SB2021040820 - Privilege escalation in Linux kernel BPF JIT compilers

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Main Vulnerability Database SB2021040820

SB2021040820 - Privilege escalation in Linux kernel BPF JIT compilers

Published: April 8, 2021 Updated: September 1, 2021

Security Bulletin ID SB2021040820
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Command Injection (CVE-ID: CVE-2021-29154)

CWE-ID: CWE-77 - Command injection

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect computation of branch displacements within the BPF JIT compilers in the Linux kernel in arch/x86/net/bpf_jit_comp.c and arch/x86/net/bpf_jit_comp32.c. A local user can inject and execute arbitrary commands with elevated privileges.


Remediation

Install update from vendor's website.

References