CVE-2019-20812

medium

Description

An issue was discovered in the Linux kernel before 5.4.7. The prb_calc_retire_blk_tmo() function in net/packet/af_packet.c can result in a denial of service (CPU consumption and soft lockup) in a certain failure case involving TPACKET_V3, aka CID-b43d1f9f7067.

References

Advisories
More

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html

https://www.oracle.com/security-alerts/cpuApr2021.html

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b43d1f9f7067c6759b1051e8ecb84e82cef569fe

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.7

Details

Source: Mitre, NVD

Published: 2020-06-03

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

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

Severity: Medium

EPSS

EPSS: 0.0006