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CVE-2019-20812

Good to know:

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Date: June 2, 2020

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.

Language: C

Severity Score

Related Resources (10)

https://www.oracle.com/security-alerts/cpuApr2021.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b43d1f9f7067c6759b1051e8ecb84e82cef569fe
https://security-tracker.debian.org/tracker/CVE-2019-20812
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
https://nvd.nist.gov/vuln/detail/CVE-2019-20812
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20812
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.7
https://access.redhat.com/security/cve/CVE-2019-20812
https://www.mend.io/vulnerability-database/CVE-2019-20812

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Top Fix

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Upgrade Version

Upgrade to version linux-libc-headers - 5.8;linux-yocto - 4.8.24+gitAUTOINC+c84532b647_f6329fd287;linux-yocto - 4.10+gitAUTOINC+805ea440c7_b259a5d744

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): COMPLETE
Additional information:

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