CVE-2019-20908 json
An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4.
published 6y ago modified 4mo ago also EUVD-2019-11442
- cvss
- 6.7
- 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 45%
- public exploits
- 0
- none known
Summary
An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.
Patch / fix
- linux linux_kernel 5.4
- linux Debian 14, Debian 13, Debian 12 5.2.6-1
debian advisories DEBIAN-CVE-2019-20908
- linux Ubuntu 18.04 LTS 4.15.0-112.113
- linux-aws Ubuntu 18.04 LTS 4.15.0-1079.83
- linux-gcp Ubuntu 16.04 LTS 4.15.0-1080.90~16.04.1
- linux-hwe Ubuntu 16.04 LTS 4.15.0-112.113~16.04.1
- linux-hwe Ubuntu 18.04 LTS 5.3.0-64.58~18.04.1
- linux-kvm Ubuntu 18.04 LTS 4.15.0-1071.72
- linux-oem Ubuntu 18.04 LTS 4.15.0-1093.103
- linux-azure Ubuntu 16.04 LTS 4.15.0-1092.102~16.04.1
ubuntu advisories UBUNTU-CVE-2019-20908
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 4.18.0-193.14.3.el8_2
- perf RHEL 8 4.18.0-193.14.3.el8_2
- bpftool RHEL 8 4.18.0-193.14.3.el8_2
- kernel-core RHEL 8 4.18.0-193.14.3.el8_2
- kernel-tools RHEL 8 4.18.0-193.14.3.el8_2
- python3-perf RHEL 8 4.18.0-193.14.3.el8_2
- kernel-modules RHEL 8 4.18.0-193.14.3.el8_2
- kernel-zfcpdump RHEL 8 4.18.0-193.14.3.el8_2
red hat advisories RHSA-2020:3222RHSA-2020:3218RHSA-2020:3228RHSA-2020:3219
- 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-2020:2122-1SUSE-SU-2020:2121-1SUSE-SU-2020:2119-1SUSE-SU-2020:2107-1
- 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
Is CVE-2019-20908 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2019-20908 updated cvss 6.4
kernel: lockdown: bypass through ACPI write via efivar_ssdt
-
Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.14.3.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.14.3.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.14.3.el8_2fixed: vendor fix RHSA-2020:3218
-
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_1fixed: vendor fix RHSA-2020:3222
-
Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.14.3.el8_2, kernel 4.18.0-193.14.3.el8_2, bpftool 4.18.0-193.14.3.el8_2, kernel-core 4.18.0-193.14.3.el8_2, kernel-tools 4.18.0-193.14.3.el8_2, python3-perf 4.18.0-193.14.3.el8_2, +15 morefixed: vendor fix RHSA-2020:3218
-
Red Hat Enterprise Linux BaseOS E4S (v. 8.0) perf 4.18.0-80.27.2.el8_0, kernel 4.18.0-80.27.2.el8_0, bpftool 4.18.0-80.27.2.el8_0, kernel-core 4.18.0-80.27.2.el8_0, kernel-tools 4.18.0-80.27.2.el8_0, python3-perf 4.18.0-80.27.2.el8_0, +9 morefixed: vendor fix RHSA-2020:3228
-
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, kernel-core 4.18.0-147.24.2.el8_1, kernel-tools 4.18.0-147.24.2.el8_1, python3-perf 4.18.0-147.24.2.el8_1, +15 morefixed: vendor fix RHSA-2020:3222
-
Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-core 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-modules 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-debug-core 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-debug-modules 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-modules-extra 4.18.0-193.14.3.rt13.67.el8_2, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-kvm 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-core 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-modules 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-debug-kvm 4.18.0-193.14.3.rt13.67.el8_2, kernel-rt-debug-core 4.18.0-193.14.3.rt13.67.el8_2, +4 morefixed: vendor fix RHSA-2020:3219
-
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-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmwarenot 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
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.9 | AV:L/AC:M/Au:N/C:C/I:C/A:C |
Classification
- Technology feeds
References
-
git.kernel.org
/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
patch, vendor-advisory
-
git.zx2c4.com
/american-unsigned-language/tree/american-unsigned-language.sh
patch, third-party-advisory
-
usn.ubuntu.com
/4427-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4439-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4426-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4440-1/
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-08/msg00009.html
vendor-advisory, mailing-list, third-party-advisory
-
cdn.kernel.org
/pub/linux/kernel/v5.x/ChangeLog-5.4
release-notes, vendor-advisory
-
mailarchives.bentasker.co.uk
/Mirrors/OSSSec/2020/06-Jun/msg00035.html
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2020/07/20/6
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2020/07/29/3
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2020/07/30/3
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2020/07/30/2
mailing-list, third-party-advisory
Sources
- CVE List CVE-2019-20908
- NVD CVE-2019-20908
Fencer Intel 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.