Linux Kernel up to 5.4.6 net/packet/af_packet.c prb_calc_retire_blk_tmo Packet resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 5.4.6. This affects the function prb_calc_retire_blk_tmo of the file net/packet/af_packet.c. The manipulation as part of Packet results in resource consumption. This vulnerability was named CVE-2019-20812. The attack needs to be approached locally. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 5.4.6 (Operating System). Affected is the function prb_calc_retire_blk_tmo of the file net/packet/af_packet.c. The manipulation as part of a Packet leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was presented 06/03/2020. This vulnerability is traded as CVE-2019-20812 since 06/03/2020. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 222862 (Linux Distros Unpatched Vulnerability : CVE-2019-20812), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.7 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (222862). See VDB-155987 and VDB-155986 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 222862
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2019-20812

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.7

Timelineinfo

06/03/2020 🔍
06/03/2020 +0 days 🔍
06/03/2020 +0 days 🔍
03/05/2025 +1736 days 🔍

Sourcesinfo

Vendor: kernel.org

Status: Confirmed

CVE: CVE-2019-20812 (🔍)
GCVE (CVE): GCVE-0-2019-20812
GCVE (VulDB): GCVE-100-155988
See also: 🔍

Entryinfo

Created: 06/03/2020 14:00
Updated: 03/05/2025 07:51
Changes: 06/03/2020 14:00 (41), 06/03/2020 15:31 (18), 03/05/2025 07:51 (20)
Complete: 🔍
Cache ID: 216::103

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