CVE-2021-34866

Description

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.14-rc3. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-14689.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• v3.0•HIGH•Score: 8.8CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
• v2.0•HIGH•Score: 7.2AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.13%• Percentile: 32%

Techniques & Countermeasures

• CWE-843•Access of Resource Using Incompatible Type ('Type Confusion')

  The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Affected Systems

• Unknown•Kernel

  5.14-rc3

• linux•linux_kernel

  ≥ 5.8, < 5.10.62 | ≥ 5.11, < 5.13.14

• netapp•h300e

  na

• netapp•h300s_firmware

  na

• netapp•h410c_firmware

  na

• netapp•h410s_firmware

  na

• netapp•h500e

  na

• netapp•h500s_firmware

  na

• netapp•h700e

  na

• netapp•h700s_firmware

  na

References (2)

• https://www.zerodayinitiative.com/advisories/ZDI-21-1148/
• https://security.netapp.com/advisory/ntap-20220217-0008/