Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2020-36791

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net_sched: keep alloc_hash updated after hash allocation In commit 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")…

Published May 7, 2025CWE-125EPSS 0.20%

Overview

CVE-2020-36791 is a high-severity vulnerability. It was published on May 7, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net_sched: keep alloc_hash updated after hash allocation

In commit 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")

I moved cp->hash calculation before the first

tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched.

This difference could lead to another out of bound access.

cp->alloc_hash should always be the size allocated, we should

update it after this tcindex_alloc_perfect_hash().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.cdthoughts.ch/2021/03/16/syzbot-bug.htmlRefgit.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3Refgit.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2Refgit.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266Refgit.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9Refgit.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386Refgit.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bfRefgit.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454Refsyzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534

How CyberStrike helps

Frequently asked questions

What is CVE-2020-36791?

CVE-2020-36791 is a high-severity vulnerability. It was published on May 7, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2020-36791?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2020-36791?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-36791?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-36791 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2020

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999