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Fencer Vulns
high 7.1

CVE-2020-36386 json

An issue was discovered in the Linux kernel before 5.8.1.

published 2021-06-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23917

cvss
7.1
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 46%
public exploits
0
none known

Summary

An issue was discovered in the Linux kernel before 5.8.1. net/bluetooth/hci_event.c has a slab out-of-bounds read in hci_extended_inquiry_result_evt, aka CID-51c19bf3d5cf.

Patch / fix

  • linux linux_kernel 5.8.1
  • linux Debian 14, Debian 13, Debian 12 5.7.17-1

debian advisories DEBIAN-CVE-2020-36386

  • linux Ubuntu 16.04 LTS 4.4.0-190.220
  • linux Ubuntu 18.04 LTS 4.15.0-118.119
  • linux Ubuntu 20.04 LTS 5.4.0-48.52
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1114.127
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1083.87
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1025.25
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1084.95~16.04.1
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1025.25

ubuntu advisories UBUNTU-CVE-2020-36386

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 4.18.0-348.el8
  • perf RHEL 8 4.18.0-348.el8
  • bpftool RHEL 8 4.18.0-348.el8
  • kernel-core RHEL 8 4.18.0-348.el8
  • kernel-tools RHEL 8 4.18.0-348.el8
  • python3-perf RHEL 8 4.18.0-348.el8
  • kernel-modules RHEL 8 4.18.0-348.el8
  • kernel-zfcpdump RHEL 8 4.18.0-348.el8

red hat advisories RHSA-2021:4356RHSA-2021:4140

  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.83.1
  • kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.83.1
  • kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.83.1
  • kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.83.1
  • kernel-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.68.1
  • kernel-syms-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.68.1
  • kernel-source-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.68.1
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.54.1

suse advisories SUSE-SU-2021:2647-1SUSE-SU-2021:2644-1SUSE-SU-2021:2643-1SUSE-SU-2021:2451-1SUSE-SU-2021:2427-1SUSE-SU-2021:2426-1

  • kernel-default openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-vanilla openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-kvmsmall openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-zfcpdump openSUSE Leap 15.3 4.12.14-197.99.1
  • kernel-azure openSUSE Leap 15.3 5.3.18-38.8.1
  • kernel-syms-azure openSUSE Leap 15.3 5.3.18-38.8.1
  • kernel-source-azure openSUSE Leap 15.3 5.3.18-38.8.1
  • kernel-64kb openSUSE Leap 15.3 5.3.18-59.10.1

opensuse advisories openSUSE-SU-2021:2427-1openSUSE-SU-2021:2202-1openSUSE-SU-2021:2184-1

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-2020-36386 updated cvss 7.1

kernel: slab out-of-bounds read in hci_extended_inquiry_result_evt() in net/bluetooth/hci_event.c

  • 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
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-348.el8, kernel-debuginfo-common-aarch64 4.18.0-348.el8, kernel-debuginfo-common-ppc64le 4.18.0-348.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-348.el8, kernel 4.18.0-348.el8, bpftool 4.18.0-348.el8, kernel-core 4.18.0-348.el8, kernel-tools 4.18.0-348.el8, python3-perf 4.18.0-348.el8, +15 more
    fixed: vendor fix RHSA-2021:4356
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, kernel-rt-debug-modules 4.18.0-348.rt7.130.el8, kernel-rt-modules-extra 4.18.0-348.rt7.130.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-kvm 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-kvm 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, +4 more
    fixed: vendor fix RHSA-2021:4140
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +81 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

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • syzkaller.appspot.com https://syzkaller.appspot.com/text?tag=ReproC&x=15ca2f46900000 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 5.6 AV:L/AC:L/Au:N/C:P/I:N/A:C

Classification

Weakness
Technology feeds

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.