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NVD / CVE Program· CNA redhat

CVE-2020-14356: A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 63.1% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-305.el8; linux (Debian:12) 5.7.10-1; linux (Debian:9) 4.9.240-1.
  • Mentioned 3 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to kernel-tools-libs-devel (AlmaLinux:8) 4.18.0-305.el8; linux (Debian:12) 5.7.10-1; linux (Debian:9) 4.9.240-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system. A local user could use this flaw to crash the system or escalate their privileges on the system.

HighCVSS 7.8 · v3.1—Proof of concept Fix available
Published
Aug 19, 2020
Updated
Jun 16, 2026
EPSS
1.0% · 63th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux
opensuseleap
debiandebian linux
canonicalubuntu linux
netappactive iq unified manager
netappcloud backup
netapphci management node
netappsolidfire
netappsolidfire baseboard management controller firmware
netappsolidfire baseboard management controller

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux20.04
  • debian debian linux9.0
  • linux linux kernel4.5 and later · before 4.9.231
  • linux linux kernel4.10 and later · before 4.14.189
  • linux linux kernel4.15 and later · before 4.19.134
  • linux linux kernel4.20 and later · before 5.4.53
  • linux linux kernel5.5 and later · before 5.7.10
  • netapp active iq unified managerall versions
  • netapp cloud backupall versions
  • netapp hci management nodeall versions
  • netapp solidfireall versions
  • netapp solidfire baseboard management controller firmwareall versions
  • opensuse leap15.1
  • opensuse leap15.2
  • redhat enterprise linux8.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a Kernel

    • Kernel versions before 5.7.10affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8kernel-tools-libs-develbefore 4.18.0-305.el84.18.0-305.el8
Debian:12linuxbefore 5.7.10-15.7.10-1
Debian:9linuxbefore 4.9.240-14.9.240-1
Debian:9linux-4.19before 4.19.146-1~deb9u14.19.146-1~deb9u1
openSUSE:Leap 15.1kernel-debugbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-defaultbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-docsbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-kvmsmallbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-obs-buildbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-obs-qabefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-sourcebefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-symsbefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.1kernel-vanillabefore 4.12.14-lp151.28.63.14.12.14-lp151.28.63.1
openSUSE:Leap 15.2bbswitchbefore 0.8-lp152.6.2.10.8-lp152.6.2.1
openSUSE:Leap 15.2crashbefore 7.2.8-lp152.3.2.17.2.8-lp152.3.2.1
openSUSE:Leap 15.2dpdkbefore 19.11.1-lp152.2.5.119.11.1-lp152.2.5.1
openSUSE:Leap 15.2drbdbefore 9.0.22~1+git.fe2b5983-lp152.2.2.19.0.22~1+git.fe2b5983-lp152.2.2.1
openSUSE:Leap 15.2hdjmodbefore 1.28-lp152.6.2.11.28-lp152.6.2.1
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.36.15.3.18-lp152.36.1
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.36.15.3.18-lp152.36.1
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.36.15.3.18-lp152.36.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.36.15.3.18-lp152.36.1
openSUSE:Leap 15.2kernel-obs-buildbefore 5.3.18-lp152.36.15.3.18-lp152.36.1
openSUSE:Leap 15.2kernel-obs-qabefore 5.3.18-lp152.36.15.3.18-lp152.36.1

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2020-16166Jul 30, 2020 · The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal st
    16Monitor
  • ← EarlierCVE-2020-24394Aug 19, 2020 · In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesys
    28Monitor
  • Later →CVE-2020-10720Sep 3, 2020 · A flaw was found in the Linux kernel's implementation of GRO in versions before 5.2.
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:kernel-tools-libs-devel4.18.0-305.el8 · AlmaLinux:8Package registry (OSV)
debian:linux5.7.10-1 · Debian:12Package registry (OSV)
debian:linux-4.194.19.146-1~deb9u1 · Debian:9Package registry (OSV)
opensuse:bbswitch0.8-lp152.6.2.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:crash7.2.8-lp152.3.2.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:dpdk19.11.1-lp152.2.5.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:drbd9.0.22~1+git.fe2b5983-lp152.2.2.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:hdjmod1.28-lp152.6.2.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-debug5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-docs5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-build5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-qa5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-preempt5.3.18-lp152.36.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:bpftool0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-305.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
suse:kernel-azure5.3.18-18.15.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2Package registry (OSV)
suse:kernel-default5.3.18-24.12.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-default-base5.3.18-24.12.1.9.4.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)

+9

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02022-04-23

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+612 d
  3. TodayNov 10, 2026+2274 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records