CVE-2018-20976

Aliases:UBUNTU-CVE-2018-20976DEBIAN-CVE-2018-20976
Advisory lineage Upstream: 0 Downstream: 25
Modified
Published: 19 Aug 2019, 01:52
Last modified:05 Aug 2024, 12:19

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.0 (nvd)
EPSS Score
0.63% LOW
1% probability +0.53%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

19 Aug 2019, 01:52
Published
Vulnerability first disclosed
05 Aug 2024, 12:19
Last Modified
Vulnerability information updated

Description

An issue was discovered in fs/xfs/xfs_super.c in the Linux kernel before 4.18. A use after free exists, related to xfs_fs_fill_super failure.

CVSS Metrics

  • v3.0•HIGH•Score: 7.8CVSS:3.0/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: 0.63%• Percentile: 49%

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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

    < 4.18.6-1 | < 4.18.6-1 | < 4.18.6-1 | < 4.18.6-1

  • ubuntu•linux

    all | < 4.4.0-165.193 | < 4.15.0-65.74

  • ubuntu•linux-aws

    < 4.4.0-1055.59 | < 4.4.0-1095.106 | < 4.15.0-1051.53

  • ubuntu•linux-aws-fips

    < 4.15.0-2018.18 | all

  • ubuntu•linux-aws-hwe

    < 4.15.0-1051.53~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1060.65~14.04.1 | < 4.15.0-1060.65 | < 4.18.0-1011.11~18.04.1

  • 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

    < 4.15.0-1046.49 | < 5.0.0-1020.20~18.04.1

  • ubuntu•linux-gcp-fips

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-4.15

    < 4.15.0-1045.48

  • ubuntu•linux-hwe

    < 4.15.0-65.74~16.04.1

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1059.66 | < 4.15.0-1047.47

  • ubuntu•linux-lts-xenial

    < 4.4.0-165.193~14.04.1

  • ubuntu•linux-oem

    < 4.15.0-1057.66

  • ubuntu•linux-oracle

    < 4.15.0-1026.29~16.04.1 | < 4.15.0-1026.29

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1123.132 | < 4.15.0-1048.52

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all | all

  • ubuntu•linux-snapdragon

    < 4.4.0-1127.135 | < 4.15.0-1065.72

  • linux•linux_kernel

    < 4.18

References (23)