CVE-2020-36694

Name: CVE-2020-36694
Creator: NVD / NIST
Published: 2023-05-21T23:15:08.96+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2020-36694 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. 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. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.7/10

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

EPSS Probability

0.44%

35.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.10

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10Release Notes
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12Release Notes
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5cMailing List, Patch
https://security.netapp.com/advisory/ntap-20230622-0005/
https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2Exploit, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10Release Notes
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12Release Notes
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5cMailing List, Patch
https://security.netapp.com/advisory/ntap-20230622-0005/
https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2Exploit, Third Party Advisory

Timeline

Published: May 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-36694?

How severe is CVE-2020-36694?

CVE-2020-36694 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36694?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-36694?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST