CVE-2020-12655: linux linux_kernel Loop with Unreachable Exit Condition

Modified

AliasesUBUNTU-CVE-2020-12655DEBIAN-CVE-2020-12655

Published 05-05-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-12655 is a medium (CVSS 5.5) Loop with Unreachable Exit Condition vulnerability in linux linux_kernel. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 39.2% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

5.5/10

010

Medium · v3.1 (NVD)

EPSS score

0.45%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

05-05-2020
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.15.5v2.02.1

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.45% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-835Loop with Unreachable Exit ConditionThe product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu45 products

linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-115.116 | < 5.4.0-45.49
linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 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