Ubuntu update for linux

Published: 2021-01-06

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-12912 CVE-2020-29534
CWE-ID	CWE-200 CWE-682
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-raspi (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-20.04 (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-raspi-nolpae (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-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-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-64k (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-5.8.0-34-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-34-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-34-generic-64k (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-34-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1017-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1016-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1015-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1014-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1014-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1011-raspi-nolpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.8.0-1011-raspi (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU48373

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-2020-12912

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The vulnerability exists due to excessive data output by the application in the Running Average Power Limit (RAPL) interface. A local user can gain unauthorized access to sensitive information on the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 20.10

linux-image-raspi (Ubuntu package): before 5.8.0.1011.14

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.8.0.34.37~20.04.20

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.8.0.34.37~20.04.20

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.8.0.34.37~20.04.20

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.8.0.34.37~20.04.20

linux-image-virtual (Ubuntu package): before 5.8.0.34.39

linux-image-raspi-nolpae (Ubuntu package): before 5.8.0.1011.14

linux-image-oracle (Ubuntu package): before 5.8.0.1014.14

linux-image-lowlatency (Ubuntu package): before 5.8.0.34.39

linux-image-kvm (Ubuntu package): before 5.8.0.1014.16

linux-image-gke (Ubuntu package): before 5.8.0.1015.15

linux-image-generic-lpae (Ubuntu package): before 5.8.0.34.39

linux-image-generic-64k (Ubuntu package): before 5.8.0.34.39

linux-image-generic (Ubuntu package): before 5.8.0.34.39

linux-image-gcp (Ubuntu package): before 5.8.0.1015.15

linux-image-azure (Ubuntu package): before 5.8.0.1016.16

linux-image-aws (Ubuntu package): before 5.8.0.1017.19

linux-image-5.8.0-34-lowlatency (Ubuntu package): before 5.8.0-34.37~20.04.2

linux-image-5.8.0-34-generic-lpae (Ubuntu package): before 5.8.0-34.37~20.04.2

linux-image-5.8.0-34-generic-64k (Ubuntu package): before 5.8.0-34.37

linux-image-5.8.0-34-generic (Ubuntu package): before 5.8.0-34.37~20.04.2

linux-image-5.8.0-1017-aws (Ubuntu package): before 5.8.0-1017.18

linux-image-5.8.0-1016-azure (Ubuntu package): before 5.8.0-1016.17

linux-image-5.8.0-1015-gcp (Ubuntu package): before 5.8.0-1015.15

linux-image-5.8.0-1014-oracle (Ubuntu package): before 5.8.0-1014.14

linux-image-5.8.0-1014-kvm (Ubuntu package): before 5.8.0-1014.15

linux-image-5.8.0-1011-raspi-nolpae (Ubuntu package): before 5.8.0-1011.14

linux-image-5.8.0-1011-raspi (Ubuntu package): before 5.8.0-1011.14

CPE2.3

External links

https://ubuntu.com/security/notices/USN-4678-1

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) Incorrect calculation

EUVDB-ID: #VU93783

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-29534

CWE-ID: CWE-682 - Incorrect Calculation

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to incorrect calculation within the __put_task_struct() and copy_process() functions in kernel/fork.c, within the __io_cqring_fill_event(), io_dismantle_req(), io_req_free_batch_finish(), io_req_free_batch(), io_close_prep(), io_req_drop_files(), io_req_set_file(), io_init_req(), io_submit_sqes(), io_sq_thread(), io_uring_alloc_task_context(), io_sq_offload_start(), io_wq_files_match(), io_uring_cancel_files(), io_cancel_task_cb(), SYSCALL_DEFINE6() and io_uring_get_fd() functions in fs/io_uring.c, within the exit_files() function in fs/file.c, within the bprm_execve() function in fs/exec.c. A local user can execute arbitrary code.