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OpenAdvisories
Medium USN-4680-1 9 CVEs

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities

Published Jan 6, 2021 · Updated Jun 3, 2026

Summary

It was discovered that debugfs in the Linux kernel as used by blktrace
contained a use-after-free in some situations. A privileged local attacker
could possibly use this to cause a denial of service (system crash).
(CVE-2019-19770)

It was discovered that a race condition existed in the binder IPC
implementation in the Linux kernel, 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-2020-0423)

Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered
that legacy pairing and secure-connections pairing authentication in the
Bluetooth protocol could allow an unauthenticated user to complete
authentication without pairing credentials via adjacent access. A
physically proximate attacker could use this to impersonate a previously
paired Bluetooth device. (CVE-2020-10135)

It was discovered that the console keyboard driver in the Linux kernel
contained a race condition. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-25656)

Minh Yuan discovered that the tty driver in the Linux kernel contained race
conditions when handling fonts. A local attacker could possibly use this to
expose sensitive information (kernel memory). (CVE-2020-25668)

Keyu Man discovered that the ICMP global rate limiter in the Linux kernel
could be used to assist in scanning open UDP ports. A remote attacker could
use to facilitate attacks on UDP based services that depend on source port
randomization. (CVE-2020-25705)

Jinoh Kang discovered that the Xen event channel infrastructure in the
Linux kernel contained a race condition. An attacker in guest could
possibly use this to cause a denial of service (dom0 crash).
(CVE-2020-27675)

Daniel Axtens discovered that PowerPC RTAS implementation in the Linux
kernel did not properly restrict memory accesses in some situations. A
privileged local attacker could use this to arbitrarily modify kernel
memory, potentially bypassing kernel lockdown restrictions.
(CVE-2020-27777)

Minh Yuan discovered that the framebuffer console driver in the Linux
kernel did not properly handle fonts in some conditions. A local attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information (kernel memory). (CVE-2020-28974)

Fixed packages 15

ReleasePackageFixed in
Ubuntu · 16.04 LTS 16.04:LTS linux-aws-hwe 4.15.0-1091.96~16.04.1
Ubuntu · 16.04 LTS 16.04:LTS linux-azure 4.15.0-1103.114~16.04.1
Ubuntu · 16.04 LTS 16.04:LTS linux-gcp 4.15.0-1091.104~16.04.1
Ubuntu · 16.04 LTS 16.04:LTS linux-hwe 4.15.0-129.132~16.04.1
Ubuntu · 16.04 LTS 16.04:LTS linux-oracle 4.15.0-1062.68~16.04.1
Ubuntu · 18.04 LTS 18.04:LTS linux 4.15.0-129.132
Ubuntu · 18.04 LTS 18.04:LTS linux-aws 4.15.0-1091.96
Ubuntu · 18.04 LTS 18.04:LTS linux-azure-4.15 4.15.0-1103.114
Ubuntu · 18.04 LTS 18.04:LTS linux-gcp-4.15 4.15.0-1091.104
Ubuntu · 18.04 LTS 18.04:LTS linux-gke-4.15 4.15.0-1077.82
Ubuntu · 18.04 LTS 18.04:LTS linux-kvm 4.15.0-1082.84
Ubuntu · 18.04 LTS 18.04:LTS linux-oracle 4.15.0-1062.68
Ubuntu · 18.04 LTS 18.04:LTS linux-raspi2 4.15.0-1077.82
Ubuntu · 18.04 LTS 18.04:LTS linux-snapdragon 4.15.0-1094.103
Ubuntu · Pro 14.04 LTS Pro:14.04:LTS linux-azure 4.15.0-1103.114~14.04.1

Vulnerabilities 9

References

  • report
    https://ubuntu.com/security/CVE-2019-19770
  • report
    https://ubuntu.com/security/CVE-2020-0423
  • report
    https://ubuntu.com/security/CVE-2020-10135
  • report
    https://ubuntu.com/security/CVE-2020-25656
  • report
    https://ubuntu.com/security/CVE-2020-25668
  • report
    https://ubuntu.com/security/CVE-2020-25705
  • report
    https://ubuntu.com/security/CVE-2020-27675
  • report
    https://ubuntu.com/security/CVE-2020-27777
  • report
    https://ubuntu.com/security/CVE-2020-28974