Infinite loop in Linux kernel

1) Infinite loop

EUVDB-ID: #VU17252

Risk: Low

CVSSv3.1: 4 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-3819

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists in the function hid_debug_events_read() in drivers/hid/hid-debug.c file due to infinite loop when certain parameters passed from a userspace. A local attacker can execute a specially crafted program that submits malicious input to cause a system lock up and a denial of service.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 4.20.5

External links

http://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?id=13054abbaa4f1fd4e6f3b4b63439ec033b4c8035
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3819
http://github.com/torvalds/linux/commit/717adfdaf14704fd3ec7fa2c04520c0723247eac
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.175
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.157
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.100

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. However, proof of concept for this vulnerability is available.