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Fencer Vulns
medium 5.5

CVE-2023-2166 json

A null pointer dereference issue was found in can protocol in net/can/af_can.c in the Linux before Linux.

published 2023-04-19 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-33683

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

A null pointer dereference issue was found in can protocol in net/can/af_can.c in the Linux before Linux. ml_priv may not be initialized in the receive path of CAN frames. A local user could use this flaw to crash the system or potentially cause a denial of service.

Patch / fix

  • linux linux_kernel 6.1
  • linux Debian 14, Debian 13, Debian 12 6.1.4-1

debian advisories DEBIAN-CVE-2023-2166

  • linux Ubuntu 20.04 LTS 5.4.0-144.161
  • linux Ubuntu 22.04 LTS 5.15.0-67.74
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1097.105
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1031.35
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1101.110
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1030.37
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1095.102
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1028.33

ubuntu advisories UBUNTU-CVE-2023-2166

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

  • perf rhev hypervisor 4.4, RHEL 8.6 EUS 4.18.0-372.91.1.el8_6
  • kernel RHEL 9 5.14.0-362.18.1.el9_3
  • rv RHEL 9 5.14.0-362.18.1.el9_3
  • perf RHEL 9 5.14.0-362.18.1.el9_3
  • rtla RHEL 9 5.14.0-362.18.1.el9_3
  • bpftool RHEL 9 7.2.0-362.18.1.el9_3
  • libperf RHEL 9 5.14.0-362.18.1.el9_3
  • kernel-rt RHEL 9 5.14.0-362.18.1.el9_3

red hat advisories RHSA-2024:1404RHSA-2024:1382RHSA-2024:1367RHSA-2024:1306RHSA-2024:1250RHSA-2024:0724

  • kernel-64kb SLE Module for Basesystem 15 SP5 5.14.21-150500.55.88.1
  • kernel-syms SLE Module for Development Tools 15 SP5 5.14.21-150500.55.88.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5 5.14.21-150500.55.88.1
  • kernel-default SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +2 more 5.14.21-150500.55.88.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5 5.14.21-150500.55.88.1
  • kernel-obs-build SLE Module for Development Tools 15 SP5 5.14.21-150500.55.88.1
  • kernel-default-base SLE Module for Basesystem 15 SP5, SLE Micro 5.5 5.14.21-150500.55.88.1.150500.6.39.4
  • kernel-64kb SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS, SLE High Performance Computing 15 SP4-ESPOS 5.14.21-150400.24.141.1

suse advisories SUSE-SU-2024:4364-1SUSE-SU-2024:4131-1SUSE-SU-2024:4082-1SUSE-SU-2024:3985-1SUSE-SU-2024:3983-1SUSE-SU-2023:3377-1

  • kernel AlmaLinux 8 4.18.0-513.18.1.el8_9
  • perf AlmaLinux 8 4.18.0-513.18.1.el8_9
  • bpftool AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-core AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-tools AlmaLinux 8 4.18.0-513.18.1.el8_9
  • python3-perf AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-modules AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-zfcpdump AlmaLinux 8 4.18.0-513.18.1.el8_9

