CVE-2020-15436

Aliases:UBUNTU-CVE-2020-15436DEBIAN-CVE-2020-15436
Advisory lineage Upstream: 0 Downstream: 26
Modified
Published: 23 Nov 2020, 20:08
Last modified:04 Aug 2024, 13:15

Vulnerability Summary

Overall Risk (default)
medium
39/100
CVSS Score
7.2 HIGH
v2.0 (nvd)
EPSS Score
0.93% LOW
1% probability +0.78%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

23 Nov 2020, 20:08
Published
Vulnerability first disclosed
04 Aug 2024, 13:15
Last Modified
Vulnerability information updated

Description

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.2AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.93%• Percentile: 59%

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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

  • broadcom•brocade_fabric_operating_system

    na

  • debian•linux

    < 5.7.6-1 | < 5.7.6-1 | < 5.7.6-1 | < 5.7.6-1

  • ubuntu•linux

    all | < 4.4.0-187.217 | < 4.15.0-115.116 | < 5.4.0-45.49

  • ubuntu•linux-aws

    < 4.4.0-1076.80 | < 4.4.0-1112.124 | < 4.15.0-1080.84 | < 5.4.0-1022.22

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1022.22~18.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2025.25 | all | < 5.4.0-1069.73+fips2

  • ubuntu•linux-aws-hwe

    < 4.15.0-1080.84~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1093.103~14.04.1 | < 4.15.0-1093.103~16.04.1 | all | < 5.4.0-1023.23

  • ubuntu•linux-azure-4.15

    < 4.15.0-1093.103

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1023.23~18.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2007.8 | all | < 5.4.0-1073.76+fips1

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-fips

    < 4.4.0-1044.49 | all | < 4.15.0-1039.44

  • ubuntu•linux-gcp

    < 4.15.0-1081.92~16.04.1 | all | < 5.4.0-1022.22

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1081.92

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1022.22~18.04.1

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all | < 5.4.0-1067.71~20.04.1

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-4.15

    < 4.15.0-1067.70

  • ubuntu•linux-gke-5.0

    < 5.0.0-1046.47

  • ubuntu•linux-gke-5.3

    < 5.3.0-1033.35

  • ubuntu•linux-hwe

    < 4.15.0-115.116~16.04.1 | all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-45.49~18.04.2

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1078.85 | < 4.15.0-1072.73 | < 5.4.0-1021.21

  • ubuntu•linux-lts-xenial

    < 4.4.0-187.217~14.04.1

  • ubuntu•linux-oem

    < 4.15.0-1094.104

  • ubuntu•linux-oem-5.6

    < 5.6.0-1048.52

  • ubuntu•linux-oem-osp1

    < 5.0.0-1067.72

  • ubuntu•linux-oracle

    < 4.15.0-1051.55~16.04.1 | < 4.15.0-1051.55 | < 5.4.0-1022.22

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1022.22~18.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1016.17

  • ubuntu•linux-raspi-5.4

    < 5.4.0-1016.17~18.04.1

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1137.146 | < 4.15.0-1068.72 | all

  • ubuntu•linux-raspi2-5.3

    < 5.3.0-1032.34

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    < 5.4.0-31.35 | all

  • ubuntu•linux-snapdragon

    < 4.4.0-1141.149 | < 4.15.0-1084.92

  • linux•linux_kernel

    ≥ 2.6.38, < 4.4.229 | ≥ 4.5, < 4.9.229 | ≥ 4.10, < 4.14.186 | ≥ 4.15, < 4.19.130 | ≥ 4.20, < 5.4.49 | ≥ 5.5, < 5.7.6

Showing first 50 affected entries in server-rendered view.

References (7)