MEDIUM
CVE-2020-12771
CWE-667Published: May 9, 2020· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official Description
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.
Technical Analysis
CVE-2020-12771 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
Linux1 product(s)
linux kernel
netapp32 product(s)
active iq unified managercloud backupelement softwarehci management nodesolidfiresteelstore cloud integrated storagehci bootstrap oshci compute nodea700s firmwarea700sh300s firmwareh300s+20
openSUSE1 product(s)
leap
Oracle1 product(s)
sd-wan edge
Source: NVD CPE · 41 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttps://usn.ubuntu.com/4462-1/
ADVISORYhttps://usn.ubuntu.com/4463-1/
ADVISORYhttps://usn.ubuntu.com/4465-1/
ADVISORYhttps://usn.ubuntu.com/4483-1/
ADVISORYhttps://usn.ubuntu.com/4485-1/
ADVISORYhttps://usn.ubuntu.com/4462-1/
ADVISORYhttps://usn.ubuntu.com/4463-1/
ADVISORYhttps://usn.ubuntu.com/4465-1/
ADVISORYhttps://usn.ubuntu.com/4483-1/
ADVISORYhttps://usn.ubuntu.com/4485-1/
All References (26)
→
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00071.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/08/msg00019.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlMailing List · Third Party Advisory
→
https://lkml.org/lkml/2020/4/26/87Exploit · Mailing List · Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200608-0001/Third Party Advisory
→
https://usn.ubuntu.com/4462-1/Third Party Advisory
→
https://usn.ubuntu.com/4463-1/Third Party Advisory
→
https://usn.ubuntu.com/4465-1/Third Party Advisory
→
https://usn.ubuntu.com/4483-1/Third Party Advisory
→
https://usn.ubuntu.com/4485-1/Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00071.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing List · Third Party Advisory
Quick Facts
CVE IDCVE-2020-12771
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-667
CISA KEVNo
Affected6 vendor(s)
PublishedMay 9, 2020
Related CVEs (CWE-667)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-12771 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.