almalinux advisories ALSA-2024:0897

  • kernel CBL-Mariner 2.0 5.15.111.1-1

azure linux advisories AZL-26340

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-2166 updated cvss 5.5

kernel: NULL pointer dereference in can_rcv_filter

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-513.18.1.el8_9, kernel-debuginfo-common-aarch64 4.18.0-513.18.1.el8_9, kernel-debuginfo-common-ppc64le 4.18.0-513.18.1.el8_9
    fixed: vendor fix RHSA-2024:0897
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-s390x 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-x86_64 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-aarch64 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-ppc64le 5.14.0-362.18.1.el9_3
    fixed: vendor fix RHSA-2024:0461
  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.91.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.91.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.91.1.el8_6
    fixed: vendor fix RHSA-2024:0724
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.51.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.51.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.51.1.el8_8
    fixed: vendor fix RHSA-2024:1404
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.93.2.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.93.2.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.93.2.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.93.2.el9_0
    fixed: vendor fix RHSA-2024:1250
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.48.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.48.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.48.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.48.1.el9_2
    fixed: vendor fix RHSA-2024:0448
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-362.18.1.el9_3, perf 5.14.0-362.18.1.el9_3, rtla 5.14.0-362.18.1.el9_3, kernel-devel-matched 5.14.0-362.18.1.el9_3, kernel-64k-devel-matched 5.14.0-362.18.1.el9_3, kernel-debug-devel-matched 5.14.0-362.18.1.el9_3, +6 more
    fixed: vendor fix RHSA-2024:0461
show 23 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.93.2.el9_0, kernel-devel-matched 5.14.0-70.93.2.el9_0, kernel-debug-devel-matched 5.14.0-70.93.2.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.93.2.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.93.2.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.93.2.el9_0, +2 more
    fixed: vendor fix RHSA-2024:1250
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.48.1.el9_2, rtla 5.14.0-284.48.1.el9_2, kernel-devel-matched 5.14.0-284.48.1.el9_2, kernel-64k-devel-matched 5.14.0-284.48.1.el9_2, kernel-debug-devel-matched 5.14.0-284.48.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.48.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:0448
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-513.18.1.el8_9, kernel 4.18.0-513.18.1.el8_9, bpftool 4.18.0-513.18.1.el8_9, kernel-core 4.18.0-513.18.1.el8_9, kernel-tools 4.18.0-513.18.1.el8_9, python3-perf 4.18.0-513.18.1.el8_9, +15 more
    fixed: vendor fix RHSA-2024:0897
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.2.0-362.18.1.el9_3, kernel 5.14.0-362.18.1.el9_3, kernel-64k 5.14.0-362.18.1.el9_3, kernel-core 5.14.0-362.18.1.el9_3, kernel-tools 5.14.0-362.18.1.el9_3, python3-perf 5.14.0-362.18.1.el9_3, +28 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.135.1.el8_2, kernel 4.18.0-193.135.1.el8_2, bpftool 4.18.0-193.135.1.el8_2, kernel-core 4.18.0-193.135.1.el8_2, kernel-tools 4.18.0-193.135.1.el8_2, python3-perf 4.18.0-193.135.1.el8_2, +8 more
    fixed: vendor fix RHSA-2024:3528
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.125.1.el8_4, kernel 4.18.0-305.125.1.el8_4, bpftool 4.18.0-305.125.1.el8_4, kernel-core 4.18.0-305.125.1.el8_4, kernel-tools 4.18.0-305.125.1.el8_4, python3-perf 4.18.0-305.125.1.el8_4, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.125.1.el8_4, kernel 4.18.0-305.125.1.el8_4, bpftool 4.18.0-305.125.1.el8_4, kernel-core 4.18.0-305.125.1.el8_4, kernel-tools 4.18.0-305.125.1.el8_4, python3-perf 4.18.0-305.125.1.el8_4, +9 more
    fixed: vendor fix RHSA-2024:1367
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.91.1.el8_6, kernel 4.18.0-372.91.1.el8_6, bpftool 4.18.0-372.91.1.el8_6, kernel-core 4.18.0-372.91.1.el8_6, kernel-tools 4.18.0-372.91.1.el8_6, python3-perf 4.18.0-372.91.1.el8_6, +15 more
    fixed: vendor fix RHSA-2024:0724
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.51.1.el8_8, kernel 4.18.0-477.51.1.el8_8, bpftool 4.18.0-477.51.1.el8_8, kernel-core 4.18.0-477.51.1.el8_8, kernel-tools 4.18.0-477.51.1.el8_8, python3-perf 4.18.0-477.51.1.el8_8, +15 more
    fixed: vendor fix RHSA-2024:1404
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.93.2.el9_0, bpftool 5.14.0-70.93.2.el9_0, kernel-core 5.14.0-70.93.2.el9_0, kernel-tools 5.14.0-70.93.2.el9_0, python3-perf 5.14.0-70.93.2.el9_0, kernel-modules 5.14.0-70.93.2.el9_0, +14 more
