medium 6.7

CVE-2023-28772 json

An issue was discovered in the Linux kernel before 5.13.3.

published 2023-03-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32407

cvss: 6.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

An issue was discovered in the Linux kernel before 5.13.3. lib/seq_buf.c has a seq_buf_putmem_hex buffer overflow.

Patch / fix

fixed in 1 distros 5 links 1

linux linux_kernel 4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.133, 5.10.51, 5.12.18, 5.13.3

debian ubuntu red hat suse almalinux

linux Debian 14, Debian 13, Debian 12 5.14.6-1

debian advisories DEBIAN-CVE-2023-28772

linux Ubuntu 18.04 LTS 4.15.0-156.163
linux Ubuntu 20.04 LTS 5.4.0-84.94
linux-aws Ubuntu 18.04 LTS 4.15.0-1111.118
linux-aws Ubuntu 20.04 LTS 5.4.0-1056.59
linux-gcp Ubuntu 20.04 LTS 5.4.0-1052.56
linux-gke Ubuntu 20.04 LTS 5.4.0-1052.55
linux-kvm Ubuntu 18.04 LTS 4.15.0-1099.101
linux-kvm Ubuntu 20.04 LTS 5.4.0-1046.48

ubuntu advisories UBUNTU-CVE-2023-28772

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 8 4.18.0-513.5.1.el8_9
perf RHEL 8 4.18.0-513.5.1.el8_9
bpftool RHEL 8 4.18.0-513.5.1.el8_9
kernel-core RHEL 8 4.18.0-513.5.1.el8_9
kernel-tools RHEL 8 4.18.0-513.5.1.el8_9
python3-perf RHEL 8 4.18.0-513.5.1.el8_9
kernel-modules RHEL 8 4.18.0-513.5.1.el8_9

red hat advisories RHSA-2024:1404 RHSA-2024:0724 RHSA-2023:7077 RHSA-2023:6901

kernel-syms SLES 12 SP2-BCL 4.4.121-92.205.1
kernel-source SLES 12 SP2-BCL 4.4.121-92.205.1
kernel-default SLES 12 SP2-BCL 4.4.121-92.205.1
kernel-syms SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
kernel-source SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
kernel-default SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE Live Patching 15 SP2 +3 more 5.3.18-150200.24.148.1
kernel-preempt SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1
kernel-obs-build SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 5.3.18-150200.24.148.1

suse advisories SUSE-SU-2023:2805-1 SUSE-SU-2023:1800-1 SUSE-SU-2023:1811-1 SUSE-SU-2023:1892-1 SUSE-SU-2023:1848-1 SUSE-SU-2023:2232-1

kernel AlmaLinux 8 4.18.0-513.5.1.el8_9
perf AlmaLinux 8 4.18.0-513.5.1.el8_9
bpftool AlmaLinux 8 4.18.0-513.5.1.el8_9
kernel-core AlmaLinux 8 4.18.0-513.5.1.el8_9
kernel-tools AlmaLinux 8 4.18.0-513.5.1.el8_9
python3-perf AlmaLinux 8 4.18.0-513.5.1.el8_9
kernel-modules AlmaLinux 8 4.18.0-513.5.1.el8_9
kernel-zfcpdump AlmaLinux 8 4.18.0-513.5.1.el8_9

almalinux advisories ALSA-2023:7077

github.com/torvalds/linux@d3b1603 commit

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-2023-28772 updated 2026-11-07 cvss 6.7

kernel: lib/seq_buf.c has a seq_buf_putmem_hex buffer overflow

Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-513.5.1.el8_9, kernel-debuginfo-common-aarch64 4.18.0-513.5.1.el8_9, kernel-debuginfo-common-ppc64le 4.18.0-513.5.1.el8_9
fixed: vendor fix RHSA-2023:7077
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 Enterprise Linux BaseOS (v. 8) perf 4.18.0-513.5.1.el8_9, kernel 4.18.0-513.5.1.el8_9, bpftool 4.18.0-513.5.1.el8_9, kernel-core 4.18.0-513.5.1.el8_9, kernel-tools 4.18.0-513.5.1.el8_9, python3-perf 4.18.0-513.5.1.el8_9, +15 more
fixed: vendor fix RHSA-2023:7077
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 Real Time (v. 8) kernel-rt 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-core 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-modules 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-debug-core 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-debug-modules 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-modules-extra 4.18.0-513.5.1.rt7.307.el8_9, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-kvm 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-core 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-modules 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-debug-kvm 4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-debug-core 4.18.0-513.5.1.rt7.307.el8_9, +4 more
fixed: vendor fix RHSA-2023:6901
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

show 1 more

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, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 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: total
Assessed: 18 mo ago (2025-04-23)

Exploit prediction

0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.7	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	6.7	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	6.7	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input

Technology feeds

Linux kernel rss critical rss

References

github.com /torvalds/linux/commit/d3b16034a24a112bb83aeb669ac5b9b01f744bb7
patch, vendor-advisory
cdn.kernel.org /pub/linux/kernel/v5.x/ChangeLog-5.13.3
release-notes, vendor-advisory
lore.kernel.org /lkml/20210625122453.5e2fe304%40oasis.local.home/
lkml.kernel.org /r/20210626032156.47889-1-yun.zhou%40windriver.com
security.netapp.com /advisory/ntap-20230427-0005/
third-party-advisory

Sources

CVE List CVE-2023-28772
NVD CVE-2023-28772

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.

Summary