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Vulnerability record · CVE-2018-25020 · published 8 December 2021

CVE-2018-25020: Linux kernel classic buffer overflow vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.51% · top 59.3% CWE-120 · Classic buffer overflow
7.8CVSS 3.1 base score, v2 4.6
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html Third Party AdvisoryVDB Entry
https://github.com/torvalds/linux/commit/050fad7c4534c13c8eb1d9c2ba66012e014773cb PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0005/ Third Party Advisory
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html Third Party AdvisoryVDB Entry
https://github.com/torvalds/linux/commit/050fad7c4534c13c8eb1d9c2ba66012e014773cb PatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20211229-0005/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-25020), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.