CVE-2020-25641: canonical ubuntu_linux Loop with Unreachable Exit Condition
Vulnerability summary
CVE-2020-25641 is a medium (CVSS 5.5) Loop with Unreachable Exit Condition vulnerability in canonical ubuntu_linux. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 32.6% of scored vulnerabilities.
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 24 · Related 19Timeline
- 06-10-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · Red hatEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- 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
0.39%
Chance of exploitation in the next 30 days
Percentile
33%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.39% 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, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat55 products
- enterprise_linuxEOL7.0 | 8.0
- bpftool< 0:4.18.0-147.34.1.el8_1 | < 0:4.18.0-193.40.1.el8_2
- bpftool-debuginfo< 0:4.18.0-147.34.1.el8_1 | < 0:4.18.0-193.40.1.el8_2
- kernel< 0:4.14.0-115.33.1.el7a | < 0:4.18.0-147.34.1.el8_1 | < 0:4.18.0-193.40.1.el8_2
- kernel-abi-whitelists< 0:4.14.0-115.33.1.el7a | < 0:4.18.0-147.34.1.el8_1 | < 0:4.18.0-193.40.1.el8_2
Ubuntu42 products
- linux< 4.15.0-126.129 | < 5.4.0-51.56
- linux-aws< 4.15.0-1088.93 | < 5.4.0-1028.29
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1028.29~18.04.1
Debian2 products
- linux< 5.8.10-1
- debian_linuxEOL9.0
Canonical1 product
- ubuntu_linuxEOL18.04 | 20.04
Linux1 product
- linux_kernel≤ 5.8.13 | 5.9.0 | 5.9.0:rc1 | 5.9.0:rc2 | 5.9.0:rc3 | 5.9.0:rc4 | 5.9.0:rc5 | 5.9.0:rc6
Opensuse1 product
- leapEOL15.1 | 15.2
6 vendors · 102 products
References
27 links- bugzilla.redhat.com/show_bug.cgi?id=1881424X Refsource MISCREPORTIssue TrackingPatchThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.htmlVendor AdvisoryX Refsource SUSEMailing ListThird 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
