USN-5091-1

Advisory lineage Upstream: 12 Downstream: 0
Published: 28 Sept 2021, 02:30
Last modified:03 Jun 2026, 13:34

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

28 Sept 2021, 02:30
Published
Vulnerability first disclosed
03 Jun 2026, 13:34
Last Modified
Vulnerability information updated

Description

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. (CVE-2021-33624) It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679) Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576) It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160) Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199) It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204)

Affected Systems

  • ubuntu•linux

    < 5.4.0-88.99

  • ubuntu•linux-aws

    < 5.4.0-1057.60

  • ubuntu•linux-aws-5.4

    < 5.4.0-1057.60~18.04.1

  • ubuntu•linux-azure

    < 5.4.0-1059.62

  • ubuntu•linux-azure-5.4

    < 5.4.0-1059.62~18.04.1

  • ubuntu•linux-gcp

    < 5.4.0-1053.57

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1053.57~18.04.1

  • ubuntu•linux-gke

    < 5.4.0-1053.56

  • ubuntu•linux-gke-5.4

    < 5.4.0-1053.56~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1024.25

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1024.25~18.04.1

  • ubuntu•linux-hwe-5.4

    < 5.4.0-87.98~18.04.1

  • ubuntu•linux-kvm

    < 5.4.0-1047.49

  • ubuntu•linux-oracle

    < 5.4.0-1055.59

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1055.59~18.04.1

References (7)