUVDB-ID: #VU92764

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25639

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in versions prior to 5.12-rc1 in the way the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw allows a local user to crash the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-gkeop (Ubuntu package): before 5.4.0.1015.18

linux-image-virtual (Ubuntu package): before 5.4.0.73.76

linux-image-oracle (Ubuntu package): before 5.4.0.1044.47~18.04.26

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.73.76

linux-image-oem (Ubuntu package): before 5.4.0.73.76

linux-image-lowlatency (Ubuntu package): before 5.4.0.73.76

linux-image-kvm (Ubuntu package): before 5.4.0.1039.37

linux-image-gkeop-5.4 (Ubuntu package): before 5.4.0.1015.16~18.04.16

linux-image-gke-5.4 (Ubuntu package): before 5.4.0.1043.45~18.04.9

linux-image-gke (Ubuntu package): before 5.4.0.1043.52

linux-image-generic-lpae (Ubuntu package): before 5.4.0.73.76

linux-image-generic (Ubuntu package): before 5.4.0.73.76

linux-image-gcp (Ubuntu package): before 5.4.0.1043.30

linux-image-azure (Ubuntu package): before 5.4.0.1047.26

linux-image-aws (Ubuntu package): before 5.4.0.1048.30

linux-image-5.4.0-73-lowlatency (Ubuntu package): before 5.4.0-73.82~18.04.1

linux-image-5.4.0-73-generic-lpae (Ubuntu package): before 5.4.0-73.82~18.04.1

linux-image-5.4.0-73-generic (Ubuntu package): before 5.4.0-73.82~18.04.1

linux-image-5.4.0-1048-aws (Ubuntu package): before 5.4.0-1048.50~18.04.1

linux-image-5.4.0-1047-azure (Ubuntu package): before 5.4.0-1047.49~18.04.1

linux-image-5.4.0-1045-oracle (Ubuntu package): before 5.4.0-1045.49+1

linux-image-5.4.0-1043-gke (Ubuntu package): before 5.4.0-1043.45~18.04.1

linux-image-5.4.0-1043-gcp (Ubuntu package): before 5.4.0-1043.46~18.04.1

linux-image-5.4.0-1039-kvm (Ubuntu package): before 5.4.0-1039.40

linux-image-5.4.0-1015-gkeop (Ubuntu package): before 5.4.0-1015.16~18.04.1

linux-image-5.4.0-1044-oracle (Ubuntu package): before 5.4.0-1044.47~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.73.82~18.04.66

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.73.82~18.04.66

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.73.82~18.04.66

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.73.82~18.04.66

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.73.82~18.04.66

CPE2.3

External links

https://ubuntu.com/security/notices/USN-4945-1

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) Allocation of resources without limits or throttling

EUVDB-ID: #VU92417

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-28038

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

Exploit availability: No

Description

The vulnerability allows a local user to a crash the entire system.

The vulnerability exists due to allocation of resources without limits or throttling error within the xenvif_tx_action() function in drivers/net/xen-netback/netback.c. A local user can a crash the entire system.