Multiple vulnerabilities in Linux kernel

Published: 2020-07-16 | Updated: 2023-12-28

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-15393 CVE-2020-15780
CWE-ID	CWE-401 CWE-285
Exploitation vector	Local
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software	Linux kernel Operating systems & Components / Operating system
Vendor	Linux Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Memory leak

EUVDB-ID: #VU31921

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-2020-15393

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to perform DoS attack on the target system.

The vulnerability exists due memory leak in "drivers/usb/misc/usbtest.c" file. A local user can force the application to leak memory and perform denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.7 - 5.7.6

CPE2.3

cpe:2.3:o:linux_foundation:linux_kernel:5.7.6:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00071.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=28ebeb8db77035e058a510ce9bd17c2b9a009dba
https://lkml.org/lkml/2020/6/2/968

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) Improper Authorization

EUVDB-ID: #VU31922

Risk: Low

CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2020-15780

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: Yes

Description

The vulnerability allows a local user to bypass authorization checks.

The vulnerability exists due to improper authorization in "in drivers/acpi/acpi_configfs.c". A local administrator can inject malicious ACPI tables via configfs to bypass lockdown and secure boot restrictions.