Information disclosure in Linux kernel

Published: 2020-09-26

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-10766 CVE-2020-10767
CWE-ID	CWE-362 CWE-399
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Linux kernel Operating systems & Components / Operating system
Vendor	Linux Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Race condition

EUVDB-ID: #VU47074

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-10766

CWE-ID:

Exploit availability:

Description

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

A logic bug flaw was found in Linux kernel before 5.8-rc1 in the implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.0 - 5.7.7

Fixed software versions

CPE2.3

cpe:2.3:o:linux_foundation:linux_kernel:5.0:*:*:*:*:*:*:*

External links

http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10766
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbbe2ad02e9df26e372f38cc3e70dab9222c832e

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Resource management error

EUVDB-ID: #VU47075