Dashboard / CVE-2021-4159

CVE-2021-4159

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 29/100
Published: 2022-08-24 Modified: 2026-11-02 First seen: 2026-11-02 Status: active

Attack Surface

Low Complexity No Interaction Conf. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: High
UI: None
S: Unchanged
C: High
I: None
A: None

Description

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

Weakness Classification (1)

Affected Software (4)

VendorProductVersion
debian debian_linux 10.0
linux linux_kernel < 5.7
n/a kernel Fixed in v5.7-rc1
redhat enterprise_linux 8.0

References & Advisories (5)

Bug Bounty Relevance

29 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

4.4 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploitation Probability

0.25%
Raw Score 0.002480
Percentile 16.3%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00248
2026-11-12
0.00248
2026-11-10
0.00248
2026-11-09
0.00248
2026-11-08
0.00248
2026-11-07
0.00248
2026-11-06
0.00248
2026-11-05
0.00248
2026-11-04
0.00248
2026-11-03
0.00248
2026-11-02
0.00248

Intelligence Sources

mitre ref →
nvd ref →

External Links