USN-4526-1: Linux kernel vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Description

It was discovered that the AMD Cryptographic Coprocessor device driver in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-18808)

It was discovered that the Conexant 23885 TV card device driver for the Linux kernel did not properly deallocate memory in some error conditions. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-19054)

It was discovered that the ADIS16400 IIO IMU Driver for the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-19061)

It was discovered that the AMD Audio Coprocessor driver for the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker with the ability to load modules could use this to cause a denial of service (memory exhaustion). (CVE-2019-19067)

It was discovered that the Atheros HTC based wireless driver in the Linux kernel did not properly deallocate in certain error conditions. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-19073, CVE-2019-19074)

It was discovered that the F2FS file system in the Linux kernel did not properly perform bounds checking in some situations, leading to an out-of- bounds read. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2019-9445)

It was discovered that the VFIO PCI driver in the Linux kernel did not properly handle attempts to access disabled memory spaces. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-12888)

It was discovered that the cgroup v2 subsystem in the Linux kernel did not properly perform reference counting in some situations, leading to a NULL pointer dereference. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. (CVE-2020-14356)

It was discovered that the state of network RNG in the Linux kernel was potentially observable. A remote attacker could use this to expose sensitive information. (CVE-2020-16166)

CVEs contained in this USN include: CVE-2019-19061, CVE-2019-19067, CVE-2020-14356, CVE-2019-18808, CVE-2019-19054, CVE-2020-12888, CVE-2020-16166, CVE-2019-19073, CVE-2019-19074, CVE-2019-9445.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Xenial Stemcells
  • 250.x versions prior to 250.207
  • 315.x versions prior to 315.194
  • 456.x versions prior to 456.121
  • 621.x versions prior to 621.85
  • All other stemcells not listed.

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

• Xenial Stemcells
  • Upgrade 250.x versions to 250.207 or greater
  • Upgrade 315.x versions to 315.194 or greater
  • Upgrade 456.x versions to 456.121 or greater
  • Upgrade 621.x versions to 621.85 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.

History

2020-11-20: Initial vulnerability report published.