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CVE-2018-25020

Status Candidate

Overview

The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c.

Related Files

Kernel Live Patch Security Notice LSN-0083-1
Posted Jan 6, 2022
Authored by Benjamin M. Romer

The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c. Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host’s physical memory. Other vulnerabilities have also been addressed.

tags | advisory, overflow, kernel, vulnerability
systems | linux
advisories | CVE-2018-25020, CVE-2021-22555, CVE-2021-33909, CVE-2021-3653, CVE-2021-4002
SHA-256 | ddd1e7fc677c2b02d3351058bf31466aa231865f93abfb9cdfa1d1ca55622f8d
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