CVE-2020-11565: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2020-11565 is a medium (CVSS 6.0) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 44% of scored vulnerabilities.
Not severe (CVSS 6, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 16 · Related 5Timeline
- 06-04-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in the Linux kernel through 5.6.2. mpol_parse_str in mm/mempolicy.c has a stack-based out-of-bounds write because an empty nodelist is mishandled during mount option parsing, aka CID-aa9f7d5172fa. NOTE: Someone in the security community disagrees that this is a vulnerability because the issue “is a bug in parsing mount options which can only be specified by a privileged user, so triggering the bug does not grant any powers not already held.”
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.0MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
- OSV · DebianEcosystem advisory · calculated6.0MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/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
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu39 products
- linuxAll versions (No fix recorded) | < 4.4.0-179.209 | < 4.15.0-101.102 | < 5.4.0-31.35
- linux-aws< 4.4.0-1067.71 | < 4.4.0-1107.118 | < 4.15.0-1067.71 | < 5.4.0-1011.11
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3< 5.3.0-1019.21~18.04.1
- linux-aws-fips< 4.15.0-2018.18 | All versions (No fix recorded)
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 20.04
Debian1 product
- linux< 5.5.17-1
Linux1 product
- linux_kernel≤ 5.6.2
4 vendors · 42 products
References
22 links- github.com/torvalds/linux/commit/aa9f7d5172fac9bf1f09e678c35e287a40a7b7ddX Refsource MISCREPORTPatchThird Party Advisory
