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Fencer Vulns
medium 5.5

CVE-2020-10767 json

A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB (Indirect Branch Prediction Barrier).

published 2020-09-15 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3182

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB (Indirect Branch Prediction Barrier). The IBPB mitigation will be disabled when STIBP is not available or when the Enhanced Indirect Branch Restricted Speculation (IBRS) is available. This flaw allows a local attacker to perform a Spectre V2 style attack when this configuration is active. The highest threat from this vulnerability is to confidentiality.

Patch / fix

  • linux linux_kernel 5.8.0
  • linux Debian 14, Debian 13, Debian 12 5.7.6-1

debian advisories DEBIAN-CVE-2020-10767

  • linux Ubuntu 16.04 LTS 4.4.0-186.216
  • linux Ubuntu 18.04 LTS 4.15.0-115.116
  • linux Ubuntu 20.04 LTS 5.4.0-45.49
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1111.123
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1080.84
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1022.22
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1081.92~16.04.1
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1022.22

ubuntu advisories UBUNTU-CVE-2020-10767

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

  • kpatch-patch-4_18_0-193 RHEL 8 1-5.el8
  • kpatch-patch-4_18_0-193_1_2 RHEL 8 1-3.el8_2
  • kpatch-patch-4_18_0-193_6_3 RHEL 8 1-2.el8_2
  • kernel-rt RHEL 8 4.18.0-193.13.2.rt13.65.el8_2
  • kernel-rt-kvm RHEL 8 4.18.0-193.13.2.rt13.65.el8_2
  • kernel-rt-core RHEL 8 4.18.0-193.13.2.rt13.65.el8_2
  • kernel-rt-modules RHEL 8 4.18.0-193.13.2.rt13.65.el8_2
  • kernel-rt-debug-kvm RHEL 8 4.18.0-193.13.2.rt13.65.el8_2

red hat advisories RHSA-2020:3222RHSA-2020:3297RHSA-2020:3073RHSA-2020:3041RHSA-2020:3016RHSA-2020:3010

  • kernel-rt Real Time Module 15 SP1 4.12.14-14.28.1
  • kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.28.1
  • kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.28.1
  • kernel-source-rt Real Time Module 15 SP1 4.12.14-14.28.1
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.13.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.13.1
  • kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.13.1
  • kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.13.1

suse advisories SUSE-SU-2020:2487-1SUSE-SU-2020:2478-1SUSE-SU-2020:2156-1SUSE-SU-2020:2134-1SUSE-SU-2020:2121-1SUSE-SU-2020:2107-1

  • 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-lp151.28.59.1
  • kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.59.1

opensuse advisories openSUSE-SU-2024:10728-1openSUSE-SU-2024:13704-1openSUSE-SU-2021:0242-1openSUSE-SU-2020:1153-1openSUSE-SU-2020:0935-1

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-2020-10767 updated cvss 5.5

kernel: Indirect Branch Prediction Barrier is force-disabled when STIBP is unavailable or enhanced IBRS is available.

  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.13.2.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.13.2.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.13.2.el8_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:3010
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-debuginfo-common-x86_64 4.18.0-147.24.2.el8_1, kernel-debuginfo-common-aarch64 4.18.0-147.24.2.el8_1, kernel-debuginfo-common-ppc64le 4.18.0-147.24.2.el8_1
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:3222
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.13.2.el8_2, kernel 4.18.0-193.13.2.el8_2, bpftool 4.18.0-193.13.2.el8_2, kpatch-patch-4_18_0-193 1-5.el8, kernel-core 4.18.0-193.13.2.el8_2, kernel-tools 4.18.0-193.13.2.el8_2, +18 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:3010
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.0) perf 4.18.0-80.27.1.el8_0, kernel 4.18.0-80.27.1.el8_0, bpftool 4.18.0-80.27.1.el8_0, kernel-core 4.18.0-80.27.1.el8_0, kernel-tools 4.18.0-80.27.1.el8_0, python3-perf 4.18.0-80.27.1.el8_0, +9 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:3041
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) perf 4.18.0-147.24.2.el8_1, kernel 4.18.0-147.24.2.el8_1, bpftool 4.18.0-147.24.2.el8_1, kpatch-patch-4_18_0-147 1-16.el8, kernel-core 4.18.0-147.24.2.el8_1, kernel-tools 4.18.0-147.24.2.el8_1, +23 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:3222
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-core 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-modules 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-debug-core 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-debug-modules 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-modules-extra 4.18.0-193.13.2.rt13.65.el8_2, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-kvm 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-core 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-modules 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-debug-kvm 4.18.0-193.13.2.rt13.65.el8_2, kernel-rt-debug-core 4.18.0-193.13.2.rt13.65.el8_2, +4 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2020:3016
  • 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 Linux BaseOS E4S (v. 8.0) kernel-headers 4.18.0-80.27.1.el8_0, kernel-cross-headers 4.18.0-80.27.1.el8_0 Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    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

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 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
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Linux Kernel kernel

Classification

Weakness
  • CWE-440 Expected Behavior Violation
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.