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Noroxi
NVD / CVE Program· CNA mitre

CVE-2020-12771: An issue was discovered in the Linux kernel through 5.6.11.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.51% (FIRST EPSS).
  • 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: linux (Debian:12) 5.7.6-1; linux (Debian:9) 4.9.240-1; linux-4.19 (Debian:9) 4.19.132-1~deb9u2.
  • Mentioned 4 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to linux (Debian:12) 5.7.6-1; linux (Debian:9) 4.9.240-1; linux-4.19 (Debian:9) 4.19.132-1~deb9u2 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

An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c has a deadlock if a coalescing operation fails.

Published
May 9, 2020
Updated
Jun 16, 2026
EPSS
0.5% · 44th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • 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
debiandebian linux
opensuseleap
canonicalubuntu linux
netappactive iq unified manager
netappcloud backup
netappelement software
netapphci management node
netappsolidfire
netappsteelstore cloud integrated storage
netapphci bootstrap os
netapphci compute node

and 25 more

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 kernelup to 5.6.11 inclusive
  • netapp a700s firmwareall versions
  • netapp active iq unified managerall versions
+12 more rows
  • netapp cloud backupall versions
  • netapp element softwareall versions
  • netapp h300e firmwareall versions
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500e firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h610c firmwareall versions
  • netapp h610s firmwareall versions
  • netapp h615c firmwareall versions
  • netapp h700e firmwareall versions

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.7.6-15.7.6-1
Debian:9linuxbefore 4.9.240-14.9.240-1
Debian:9linux-4.19before 4.19.132-1~deb9u24.19.132-1~deb9u2
openSUSE:Leap 15.1kernel-debugbefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-defaultbefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-docsbefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-kvmsmallbefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-obs-buildbefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-obs-qabefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-sourcebefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-symsbefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.1kernel-vanillabefore 4.12.14-lp151.28.59.14.12.14-lp151.28.59.1
openSUSE:Leap 15.2kernel-debugbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-defaultbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-default-basebefore 5.3.18-lp152.33.1.lp152.8.4.45.3.18-lp152.33.1.lp152.8.4.4
openSUSE:Leap 15.2kernel-docsbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-kvmsmallbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-obs-buildbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-obs-qabefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-preemptbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-sourcebefore 5.3.18-lp152.33.15.3.18-lp152.33.1
openSUSE:Leap 15.2kernel-symsbefore 5.3.18-lp152.33.15.3.18-lp152.33.1
SUSE:HPE Helion OpenStack 8kernel-defaultbefore 4.4.180-94.127.14.4.180-94.127.1
SUSE:HPE Helion OpenStack 8kernel-sourcebefore 4.4.180-94.127.14.4.180-94.127.1

+48

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-2020-12768May 9, 2020 · An issue was discovered in the Linux kernel before 5.6.
    22Monitor
  • ← EarlierCVE-2020-12770May 9, 2020 · An issue was discovered in the Linux kernel through 5.6.11.
    26Monitor
  • Later →CVE-2019-20794May 9, 2020 · An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed.
    18Monitor

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
debian:linux5.7.6-1 · Debian:12Package registry (OSV)
debian:linux-4.194.19.132-1~deb9u2 · Debian:9Package registry (OSV)
opensuse:kernel-debug5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-default-base5.3.18-lp152.33.1.lp152.8.4.4 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-docs5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-build5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-obs-qa5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-preempt5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-source5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-syms5.3.18-lp152.33.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:kernel-vanilla4.12.14-lp151.28.59.1 · openSUSE:Leap 15.1Package registry (OSV)
suse:kernel-azure5.3.18-18.5.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2Package registry (OSV)
suse:kernel-default5.3.18-24.9.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-default-base5.3.18-24.9.1.9.2.6 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-docs5.3.18-24.9.2 · SUSE:Linux Enterprise Module for Development Tools 15 SP2Package registry (OSV)
suse:kernel-livepatch-SLE15_Update_191-1.3.1 · SUSE:Linux Enterprise Live Patching 15Package registry (OSV)
suse:kernel-livepatch-SLE15-SP2_Update_11-5.3.6 · SUSE:Linux Enterprise Live Patching 15 SP2Package registry (OSV)
suse:kernel-obs-build5.3.18-24.9.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP2Package registry (OSV)
suse:kernel-preempt5.3.18-24.9.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-source5.3.18-24.9.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)
suse:kernel-source-azure5.3.18-18.5.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2Package registry (OSV)
suse:kernel-syms5.3.18-24.9.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP2Package registry (OSV)
suse:kernel-syms-azure5.3.18-18.5.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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

Weakness class (CWE)

CWE-667 · Improper Locking

CVSS vector

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

References

Show all references (11 more)

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

All records