PT-2019-5684 · Linux+4 · Linux Kernel+4

Jann Horn · Published 2019-01-29 · Updated 2021-07-22 · CVE-2019-20934

Positive Technologies (AI Summary)

CVSS v2.0

5.4

Medium

Base vector

AV:L/AC:M/Au:N/C:P/I:N/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.2.6

Description The issue is related to a use-after-free in the show numa stats() function of the Linux kernel's NUMA system, caused by the inappropriate freeing of NUMA fault statistics. This can potentially allow an attacker to cause a denial of service.

Recommendations For Linux kernel versions prior to 5.2.6, update to version 5.2.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the show numa stats() function to minimize the risk of exploitation.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2019-1139

ALT-PU-2019-1363

ALT-PU-2019-2401

ALT-PU-2019-2465

ALT-PU-2019-2811

ALT-PU-2019-2838

ALT-PU-2019-2853

ALT-PU-2020-1024

ALT-PU-2020-1714

BDU:2020-05553

CESA-2021_2725

CVE-2019-20934

OPENSUSE-SU-2021:0075-1

OPENSUSE-SU-2021_0075-1

RHSA-2021:2725

RHSA-2021:2726

RHSA-2021:3987

RHSA-2021_2725

RHSA-2021_2726

SUSE-SU-2020:3766-1

SUSE-SU-2020:3798-1

SUSE-SU-2021:0097-1

SUSE-SU-2021:0098-1

SUSE-SU-2021:0118-1

SUSE-SU-2021:0133-1

SUSE-SU-2021:0434-1

SUSE-SU-2021:0437-1

SUSE-SU-2021:0438-1

SUSE-SU-2021:0452-1

Affected Products

Alt Linux

Centos

Linux Kernel

Red Hat

Suse

References · 269

• https://osv.dev/vulnerability/openSUSE-SU-2021:0075-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:3766-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20934 · Security Note
• https://linux.oracle.com/errata/ELSA-2021-2725.html · Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.6 · Vendor Advisory
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1913 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0118-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0452-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-20934 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-9002.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-20934 · Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0438-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0097-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-05553 · Security Note