vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-4159

MEDIUM
4.4
CVSS Score
Published: August 24, 2022 at 03:10 PM UTC
Updated: June 17, 2026 at 04:19 AM UTC
4 products affected across 3 vendorsLinux KernelDebian LinuxEnterprise Linux

Using kernel by N/A?

Get instant alerts when new vulnerabilities affect kernel - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM4.4
Exploit prediction
EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.0
Linux Kernel· Linux
95%
v < 5.7
Affected range stops below 5.7, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
95%
8.0
Kernel· Red Hat
60%
All versions
Vendor states this is fixed in 5.7-rc1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2021-4159
x_refsource_MISCIssue Tracking
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2036024
x_refsource_MISCMailing ListPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://security-tracker.debian.org/tracker/CVE-2021-4159

CVSS

4.4MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-202NVD-CWE-Other

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card