CVE-2019-20812: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: before 5.4.7 (fixed in 5.4.7)

Published 2020-06-03. Last modified 2026-06-17.