Skip to main content
HIGH

CVE-2022-27666

CVSS v3

7.8

HIGH

EPSS Score

5.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for Linux kernel.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kernelAlmaLinux:9all versions · fixed in 5.14.0-70.17.1.el9_0and 27 other packages
  • kernelAlmaLinux:8all versions · fixed in 4.18.0-372.13.1.el8_6and 18 other packages
  • kernel-rtAlmaLinux:9all versions · fixed in 5.14.0-70.17.1.rt21.89.el9_0and 11 other packages
  • kernel-rtAlmaLinux:8all versions · fixed in 4.18.0-372.13.1.rt7.170.el8_6and 11 other packages

Vendor advisories

  • CVE-2022-27666 Red Hat Product Security949 products fixed

    kernel: buffer overflow in IPsec ESP transformation code

  • RHSA-2022:5678 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat Virtualization security, bug fix, and enhancement update [ovirt-4.5.1]

  • RHSA-2022:5476 Red Hat Product Security70 products fixed

    Red Hat Security Advisory: kpatch-patch security update

  • RHSA-2022:5249 Red Hat Product Security166 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2022:5316 Red Hat Product Security129 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2022:5344 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

10 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2022-03-11
Last Modified
2026-09-01

Frequently asked questions

What is 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.

Is CVE-2022-27666 actively exploited?

Active exploitation of CVE-2022-27666 has not been confirmed. Its EPSS score was 5.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-27666?

CVE-2022-27666 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Running Linux kernel? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database