USN-4749-1

Advisory lineage Upstream: 18 Downstream: 0
Published: 25 Feb 2021, 07:05
Last modified:03 Jun 2026, 13:33

Vulnerability Summary

Overall Risk (default)
minimal
0/100
CVSS Score
No data
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Feb 2021, 07:05
Published
Vulnerability first disclosed
03 Jun 2026, 13:33
Last Modified
Vulnerability information updated

Description

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2020-25669) It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash). (CVE-2020-27815) Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in the Linux kernel did not correctly handle setting line discipline in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-27830, CVE-2020-28941) It was discovered that the memory management subsystem in the Linux kernel did not properly handle copy-on-write operations in some situations. A local attacker could possibly use this to gain unintended write access to read-only memory pages. (CVE-2020-29374) Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event processing backend in the Linux kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2020-29568) Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the Xen paravirt block backend in the Linux kernel, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2020-29569) Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660) Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

Affected Systems

  • ubuntu•linux

    < 4.15.0-136.140

  • ubuntu•linux-aws

    < 4.15.0-1094.101

  • ubuntu•linux-aws-hwe

    < 4.15.0-1094.101~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1108.120~14.04.1 | < 4.15.0-1108.120~16.04.1

  • ubuntu•linux-azure-4.15

    < 4.15.0-1108.120

  • ubuntu•linux-dell300x

    < 4.15.0-1012.16

  • ubuntu•linux-gcp

    < 4.15.0-1093.106~16.04.1

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1093.106

  • ubuntu•linux-gke-4.15

    < 4.15.0-1079.84

  • ubuntu•linux-hwe

    < 4.15.0-136.140~16.04.1

  • ubuntu•linux-kvm

    < 4.15.0-1085.87

  • ubuntu•linux-oracle

    < 4.15.0-1065.73~16.04.1 | < 4.15.0-1065.73

  • ubuntu•linux-raspi2

    < 4.15.0-1079.84

  • ubuntu•linux-snapdragon

    < 4.15.0-1096.105

References (10)