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Fencer Vulns
high 7.8

CVE-2023-21102 json

In __efi_rt_asm_wrapper of efi-rt-wrapper.S, there is a possible bypass of shadow stack protection due to a logic error in the code.

published 2023-05-15 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-25270

cvss
7.8
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 7%
public exploits
0
none known

Summary

In __efi_rt_asm_wrapper of efi-rt-wrapper.S, there is a possible bypass of shadow stack protection due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-260821414References: Upstream kernel

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 6.1.8-1

debian advisories DEBIAN-CVE-2023-21102

  • linux Ubuntu 22.04 LTS 5.15.0-70.77
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1034.38
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1032.40
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1031.36
  • linux-ibm Ubuntu 22.04 LTS 5.15.0-1028.31
  • linux-kvm Ubuntu 22.04 LTS 5.15.0-1031.36
  • linux-azure Ubuntu 22.04 LTS 5.15.0-1036.43
  • linux-gkeop Ubuntu 22.04 LTS 5.15.0-1018.23

ubuntu advisories UBUNTU-CVE-2023-21102

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 5.14.0-284.30.1.el9_2
  • perf RHEL 9 5.14.0-284.30.1.el9_2
  • rtla RHEL 9 5.14.0-284.30.1.el9_2
  • bpftool RHEL 9 7.0.0-284.30.1.el9_2
  • kernel-64k RHEL 9 5.14.0-284.30.1.el9_2
  • kernel-core RHEL 9 5.14.0-284.30.1.el9_2
  • kernel-tools RHEL 9 5.14.0-284.30.1.el9_2
  • python3-perf RHEL 9 5.14.0-284.30.1.el9_2

red hat advisories RHSA-2023:5069RHSA-2023:5091

  • 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-2023:2871-1SUSE-SU-2023:2831-1SUSE-SU-2023:2820-1SUSE-SU-2023:2809-1SUSE-SU-2023:2782-1SUSE-SU-2023:2646-1

  • kernel AlmaLinux 9 5.14.0-284.30.1.el9_2
  • perf AlmaLinux 9 5.14.0-284.30.1.el9_2
  • rtla AlmaLinux 9 5.14.0-284.30.1.el9_2
  • bpftool AlmaLinux 9 7.0.0-284.30.1.el9_2
  • kernel-64k AlmaLinux 9 5.14.0-284.30.1.el9_2
  • kernel-core AlmaLinux 9 5.14.0-284.30.1.el9_2
  • kernel-tools AlmaLinux 9 5.14.0-284.30.1.el9_2
  • python3-perf AlmaLinux 9 5.14.0-284.30.1.el9_2

almalinux advisories ALSA-2023:5069ALSA-2023:5091

  • kernel-rt Rocky Linux 9 5.14.0-284.30.1.rt14.315.el9_2

rocky linux advisories RLSA-2023:5091

  • hyperv-daemons CBL-Mariner 2.0 5.15.118.1-1

azure linux advisories AZL-26872

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-2023-21102 updated cvss 7.8

kernel: bypass of shadow stack protection due to a logic error

  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-284.30.1.el9_2, rtla 5.14.0-284.30.1.el9_2, kernel-devel-matched 5.14.0-284.30.1.el9_2, kernel-64k-devel-matched 5.14.0-284.30.1.el9_2, kernel-debug-devel-matched 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.30.1.el9_2, +5 more Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.0.0-284.30.1.el9_2, kernel 5.14.0-284.30.1.el9_2, kernel-64k 5.14.0-284.30.1.el9_2, kernel-core 5.14.0-284.30.1.el9_2, kernel-tools 5.14.0-284.30.1.el9_2, python3-perf 5.14.0-284.30.1.el9_2, +28 more Red Hat Enterprise Linux CRB (v. 9) kernel-debuginfo-common-s390x 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.30.1.el9_2
    fixed: vendor fix RHSA-2023:5069
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-kvm 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-modules 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-kvm 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-core 5.14.0-284.30.1.rt14.315.el9_2, +6 more Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-modules 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-modules-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-modules 5.14.0-284.30.1.rt14.315.el9_2, +4 more
    fixed: vendor fix RHSA-2023:5091
  • 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 AppStream (v. 9) kernel-doc 5.14.0-284.30.1.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
total
Assessed
21 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • source.android.com https://source.android.com/security/bulletin/2023-05-01 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a Android

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

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.