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Fencer Intel
high 7.4

CVE-2022-20567 json

In pppol2tp_create of l2tp_ppp.c, there is a possible use after free due to a race condition.

published 3y ago modified 4mo ago also EUVD-2022-25827

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

In pppol2tp_create of l2tp_ppp.c, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-186777253References: Upstream kernel

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.15.11-1

debian advisories DEBIAN-CVE-2022-20567

  • linux Ubuntu Pro 16.04 LTS 4.4.0-252.286
  • linux-aws Ubuntu Pro 14.04 LTS 4.4.0-1129.135
  • linux-aws Ubuntu Pro 16.04 LTS 4.4.0-1167.182
  • linux-kvm Ubuntu Pro 16.04 LTS 4.4.0-1130.140
  • linux-fips Ubuntu Pro FIPS-updates 16.04 LTS 4.4.0-1099.106
  • linux-lts-xenial Ubuntu Pro 14.04 LTS 4.4.0-252.286~14.04.1

ubuntu advisories UBUNTU-CVE-2022-20567

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-default SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE Live Patching 15 SP1 +3 more 4.12.14-150100.197.142.1
  • kernel-vanilla openSUSE Leap 15.4 4.12.14-150100.197.142.1
  • kernel-kvmsmall openSUSE Leap 15.4 4.12.14-150100.197.142.1
  • kernel-zfcpdump SLES 15 SP1-LTSS, openSUSE Leap 15.4 4.12.14-150100.197.142.1
  • drbd SLE High Availability Extension 12 SP4 9.0.14+git.62f906cf-4.26.2
  • kernel-syms SLES 12 SP4-LTSS, SLES 12 SP4-ESPOS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.125.1
  • kernel-source SLES 12 SP4-LTSS, SLES 12 SP4-ESPOS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.125.1
  • kernel-default SLES 12 SP4-LTSS, SLES 12 SP4-ESPOS, SLE Live Patching 12 SP4 +3 more 4.12.14-95.125.1

suse advisories SUSE-SU-2023:1848-1SUSE-SU-2023:2232-1SUSE-SU-2023:1894-1SUSE-SU-2023:1803-1SUSE-SU-2023:1801-1

Is CVE-2022-20567 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-20567 updated cvss 6.4

kernel: race in pppol2tp_release

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Virtualization 4 redhat-virtualization-host-image-update
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a Android

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.