What is CVE-2020-36791?

CVE-2020-36791 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 4.4.214 onward and patched in 4.4.218, 4.9.218, 4.14.175 and others. CVE-2020-36791 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2020-36791?

CVE-2020-36791 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2020-36791?

Yes, CVE-2020-36791 has been patched. Fixed versions include 4.4.218, 4.9.218, 4.14.175 and others. If you are running Linux kernel 4.4.214 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2020-36791 actively exploited?

CVE-2020-36791 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2020-36791

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") 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().

Package Linux Kernel

Published 2025-05-07

Last modified 2025-11-10

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2020-36791 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.4.214, 4.9.214, 4.14.171, 4.19.103, 5.4.19, 5.5.3 and later are affected. Fixed in 4.4.218, 4.9.218, 4.14.175, 4.19.114, 5.4.29, 5.5.14 and their respective stable series.

Affected from

≥ 4.4.214 ≥ 4.9.214 ≥ 4.14.171 ≥ 4.19.103 ≥ 5.4.19 ≥ 5.5.3

Fixed in

✓ 4.4.218 4.4.x ✓ 4.9.218 4.9.x ✓ 4.14.175 4.14.x ✓ 4.19.114 4.19.x ✓ 5.4.29 5.4.x ✓ 5.5.14 5.5.x

References

9 total

Kernel Git
https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3

Patch
Kernel Git
https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2

Patch
Kernel Git
https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266

Patch
Kernel Git
https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9

Patch
Kernel Git
https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386

Patch

Showing 5 of 9 references View all on NVD

Details

CVE ID CVE-2020-36791

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2025-05-07

Modified 2025-11-10

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2020-36791?

CVE-2020-36791 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 4.4.214 onward and has been patched in 4.4.218, 4.9.218, 4.14.175 and others. CVE-2020-36791 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2020-36791?

CVE-2020-36791 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2020-36791?

Yes. CVE-2020-36791 has been patched. Fixed versions include 4.4.218, 4.9.218, 4.14.175 and others. If you are running Linux kernel 4.4.214 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2020-36791 actively exploited?

No. CVE-2020-36791 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.