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OpenAdvisories
High USN-5018-1 12 CVEs

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

Published Jul 20, 2021 · Updated Jun 29, 2026

Ecosystem: Ubuntu

Summary

It was discovered that the virtual file system implementation in the Linux
kernel contained an unsigned to signed integer conversion error. A local
attacker could use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2021-33909)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly enforce limits for pointer operations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-33200)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did
not properly clear received fragments from memory in some situations. A
physically proximate attacker could possibly use this issue to inject
packets or expose sensitive information. (CVE-2020-24586)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation
incorrectly handled encrypted fragments. A physically proximate attacker
could possibly use this issue to decrypt fragments. (CVE-2020-24587)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation
incorrectly handled EAPOL frames from unauthenticated senders. A physically
proximate attacker could inject malicious packets to cause a denial of
service (system crash). (CVE-2020-26139)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could
reassemble mixed encrypted and plaintext fragments. A physically proximate
attacker could possibly use this issue to inject packets or exfiltrate
selected fragments. (CVE-2020-26147)

It was discovered that the bluetooth subsystem in the Linux kernel did not
properly perform access control. An authenticated attacker could possibly
use this to expose sensitive information. (CVE-2020-26558, CVE-2021-0129)

Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the
nfc implementation in the Linux kernel. A privileged local attacker could
use this issue to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-23134)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly prevent speculative loads in certain situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2021-31829)

It was discovered that a race condition in the kernel Bluetooth subsystem
could lead to use-after-free of slab objects. An attacker could use this
issue to possibly execute arbitrary code. (CVE-2021-32399)

It was discovered that a use-after-free existed in the Bluetooth HCI driver
of the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-33034)

Fixed packages 14

ReleasePackageFixed in
Ubuntu · 18.04 LTS 18.04:LTS linux 4.15.0-151.157
Ubuntu · 18.04 LTS 18.04:LTS linux-aws 4.15.0-1109.116
Ubuntu · 18.04 LTS 18.04:LTS linux-azure-4.15 4.15.0-1121.134
Ubuntu · 18.04 LTS 18.04:LTS linux-gcp-4.15 4.15.0-1106.120
Ubuntu · 18.04 LTS 18.04:LTS linux-kvm 4.15.0-1097.99
Ubuntu · 18.04 LTS 18.04:LTS linux-oracle 4.15.0-1078.86
Ubuntu · 18.04 LTS 18.04:LTS linux-raspi2 4.15.0-1092.98
Ubuntu · 18.04 LTS 18.04:LTS linux-snapdragon 4.15.0-1109.118
Ubuntu · Pro 14.04 LTS Pro:14.04:LTS linux-azure 4.15.0-1121.134~14.04.1
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS linux-aws-hwe 4.15.0-1109.116~16.04.1
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS linux-azure 4.15.0-1121.134~16.04.1
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS linux-gcp 4.15.0-1106.120~16.04.1
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS linux-hwe 4.15.0-151.157~16.04.1
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS linux-oracle 4.15.0-1078.86~16.04.1

Vulnerabilities 12

References

  • report
    https://ubuntu.com/security/CVE-2020-24586
  • report
    https://ubuntu.com/security/CVE-2020-24587
  • report
    https://ubuntu.com/security/CVE-2020-26139
  • report
    https://ubuntu.com/security/CVE-2020-26147
  • report
    https://ubuntu.com/security/CVE-2020-26558
  • report
    https://ubuntu.com/security/CVE-2021-0129
  • report
    https://ubuntu.com/security/CVE-2021-23134
  • report
    https://ubuntu.com/security/CVE-2021-31829
  • report
    https://ubuntu.com/security/CVE-2021-32399
  • report
    https://ubuntu.com/security/CVE-2021-33034
  • report
    https://ubuntu.com/security/CVE-2021-33200
  • report
    https://ubuntu.com/security/CVE-2021-33909