A flaw was found in the Linux kernel before 5.9-rc4.

published 2020-09-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6526

cvss: 6.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

A flaw was found in the Linux kernel before 5.9-rc4. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity.

Patch / fix

fixed in 1 distros 6 links 3

linux linux_kernel 4.9.239, 4.14.201, 4.19.150, 5.4.64, 5.8.8

debian ubuntu red hat suse opensuse arch linux

linux Debian 14, Debian 13, Debian 12 5.8.7-1

debian advisories DEBIAN-CVE-2020-14386

linux Ubuntu 18.04 LTS 4.15.0-117.118
linux Ubuntu 20.04 LTS 5.4.0-47.51
linux-aws Ubuntu 18.04 LTS 4.15.0-1082.86
linux-aws Ubuntu 20.04 LTS 5.4.0-1024.24
linux-gcp Ubuntu 16.04 LTS 4.15.0-1083.94~16.04.1
linux-gcp Ubuntu 20.04 LTS 5.4.0-1024.24
linux-hwe Ubuntu 16.04 LTS 4.15.0-117.118~16.04.1
linux-hwe Ubuntu 18.04 LTS 5.3.0-67.61

ubuntu advisories UBUNTU-CVE-2020-14386

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 8 4.18.0-193.28.1.el8_2
perf RHEL 8 4.18.0-193.28.1.el8_2
bpftool RHEL 8 4.18.0-193.28.1.el8_2
kernel-core RHEL 8 4.18.0-193.28.1.el8_2
kernel-tools RHEL 8 4.18.0-193.28.1.el8_2
python3-perf RHEL 8 4.18.0-193.28.1.el8_2
kernel-modules RHEL 8 4.18.0-193.28.1.el8_2
kernel-zfcpdump RHEL 8 4.18.0-193.28.1.el8_2

red hat advisories RHSA-2020:5199 RHSA-2020:4286 RHSA-2020:4332 RHSA-2020:4287 RHSA-2020:4331 RHSA-2020:4289

kernel-rt Real Time Module 15 SP1 4.12.14-14.36.1
kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.36.1
kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.36.1
kernel-source-rt Real Time Module 15 SP1 4.12.14-14.36.1
kernel-rt SLE Real Time 12 SP5 4.12.14-10.19.1
kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.19.1
kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.19.1
kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.19.1

suse advisories SUSE-SU-2020:3210-1 SUSE-SU-2020:3225-1 SUSE-SU-2020:3204-1 SUSE-SU-2020:3190-1 SUSE-SU-2020:3187-1 SUSE-SU-2020:3186-1

kernel-source openSUSE Tumbleweed 5.14.6-1.4
kernel-source openSUSE Tumbleweed 6.6.17-1.1
kernel-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
kernel-syms-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
kernel-rt_debug openSUSE Leap 15.2 5.3.18-lp152.3.5.1
kernel-source-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.71.1
kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.71.2

opensuse advisories openSUSE-SU-2024:10728-1 openSUSE-SU-2024:13704-1 openSUSE-SU-2021:0242-1 openSUSE-SU-2020:1655-1 openSUSE-SU-2020:1382-1 openSUSE-SU-2020:1379-1

linux Arch Linux 5.8.8.arch1-1
linux-lts Arch Linux 5.4.64-1
linux-zen Arch Linux 5.8.8.zen1-1
linux-hardened Arch Linux 5.8.a-1

arch linux advisories AVG-1222 AVG-1223 AVG-1224 AVG-1237

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-2020-14386 updated 2026-11-06 cvss 7.8

kernel: memory corruption in net/packet/af_packet.c leads to elevation of privilege

Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.28.1.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.28.1.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.28.1.el8_2
fixed: vendor fix RHSA-2020:4286
Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-debuginfo-common-x86_64 4.18.0-147.32.1.el8_1, kernel-debuginfo-common-aarch64 4.18.0-147.32.1.el8_1, kernel-debuginfo-common-ppc64le 4.18.0-147.32.1.el8_1
fixed: vendor fix RHSA-2020:4287
Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.28.1.el8_2, kernel 4.18.0-193.28.1.el8_2, bpftool 4.18.0-193.28.1.el8_2, kpatch-patch-4_18_0-193 1-7.el8, kernel-core 4.18.0-193.28.1.el8_2, kernel-tools 4.18.0-193.28.1.el8_2, +21 more
fixed: vendor fix RHSA-2020:4286
Red Hat Enterprise Linux BaseOS E4S (v. 8.0) perf 4.18.0-80.31.1.el8_0, kernel 4.18.0-80.31.1.el8_0, bpftool 4.18.0-80.31.1.el8_0, kernel-core 4.18.0-80.31.1.el8_0, kernel-tools 4.18.0-80.31.1.el8_0, python3-perf 4.18.0-80.31.1.el8_0, +9 more
fixed: vendor fix RHSA-2020:5199
Red Hat Enterprise Linux BaseOS EUS (v. 8.1) perf 4.18.0-147.32.1.el8_1, kernel 4.18.0-147.32.1.el8_1, bpftool 4.18.0-147.32.1.el8_1, kpatch-patch-4_18_0-147 1-18.el8, kernel-core 4.18.0-147.32.1.el8_1, kernel-tools 4.18.0-147.32.1.el8_1, +25 more
fixed: vendor fix RHSA-2020:4287
Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-core 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-modules 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-debug-core 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-debug-modules 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-modules-extra 4.18.0-193.28.1.rt13.77.el8_2, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-kvm 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-core 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-modules 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-debug-kvm 4.18.0-193.28.1.rt13.77.el8_2, kernel-rt-debug-core 4.18.0-193.28.1.rt13.77.el8_2, +4 more
fixed: vendor fix RHSA-2020:4289
Red Hat Enterprise Linux 5 kernel 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, kernel-alt, python-perf, +9 more Red Hat Enterprise MRG 2 kernel
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

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	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	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

Linux Kernel kernel

Classification

Weakness

CWE-787 Out-of-bounds Write
CWE-250 Execution with Unnecessary Privileges

Technology feeds

Linux kernel rss critical rss

References

git.kernel.org /pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acf69c946233259ab4d64f8869d4037a198c7f06
patch, vendor-advisory
seclists.org /oss-sec/2020/q3/146
mailing-list, patch, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=CVE-2020-14386
issue-tracking, patch, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/RNCPXERMUHPSGF6S2VVFL5NVVPBBFB63/
vendor-advisory
lists.opensuse.org /opensuse-security-announce/2020-10/msg00021.html
vendor-advisory, mailing-list, third-party-advisory
lists.debian.org /debian-lts-announce/2020/09/msg00025.html
mailing-list, third-party-advisory
packetstormsecurity.com /files/159565/Kernel-Live-Patch-Security-Notice-LSN-0072-1.html
third-party-advisory, vdb-entry
lists.debian.org /debian-lts-announce/2020/10/msg00032.html
mailing-list, third-party-advisory
lists.debian.org /debian-lts-announce/2020/10/msg00034.html
mailing-list, third-party-advisory
openwall.com /lists/oss-security/2021/09/17/2
mailing-list, third-party-advisory
openwall.com /lists/oss-security/2021/09/17/4
mailing-list, third-party-advisory
openwall.com /lists/oss-security/2021/09/21/1
mailing-list, third-party-advisory

Sources

CVE List CVE-2020-14386
NVD CVE-2020-14386

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