CVE-2020-12657

Aliases:UBUNTU-CVE-2020-12657DEBIAN-CVE-2020-12657
Advisory lineage Upstream: 0 Downstream: 23
Modified
Published: 05 May 2020, 06:01
Last modified:04 Aug 2024, 12:04

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.71% LOW
1% probability +0.67%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 May 2020, 06:01
Published
Vulnerability first disclosed
04 Aug 2024, 12:04
Last Modified
Vulnerability information updated

Description

An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.71%• Percentile: 52%

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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

    < 5.6.7-1 | < 5.6.7-1 | < 5.6.7-1 | < 5.6.7-1

  • ubuntu•linux

    < 4.15.0-101.102 | < 5.4.0-31.35

  • ubuntu•linux-aws

    < 4.15.0-1067.71 | < 5.4.0-1011.11

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    < 5.3.0-1019.21~18.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2018.18 | all

  • ubuntu•linux-aws-hwe

    < 4.15.0-1067.71~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1083.93~14.04.1 | < 4.15.0-1083.93~16.04.1 | all | < 5.4.0-1012.12

  • ubuntu•linux-azure-4.15

    < 4.15.0-1083.93

  • ubuntu•linux-azure-5.3

    < 5.3.0-1022.23~18.04.1

  • 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

    < 4.15.0-1029.34

  • ubuntu•linux-gcp

    < 4.15.0-1071.81~16.04.1 | all | < 5.4.0-1011.11

  • ubuntu•linux-gcp-5.3

    < 5.3.0-1020.22~18.04.1

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-4.15

    < 4.15.0-1059.62

  • ubuntu•linux-gke-5.0

    < 5.0.0-1037.38

  • ubuntu•linux-gke-5.3

    < 5.3.0-1020.22~18.04.1

  • ubuntu•linux-hwe

    < 4.15.0-101.102~16.04.1 | < 5.3.0-53.47~18.04.1

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.15.0-1060.61 | < 5.4.0-1011.11

  • ubuntu•linux-oem

    < 4.15.0-1081.91

  • ubuntu•linux-oem-5.6

    < 5.6.0-1010.10

  • ubuntu•linux-oem-osp1

    < 5.0.0-1052.57

  • ubuntu•linux-oracle

    < 4.15.0-1039.43~16.04.1 | < 4.15.0-1039.43 | < 5.4.0-1011.11

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    < 5.3.0-1018.20~18.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1011.11

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.15.0-1062.66 | all

  • ubuntu•linux-raspi2-5.3

    < 5.3.0-1026.28~18.04.1

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    < 5.4.0-26.30 | all

  • ubuntu•linux-snapdragon

    < 4.15.0-1079.86

  • linux•linux_kernel

    < 5.6.5

References (18)