CVE-2020-12771: canonical ubuntu_linux Improper Locking
Vulnerability summary
CVE-2020-12771 is a medium (CVSS 5.5) Improper Locking vulnerability in canonical ubuntu_linux. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 44.1% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 21 · Related 19Timeline
- 09-05-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.52%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.52% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (lkml.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu46 products
- linux< 4.4.0-187.217 | < 4.15.0-115.116 | < 5.4.0-45.49
- linux-aws< 4.4.0-1076.80 | < 4.4.0-1112.124 | < 4.15.0-1080.84 | < 5.4.0-1022.22
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3< 5.3.0-1033.35
- linux-aws-5.4< 5.4.0-1022.22~18.04.1
Netapp19 products
Debian2 products
- linux< 5.7.6-1
- debian_linuxEOL9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 20.04
Linux1 product
- linux_kernel≤ 5.6.11
Opensuse1 product
- leapEOL15.1 | 15.2
Oracle1 product
- sd-wan_edge8.2
7 vendors · 71 products
References
24 links- lists.opensuse.org/opensuse-security-announce/2020-07/msg00071.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
lists.debian.org/debian-lts-announce/2020/08/msg00019.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlMailing ListX Refsource MLISTThird Party Advisory
Show all 24 references
- git.kernel.org/pub/…REPORT
