Skip to content
Fencer Vulns
medium 5.5

CVE-2023-28327 json

A NULL pointer dereference flaw was found in the UNIX protocol in net/unix/diag.c In unix_diag_get_exact in the Linux Kernel.

published 2023-04-19 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32033

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 8%
public exploits
0
none known

Summary

A NULL pointer dereference flaw was found in the UNIX protocol in net/unix/diag.c In unix_diag_get_exact in the Linux Kernel. The newly allocated skb does not have sk, leading to a NULL pointer. This flaw allows a local user to crash or potentially cause a denial of service.

Patch / fix

  • linux linux_kernel 6.0
  • linux Debian 14, Debian 13, Debian 12 6.1.4-1

debian advisories DEBIAN-CVE-2023-28327

  • 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 22.04 LTS 5.15.0-1028.33
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1045.50

ubuntu advisories UBUNTU-CVE-2023-28327

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 RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • perf RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • bpftool RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • kernel-core RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • kernel-tools RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • python3-perf RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • kernel-modules RHEL 9.0 EUS 5.14.0-70.75.1.el9_0
  • kernel-zfcpdump RHEL 9.0 EUS 5.14.0-70.75.1.el9_0

red hat advisories RHSA-2023:5604RHSA-2023:5603

  • 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 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, Enterprise Storage 7.1 5.3.18-150300.59.182.1

suse advisories SUSE-SU-2024:4364-1SUSE-SU-2024:4140-1SUSE-SU-2024:4131-1SUSE-SU-2024:4103-1SUSE-SU-2024:4082-1SUSE-SU-2024:4081-1

  • kernel CBL-Mariner 2.0 5.15.111.1-1

azure linux advisories AZL-26339

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-2023-28327 updated cvss 5.5

kernel: denial of service problem in net/unix/diag.c

  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.75.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.75.1.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.75.1.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.75.1.el9_0 Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.75.1.el9_0, kernel-devel-matched 5.14.0-70.75.1.el9_0, kernel-debug-devel-matched 5.14.0-70.75.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.75.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.75.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.75.1.el9_0, +2 more Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.75.1.el9_0, bpftool 5.14.0-70.75.1.el9_0, kernel-core 5.14.0-70.75.1.el9_0, kernel-tools 5.14.0-70.75.1.el9_0, python3-perf 5.14.0-70.75.1.el9_0, kernel-modules 5.14.0-70.75.1.el9_0, +14 more
    fixed: vendor fix RHSA-2023:5604
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-core 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-modules 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-debug-core 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-debug-modules 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-modules-extra 5.14.0-70.75.1.rt21.146.el9_0, +2 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-kvm 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-core 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-modules 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-debug-kvm 5.14.0-70.75.1.rt21.146.el9_0, kernel-rt-debug-core 5.14.0-70.75.1.rt21.146.el9_0, +4 more
    fixed: vendor fix RHSA-2023:5603
  • 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
    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
20 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% 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.