CVE-2022-27666

A heap buffer overflow flaw was found in IPsec ESP transformation code in net/ipv4/esp4.c and net/ipv6/esp6.c. This flaw allows a local attacker with a normal user privilege to overwrite kernel heap objects and may cause a local privilege escalation threat.

What this means for your business

It affects Linux Kernel. It matters if your company, or a supplier that handles your data, runs it.
An attacker can use it only with access to the machine itself, with an ordinary user login, and without anyone at your company clicking anything.
FIRST's prediction model gives it a 6% chance of attack attempts being seen in the next 30 days, ranking above 92% of all known flaws.

What to do

1Check whether your company or your suppliers run Linux Kernel, and which version. The affected versions are listed further down this page.
2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS: 7.8 (v3.1)
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-787
Assigned by: cve@mitre.org

Dates

Published: 2022-03-23
Last modified: 2026-09-01
Sources: NVD

Affected products

Linux Linux Kernel4.11 - 4.14.274, 4.15 - 4.19.237, 4.20 - 5.4.188, 5.5 - 5.10.108, 5.11 - 5.15.29, 5.16 - 5.16.15, 5.17
Fedoraproject Fedora34, 35
Redhat Virtualization4.0
Redhat Enterprise Linux8.0
Netapp H300s Firmwareall versions
Netapp H300sall versions
Netapp H500s Firmwareall versions
Netapp H500sall versions
Netapp H700s Firmwareall versions
Netapp H700sall versions
Netapp H300e Firmwareall versions
Netapp H300eall versions

As listed in the NVD configuration data. Not a statement about your estate.