What is CVE-2020-36694?

CVE-2020-36694 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10, classified as a Use After Free flaw (CWE-416). CVE-2020-36694 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2020-36694?

CVE-2020-36694 has a CVSS score of 6.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2020-36694?

No patch is currently available for CVE-2020-36694. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2020-36694 actively exploited?

CVE-2020-36694 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2020-36694

Medium

An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.

Package Linux Kernel

Published 2023-05-21

Last modified 2025-01-31

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

6.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2020-36694 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2020-36694 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel.org
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10

Release Notes
Kernel.org
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12

Release Notes
Security
https://security.netapp.com/advisory/ntap-20230622-0005/
Syzkaller
https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2

Exploit Third Party Advisory
Kernel patch commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c
Patch

Details

CVE ID CVE-2020-36694

Severity Medium

CVSS score 6.7 / 10

CVSS version 3.1

Published 2023-05-21

Modified 2025-01-31

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2020-36694?

CVE-2020-36694 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10 , classified as an Use After Free flaw (CWE-416) . CVE-2020-36694 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2020-36694?

CVE-2020-36694 has a CVSS score of 6.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2020-36694?

No patch is currently available for CVE-2020-36694. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2020-36694 actively exploited?

No — CVE-2020-36694 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. View CWE-416 on MITRE CWE →