A buffer over-read flaw was found in RH kernel versions before 5.0 in crypto_authenc_extractkeys in crypto/authenc.c in the IPsec Cryptogra…

published 2020-06-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3184

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

A buffer over-read flaw was found in RH kernel versions before 5.0 in crypto_authenc_extractkeys in crypto/authenc.c in the IPsec Cryptographic algorithm's module, authenc. When a payload longer than 4 bytes, and is not following 4-byte alignment boundary guidelines, it causes a buffer over-read threat, leading to a system crash. This flaw allows a local attacker with user privileges to cause a denial of service.

Patch / fix

distros 5 links 1

debian ubuntu red hat suse opensuse

linux Debian 14, Debian 13, Debian 12 4.19.20-1

debian advisories DEBIAN-CVE-2020-10769

linux Ubuntu 16.04 LTS 4.4.0-145.171
linux Ubuntu 18.04 LTS 4.15.0-55.60
linux-aws Ubuntu 14.04 LTS 4.4.0-1040.43
linux-aws Ubuntu 16.04 LTS 4.4.0-1079.89
linux-aws Ubuntu 18.04 LTS 4.15.0-1047.49
linux-gcp Ubuntu 16.04 LTS 4.15.0-1037.39~16.04.1
linux-hwe Ubuntu 16.04 LTS 4.15.0-55.60~16.04.2
linux-hwe Ubuntu 18.04 LTS 5.0.0-23.24~18.04.1

ubuntu advisories UBUNTU-CVE-2020-10769

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-rt RHEL 7 EXTRAS_RT 3.10.0-1160.11.1.rt56.1145.el7
kernel-rt-kvm RHEL 7 EXTRAS_RT 3.10.0-1160.11.1.rt56.1145.el7
kernel-rt-trace RHEL 7 EXTRAS_RT 3.10.0-1160.11.1.rt56.1145.el7
kernel-rt-debug-kvm RHEL 7 EXTRAS_RT 3.10.0-1160.11.1.rt56.1145.el7
kernel-rt-trace-kvm RHEL 7 EXTRAS_RT 3.10.0-1160.11.1.rt56.1145.el7
kernel-rt-debuginfo-common-x86_64 RHEL 7 EXTRAS_RT 3.10.0-1160.11.1.rt56.1145.el7
kernel RHEL 7 3.10.0-1160.11.1.el7
perf RHEL 7 3.10.0-1160.11.1.el7

red hat advisories RHSA-2020:5441 RHSA-2020:5437 RHSA-2020:3545

kernel-syms SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 4.4.180-94.164.2
kernel-source SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 4.4.180-94.164.2
kernel-default SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.164.3
kgraft-patch-SLE12-SP3_Update_45 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, OpenStack Cloud Crowbar 8 +2 more 1-4.3.2
kernel-syms SLES 12 SP2-BCL 4.4.121-92.175.2
kernel-source SLES 12 SP2-BCL 4.4.121-92.175.2
kernel-default SLES 12 SP2-BCL 4.4.121-92.175.2
kernel-rt Real Time Module 15 SP1 4.12.14-14.28.1

suse advisories SUSE-SU-2022:2082-1 SUSE-SU-2022:2077-1 SUSE-SU-2020:2487-1 SUSE-SU-2020:2478-1 SUSE-SU-2020:2156-1 SUSE-SU-2020:2122-1

kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.59.1
kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.59.1
kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.59.1
kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.59.1
kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.59.1
kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.59.1
kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.59.1

opensuse advisories openSUSE-SU-2020:1153-1

lkml.org/lkml/2019/1/21/675 advisory

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-2020-10769 updated 2026-11-05 cvss 5.5

kernel: Buffer over-read in crypto_authenc_extractkeys() when a payload longer than 4 bytes is not aligned.

Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
affected: workaround, no fix planned “Will not fix”
Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, kernel-tools-libs 3.10.0-1160.11.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7
fixed: vendor fix RHSA-2020:5437
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perf 4.14.0-115.29.1.el7a, kernel 4.14.0-115.29.1.el7a, kernel-alt 4.14.0-115.29.1.el7a, python-perf 4.14.0-115.29.1.el7a, kernel-tools 4.14.0-115.29.1.el7a, kernel-tools-libs 4.14.0-115.29.1.el7a, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debuginfo-common-ppc64le 4.14.0-115.29.1.el7a
fixed: vendor fix RHSA-2020:3545
Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.11.1.rt56.1145.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debug-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.11.1.rt56.1145.el7
fixed: vendor fix RHSA-2020:5441
Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-kdump 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.11.1.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, kernel-tools-libs 3.10.0-1160.11.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7
fixed: vendor fix RHSA-2020:5437
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

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

lkml.org https://lkml.org/lkml/2019/1/21/675 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a Kernel

Classification

Weakness

CWE-125 Out-of-bounds Read

References

lkml.org /lkml/2019/1/21/675
exploit, mailing-list, patch, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-08/msg00009.html
vendor-advisory, mailing-list, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=1708775%3B
oracle.com /security-alerts/cpuApr2021.html

Sources

CVE List CVE-2020-10769
NVD CVE-2020-10769

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