CVE-2020-25641

medium

Description

A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html

http://www.openwall.com/lists/oss-security/2020/10/06/9

https://bugzilla.redhat.com/show_bug.cgi?id=1881424

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e24969022cbd61ddc586f14824fc205661bb124

https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html

https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html

https://usn.ubuntu.com/4576-1/

https://www.kernel.org/doc/html/latest/block/biovecs.html

Details

Source: MITRE

Published: 2020-10-06

Updated: 2020-12-04

Type: CWE-835

Risk Information

CVSS v2

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM