Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 16.04

Description

USN-4255-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS.

It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. (CVE-2019-14615)

It was discovered that a race condition can lead to a use-after-free while destroying GEM contexts in the i915 driver for the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-7053)

CVEs contained in this USN include: CVE-2019-14615, CVE-2020-7053

Affected VMware Products and Versions

Severity is medium unless otherwise noted.

Vulnerable Cloud Foundry components individually listed here.

Impacted stemcells may be updated independently of upgrading Pivotal Application Service or PCF Isolation Segment.

• Operations Manager
  • 2.5.x versions prior to 2.5.29
  • 2.6.x versions prior to 2.6.22
  • 2.7.x versions prior to 2.7.12
  • 2.8.x versions prior to 2.8.4
• Pivotal Application Service (PAS)
  • 2.5.x versions prior to 2.5.21
  • 2.6.x versions prior to 2.6.16
  • 2.7.x versions prior to 2.7.10
  • 2.8.x versions prior to 2.8.4
• Pivotal Isolation Segment
  • 2.6.x versions prior to 2.6.15
  • 2.7.x versions prior to 2.7.10
  • 2.8.x versions prior to 2.8.4

Mitigation

Users of affected products are strongly encouraged to follow the mitigation below. The Cloud Foundry security team recommends upgrading the affected OSS components listed here if applicable. Upgrade Pivotal products that use earlier versions of CF components to new Pivotal releases using new versions linked above. On the Pivotal Network product page for each release, check the Depends On section and/or Release Notes for this information. Releases that have fixed this issue include:

• Operations Manager
  • 2.5.29
  • 2.6.22
  • 2.7.12
  • 2.8.4
• Pivotal Application Service (PAS)
  • 2.5.21
  • 2.6.16
  • 2.7.10
  • 2.8.4
• Pivotal Isolation Segment
  • 2.6.15
  • 2.7.10
  • 2.8.4

References

• https://people.canonical.com/~ubuntu-security/cve/CVE-2019-14615
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-7053
• https://usn.ubuntu.com/4255-2/
• https://cloudfoundry.org/blog/usn-4255-2

History

2020-01-28: Initial vulnerability report published.