CVE-2022-27666

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-23 · updated 2026-09-01
Weakness: CWE-787

Description

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.

Affected products

Debian Linux: 9.0, 10.0, 11.0
Fedoraproject Fedora: 34, 35
Linux kernel: from 4.11 before 4.14.274; from 4.15 before 4.19.237; from 4.20 before 5.4.188; from 5.5 before 5.10.108; from 5.11 before 5.15.29; from 5.16 before 5.16.15 — fixed in 4.14.274, 4.19.237, 5.10.108, 5.15.29, 5.16.15, 5.4.188
NetApp H300E Firmware: all versions
NetApp H300S Firmware: all versions
NetApp H410C Firmware: all versions
NetApp H410S Firmware: all versions
NetApp H500E Firmware: all versions
NetApp H500S Firmware: all versions
NetApp H700E Firmware: all versions
NetApp H700S Firmware: all versions
Red Hat Enterprise Linux: 8.0
RedHat Virtualization: 4.0

How to fix

Upgrade to a fixed version: Linux kernel 4.14.274, 4.19.237, 5.10.108, 5.15.29. Check the vendor advisory for mitigations.

References

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