medium 5.5

CVE-2023-0597 json

A flaw possibility of memory leak in the Linux kernel cpu_entry_area mapping of X86 CPU data to memory was found in the way user can guess…

published 2023-02-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-12635

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits: 0; none known

A flaw possibility of memory leak in the Linux kernel cpu_entry_area mapping of X86 CPU data to memory was found in the way user can guess location of exception stack(s) or other important data. A local user could use this flaw to get access to some important data with expected location in memory.

Patch / fix

distros 5 links 1

debian ubuntu red hat suse almalinux

linux Debian 14, Debian 13 6.3.7-1

debian advisories DEBIAN-CVE-2023-0597

linux Ubuntu 20.04 LTS 5.4.0-166.183
linux Ubuntu 22.04 LTS 5.15.0-79.86
linux-aws Ubuntu 20.04 LTS 5.4.0-1113.123
linux-aws Ubuntu 22.04 LTS 5.15.0-1042.47
linux-gcp Ubuntu 20.04 LTS 5.4.0-1117.126
linux-gcp Ubuntu 22.04 LTS 5.15.0-1039.47
linux-gke Ubuntu 22.04 LTS 5.15.0-1039.44
linux-ibm Ubuntu 20.04 LTS 5.4.0-1060.65

ubuntu advisories UBUNTU-CVE-2023-0597

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 4.18.0-372.95.1.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-2024:10773 RHSA-2024:10772 RHSA-2024:10262 RHSA-2024:1188 RHSA-2023:7077 RHSA-2023:6583

dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +3 more 5.14.21-150500.55.7.1
kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.7.1
kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.7.1

suse advisories SUSE-SU-2023:2871-1 SUSE-SU-2023:2809-1 SUSE-SU-2023:2232-1 SUSE-SU-2023:2646-1 SUSE-SU-2023:1710-1 SUSE-SU-2023:1609-1

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

git.kernel.org/linus/97e3d26b5e5f371b3ee223d94dd123e6c442ba80 patch

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-2023-0597 updated 2026-11-05 cvss 7.0

kernel: x86/mm: Randomize per-cpu entry area

Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
affected: no fix planned “Out of support scope”
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 (v. 9) libperf 5.14.0-362.8.1.el9_3, kernel-debuginfo-common-s390x 5.14.0-362.8.1.el9_3, kernel-debuginfo-common-x86_64 5.14.0-362.8.1.el9_3, kernel-debuginfo-common-aarch64 5.14.0-362.8.1.el9_3, kernel-debuginfo-common-ppc64le 5.14.0-362.8.1.el9_3
fixed: vendor fix RHSA-2023:6583
Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.95.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.95.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.95.1.el8_6
fixed: vendor fix RHSA-2024:1188
Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.81.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.81.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.81.1.el8_8
fixed: vendor fix RHSA-2024:10262
Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.95.1.el9_2
fixed: vendor fix RHSA-2024:10772
Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-362.8.1.el9_3, perf 5.14.0-362.8.1.el9_3, rtla 5.14.0-362.8.1.el9_3, kernel-devel-matched 5.14.0-362.8.1.el9_3, kernel-64k-devel-matched 5.14.0-362.8.1.el9_3, kernel-debug-devel-matched 5.14.0-362.8.1.el9_3, +6 more
fixed: vendor fix RHSA-2023:6583
Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.95.1.el9_2, rtla 5.14.0-284.95.1.el9_2, kernel-devel-matched 5.14.0-284.95.1.el9_2, kernel-64k-devel-matched 5.14.0-284.95.1.el9_2, kernel-debug-devel-matched 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.95.1.el9_2, +5 more
fixed: vendor fix RHSA-2024:10772

show 13 more

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 (v. 9) bpftool 7.2.0-362.8.1.el9_3, kernel 5.14.0-362.8.1.el9_3, kernel-64k 5.14.0-362.8.1.el9_3, kernel-core 5.14.0-362.8.1.el9_3, kernel-tools 5.14.0-362.8.1.el9_3, python3-perf 5.14.0-362.8.1.el9_3, +28 more
fixed: vendor fix RHSA-2023:6583
Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.95.1.el8_6, kernel 4.18.0-372.95.1.el8_6, bpftool 4.18.0-372.95.1.el8_6, kernel-core 4.18.0-372.95.1.el8_6, kernel-tools 4.18.0-372.95.1.el8_6, python3-perf 4.18.0-372.95.1.el8_6, +15 more
fixed: vendor fix RHSA-2024:1188
Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.81.1.el8_8, kernel 4.18.0-477.81.1.el8_8, bpftool 4.18.0-477.81.1.el8_8, kernel-core 4.18.0-477.81.1.el8_8, kernel-tools 4.18.0-477.81.1.el8_8, python3-perf 4.18.0-477.81.1.el8_8, +15 more
fixed: vendor fix RHSA-2024:10262
Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.95.1.el9_2, kernel 5.14.0-284.95.1.el9_2, kernel-64k 5.14.0-284.95.1.el9_2, kernel-core 5.14.0-284.95.1.el9_2, kernel-tools 5.14.0-284.95.1.el9_2, python3-perf 5.14.0-284.95.1.el9_2, +28 more
fixed: vendor fix RHSA-2024:10772
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
fixed: vendor fix RHSA-2023:6901
Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-362.8.1.el9_3, kernel-rt-core 5.14.0-362.8.1.el9_3, kernel-rt-modules 5.14.0-362.8.1.el9_3, kernel-rt-debug-core 5.14.0-362.8.1.el9_3, kernel-rt-modules-core 5.14.0-362.8.1.el9_3, kernel-rt-debug-modules 5.14.0-362.8.1.el9_3, +4 more
fixed: vendor fix RHSA-2023:6583
Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-modules 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-modules-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-modules 5.14.0-284.95.1.rt14.380.el9_2, +4 more
fixed: vendor fix RHSA-2024:10773
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 Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-362.8.1.el9_3, kernel-rt-kvm 5.14.0-362.8.1.el9_3, kernel-rt-core 5.14.0-362.8.1.el9_3, kernel-rt-modules 5.14.0-362.8.1.el9_3, kernel-rt-debug-kvm 5.14.0-362.8.1.el9_3, kernel-rt-debug-core 5.14.0-362.8.1.el9_3, +6 more
fixed: vendor fix RHSA-2023:6583
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-kvm 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-modules 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-kvm 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-core 5.14.0-284.95.1.rt14.380.el9_2, +6 more
fixed: vendor fix RHSA-2024:10773
Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.95.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.95.1.el8_6
fixed: vendor fix RHSA-2024:1188
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.95.1.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: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 19 mo ago (2025-03-12)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

openwall.com https://www.openwall.com/lists/oss-security/2023/07/28/1 referenced PoC, tagged "exploit" by a source, unverified

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:H/I:N/A:N
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

n/a Kernel

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-401 Missing Release of Memory after Effective Lifetime

Technology feeds

Linux kernel rss critical rss

References

git.kernel.org /linus/97e3d26b5e5f371b3ee223d94dd123e6c442ba80
mailing-list, patch
openwall.com /lists/oss-security/2023/07/28/1
exploit
openwall.com /lists/oss-security/2023/07/28/1
mailing-list

Sources

CVE List CVE-2023-0597
NVD CVE-2023-0597

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