CVE-2019-20934

Aliases:UBUNTU-CVE-2019-20934DEBIAN-CVE-2019-20934
Advisory lineage Upstream: 0 Downstream: 16
Modified
Published: 28 Nov 2020, 06:20
Last modified:05 Aug 2024, 03:00

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.4 MEDIUM
v2.0 (nvd)
EPSS Score
0.32% LOW
0% probability +0.28%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 Nov 2020, 06:20
Published
Vulnerability first disclosed
05 Aug 2024, 03:00
Last Modified
Vulnerability information updated

Description

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
  • v2.0•MEDIUM•Score: 5.4AV:L/AC:M/Au:N/C:P/I:N/A:C

EPSS Trends

Current EPSS score: 0.32%• Percentile: 25%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • debian•linux

    < 5.2.6-1 | < 5.2.6-1 | < 5.2.6-1 | < 5.2.6-1

  • ubuntu•linux

    all | < 4.4.0-165.193 | < 4.15.0-60.67

  • ubuntu•linux-aws

    < 4.4.0-1055.59 | < 4.4.0-1095.106 | < 4.15.0-1047.49

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-fips

    < 4.15.0-2018.18 | all

  • ubuntu•linux-aws-hwe

    < 4.15.0-1047.49~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1059.64~14.04.1 | < 4.15.0-1056.61 | all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2006.7 | all

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-fips

    < 4.4.0-1022.27 | all

  • ubuntu•linux-gcp

    < 4.15.0-1041.43 | all

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-4.15

    < 4.15.0-1041.43

  • ubuntu•linux-gke-5.0

    < 5.0.0-1020.20~18.04.1

  • ubuntu•linux-hwe

    < 4.15.0-60.67~16.04.1 | all

  • ubuntu•linux-hwe-edge

    all | < 5.3.0-19.20~18.04.2

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1059.66 | < 4.15.0-1043.43

  • ubuntu•linux-lts-xenial

    < 4.4.0-165.193~14.04.1

  • ubuntu•linux-oem

    < 4.15.0-1056.65

  • ubuntu•linux-oem-osp1

    < 5.0.0-1024.27

  • ubuntu•linux-oracle

    < 4.15.0-1022.25~16.04.1 | < 4.15.0-1022.25

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1123.132 | < 4.15.0-1044.47 | all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all

  • ubuntu•linux-snapdragon

    < 4.4.0-1127.135 | < 4.15.0-1062.69

  • linux•linux_kernel

    ≥ 4.19, < 4.19.64 | ≥ 5.2, ≤ 5.2.17 | 5.3:rc1

References (7)