CVE-2019-20812
MEDIUMLinux Kernel < 5.4.7 - Denial of Service via TPACKET_V3 Retire Block Timeout Calculation
Title source: llmDescription
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 (5)
Core 5
Core References
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html
Vendor Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuApr2021.html
Patch, Vendor Advisory x_refsource_misc
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b43d1f9f7067c6759b1051e8ecb84e82cef569fe
Release Notes, Vendor Advisory x_refsource_misc
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.7
Scores
CVSS v3
5.5
EPSS
0.0046
EPSS Percentile
36.5%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-400
Status
published
Products (1)
linux/linux_kernel
< 5.4.7
Published
Jun 03, 2020
Tracked Since
Feb 18, 2026