CVE-2020-27820 json
A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that i…
published 2021-11-02 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20321
- cvss
- 4.7
- 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 43%
- public exploits
- 0
- none known
Summary
A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver).
Patch / fix
- linux linux_kernel 5.4.162, 5.10.82, 5.15.5
- linux Debian 14, Debian 13, Debian 12 5.15.5-1
debian advisories DEBIAN-CVE-2020-27820
- linux Ubuntu 20.04 LTS 5.4.0-110.124
- linux-aws Ubuntu 20.04 LTS 5.4.0-1073.78
- linux-gcp Ubuntu 20.04 LTS 5.4.0-1073.78
- linux-gke Ubuntu 20.04 LTS 5.4.0-1071.76
- linux-ibm Ubuntu 20.04 LTS 5.4.0-1021.23
- linux-iot Ubuntu 20.04 LTS 5.4.0-1004.6
- linux-kvm Ubuntu 20.04 LTS 5.4.0-1063.66
- linux-azure Ubuntu 20.04 LTS 5.4.0-1078.81
ubuntu advisories UBUNTU-CVE-2020-27820
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 4.18.0-372.9.1.el8
- perf RHEL 8 4.18.0-372.9.1.el8
- bpftool RHEL 8 4.18.0-372.9.1.el8
- kernel-core RHEL 8 4.18.0-372.9.1.el8
- kernel-tools RHEL 8 4.18.0-372.9.1.el8
- python3-perf RHEL 8 4.18.0-372.9.1.el8
- kernel-modules RHEL 8 4.18.0-372.9.1.el8
- kernel-zfcpdump RHEL 8 4.18.0-372.9.1.el8
red hat advisories RHSA-2022:1988RHSA-2022:1975
- kernel-syms SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.88.1
- kernel-source SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.88.1
- kernel-default SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLE Live Patching 12 SP4 +3 more 4.12.14-95.88.1
- kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.83.1
- kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.83.1
- kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.83.1
- kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.83.1
- kernel-obs-build SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.83.1
suse advisories SUSE-SU-2022:14905-1SUSE-SU-2022:0371-1SUSE-SU-2022:0367-1SUSE-SU-2022:0366-1SUSE-SU-2022:0197-1SUSE-SU-2022:0131-1
- kernel-default openSUSE Leap 15.3 4.12.14-197.105.1
- kernel-vanilla openSUSE Leap 15.3 4.12.14-197.105.1
- kernel-kvmsmall openSUSE Leap 15.3 4.12.14-197.105.1
- kernel-zfcpdump openSUSE Leap 15.3 4.12.14-197.105.1
- dtb-aarch64 openSUSE Leap 15.3 5.3.18-59.40.1
- kernel-64kb openSUSE Leap 15.3 5.3.18-59.40.1
- kernel-syms openSUSE Leap 15.3 5.3.18-59.40.1
- kernel-obs-qa openSUSE Leap 15.3 5.3.18-59.40.1
opensuse advisories openSUSE-SU-2022:0366-1openSUSE-SU-2022:0131-1openSUSE-SU-2022:0056-1
- kernel AlmaLinux 8 4.18.0-372.9.1.el8
- perf AlmaLinux 8 4.18.0-372.9.1.el8
- bpftool AlmaLinux 8 4.18.0-372.9.1.el8
- kernel-core AlmaLinux 8 4.18.0-372.9.1.el8
- kernel-tools AlmaLinux 8 4.18.0-372.9.1.el8
- python3-perf AlmaLinux 8 4.18.0-372.9.1.el8
- kernel-modules AlmaLinux 8 4.18.0-372.9.1.el8
- kernel-debug-core AlmaLinux 8 4.18.0-372.9.1.el8
almalinux advisories ALSA-2022:1988
- kernel Rocky Linux 8 4.18.0-372.9.1.el8
- kernel-rt Rocky Linux 8 4.18.0-372.9.1.rt7.166.el8
rocky linux advisories RLSA-2022:1988RLSA-2022:1975
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-2020-27820 updated cvss 4.1
kernel: use-after-free in nouveau kernel module
-
Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 moreaffected: workaround, no fix available “Fix deferred”
-
Red Hat Enterprise MRG 2 kernelaffected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-372.9.1.el8, kernel 4.18.0-372.9.1.el8, bpftool 4.18.0-372.9.1.el8, kernel-core 4.18.0-372.9.1.el8, kernel-tools 4.18.0-372.9.1.el8, python3-perf 4.18.0-372.9.1.el8, +15 more Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-372.9.1.el8, kernel-debuginfo-common-aarch64 4.18.0-372.9.1.el8, kernel-debuginfo-common-ppc64le 4.18.0-372.9.1.el8fixed: vendor fix RHSA-2022:1988
-
Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-372.9.1.rt7.166.el8, kernel-rt-kvm 4.18.0-372.9.1.rt7.166.el8, kernel-rt-core 4.18.0-372.9.1.rt7.166.el8, kernel-rt-modules 4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-kvm 4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-core 4.18.0-372.9.1.rt7.166.el8, +4 more Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-372.9.1.rt7.166.el8, kernel-rt-core 4.18.0-372.9.1.rt7.166.el8, kernel-rt-modules 4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-core 4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-modules 4.18.0-372.9.1.rt7.166.el8, kernel-rt-modules-extra 4.18.0-372.9.1.rt7.166.el8, +2 morefixed: vendor fix RHSA-2022:1975
-
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 9 rv, perf, rtla, kernel, bpftool, libperf, +82 morenot 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
0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.7 | AV:L/AC:M/Au:N/C:N/I:N/A:C |
Affected products
- n/a kernel
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
-
bugzilla.redhat.com
/show_bug.cgi?id=1901726
issue-tracking, patch, third-party-advisory
-
lore.kernel.org
/dri-devel/20201103194912.184413-2-jcline%40redhat.com/
mailing-list, vendor-advisory
-
lore.kernel.org
/dri-devel/20201103194912.184413-3-jcline%40redhat.com/
mailing-list, vendor-advisory
-
lore.kernel.org
/dri-devel/20201103194912.184413-4-jcline%40redhat.com/
mailing-list, vendor-advisory
-
oracle.com
/security-alerts/cpujul2022.html
third-party-advisory
Sources
- CVE List CVE-2020-27820
- NVD CVE-2020-27820
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.