    fixed: vendor fix RHSA-2024:1250
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.48.1.el9_2, kernel 5.14.0-284.48.1.el9_2, kernel-64k 5.14.0-284.48.1.el9_2, kernel-core 5.14.0-284.48.1.el9_2, kernel-tools 5.14.0-284.48.1.el9_2, python3-perf 5.14.0-284.48.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:0448
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.125.1.el8_4, kernel 4.18.0-305.125.1.el8_4, bpftool 4.18.0-305.125.1.el8_4, kernel-core 4.18.0-305.125.1.el8_4, kernel-tools 4.18.0-305.125.1.el8_4, python3-perf 4.18.0-305.125.1.el8_4, +8 more
    fixed: vendor fix RHSA-2024:1367
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-core 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-modules 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-core 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-modules 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-modules-extra 4.18.0-513.18.1.rt7.320.el8_9, +2 more
    fixed: vendor fix RHSA-2024:0881
  • Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-kvm 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-core 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-modules 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-debug-kvm 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-debug-core 4.18.0-305.125.1.rt7.201.el8_4, +4 more
    fixed: vendor fix RHSA-2024:1382
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-362.18.1.el9_3, kernel-rt-core 5.14.0-362.18.1.el9_3, kernel-rt-modules 5.14.0-362.18.1.el9_3, kernel-rt-debug-core 5.14.0-362.18.1.el9_3, kernel-rt-modules-core 5.14.0-362.18.1.el9_3, kernel-rt-debug-modules 5.14.0-362.18.1.el9_3, +4 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-core 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-modules 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-debug-core 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-debug-modules 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-modules-extra 5.14.0-70.93.1.rt21.165.el9_0, +2 more
    fixed: vendor fix RHSA-2024:1306
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-core 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-modules 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-debug-core 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-modules-core 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-debug-modules 5.14.0-284.48.1.rt14.333.el9_2, +4 more
    fixed: vendor fix RHSA-2024:0439
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-kvm 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-core 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-modules 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-kvm 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-core 4.18.0-513.18.1.rt7.320.el8_9, +4 more
    fixed: vendor fix RHSA-2024:0881
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-362.18.1.el9_3, kernel-rt-kvm 5.14.0-362.18.1.el9_3, kernel-rt-core 5.14.0-362.18.1.el9_3, kernel-rt-modules 5.14.0-362.18.1.el9_3, kernel-rt-debug-kvm 5.14.0-362.18.1.el9_3, kernel-rt-debug-core 5.14.0-362.18.1.el9_3, +6 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-kvm 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-core 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-modules 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-debug-kvm 5.14.0-70.93.1.rt21.165.el9_0, kernel-rt-debug-core 5.14.0-70.93.1.rt21.165.el9_0, +4 more
    fixed: vendor fix RHSA-2024:1306
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-kvm 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-core 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-modules 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-debug-kvm 5.14.0-284.48.1.rt14.333.el9_2, kernel-rt-debug-core 5.14.0-284.48.1.rt14.333.el9_2, +6 more
    fixed: vendor fix RHSA-2024:0439
  • Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-core 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-modules 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-debug-core 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-debug-modules 4.18.0-305.125.1.rt7.201.el8_4, kernel-rt-modules-extra 4.18.0-305.125.1.rt7.201.el8_4, +2 more
    fixed: vendor fix RHSA-2024:1382
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.91.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.91.1.el8_6
    fixed: vendor fix RHSA-2024:0724
  • 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 AppStream EUS (v.9.2) kernel-doc 5.14.0-284.48.1.el9_2
    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
partial
Assessed
21 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns 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.