All Vulnerability Reports

USN-5018-1: Linux kernel vulnerabilities

Severity

High

Vendor

VMware Tanzu

Versions Affected

• Canonical Ubuntu 16.04

Description

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)

CVEs contained in this USN include: CVE-2021-31829, CVE-2021-33200, CVE-2020-26558, CVE-2021-23134, CVE-2020-24586, CVE-2020-24587, CVE-2021-32399, CVE-2021-33034, CVE-2020-26147, CVE-2020-26139, CVE-2021-33909, CVE-2021-0129

Affected VMware Products and Versions

Severity is high unless otherwise noted.

• Isolation Segment
  • 2.7.x versions with Xenial Stemcells prior to 456.169
  • 2.8.x versions with Xenial Stemcells prior to 621.135
  • 2.9.x versions with Xenial Stemcells prior to 621.135
  • 2.10.x versions with Xenial Stemcells prior to 621.135
  • 2.11.x versions with Xenial Stemcells prior to 621.135

• Operations Manager
  • 2.9.x versions prior to 2.9.21
  • 2.10.x versions prior to 2.10.16

• VMware Tanzu Application Service for VMs
  • 2.7.x versions with Xenial Stemcells prior to 456.169
  • 2.8.x versions with Xenial Stemcells prior to 621.135
  • 2.9.x versions with Xenial Stemcells prior to 621.135
  • 2.10.x versions with Xenial Stemcells prior to 621.135
  • 2.11.x versions with Xenial Stemcells prior to 621.135
  • 2.12.x versions with Xenial Stemcells prior to 621.135

Mitigation

Users of affected products are strongly encouraged to follow the mitigation below. On the Tanzu 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:

• Isolation Segment
  • 2.7.x: Upgrade Xenial Stemcells to 456.169 or greater
  • 2.8.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.9.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.10.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.11.x: Upgrade Xenial Stemcells to 621.135 or greater

• Operations Manager
  • 2.9.21
  • 2.10.16

• VMware Tanzu Application Service for VMs
  • 2.7.x: Upgrade Xenial Stemcells to 456.169 or greater
  • 2.8.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.9.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.10.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.11.x: Upgrade Xenial Stemcells to 621.135 or greater
  • 2.12.x: Upgrade Xenial Stemcells to 621.135 or greater

References

• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-31829
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33200
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26558
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23134
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24586
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24587
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-32399
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33034
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26147
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26139
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33909
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-0129
• https://ubuntu.com/security/notices/USN-5018-1

History

2021-12-09: Initial vulnerability report published.