CVE-2020-8835
Linux kernel bpf verifier vulnerability
- Published
- Apr 2, 2020
- Updated
- Sep 17, 2024
- Assigning CNA
- canonical
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HLow · next 30 days
- Percentile
- 93.1%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)
Sources
7Educational kernel exploit implementation for CVE-2020-8835 with Docker-based testing environment to demonstrate BPF vulnerability exploitation and defensive mitigation techniques.
Proof-of-concept exploit for CVE-2020-8835, a Linux kernel BPF verifier vulnerability enabling out-of-bounds memory access and privilege escalation. Includes compile instructions and sysctl-based mitigation steps.
- CVE-2020-8835-verificationResearch
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