5.5

CVE-2020-11935: aufs: improperly managed inode reference counts in the vfsub_dentry_open() method

Modified
AliasesLSN-0070-1UBUNTU-CVE-2020-11935
Published 07-04-2023Last modified 04-08-2024

Vulnerability summary

CVE-2020-11935 is a medium (CVSS 5.5) Improper Update of Reference Count vulnerability in canonical ubuntu_linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.4, 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
0.20%
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

Advisory lineage

Upstream 0 · Downstream 6 · Related 5
LSN-0072-1USN-4425-1USN-4426-1USN-4427-1USN-4439-1USN-4440-1

Timeline

  1. 07-04-2023
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.20% 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

Affected systems

Version check

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

Ubuntu168 products
  • linux< 4.4.0-186.216 | < 4.15.0-112.113 | < 5.4.0-42.46 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1111.123 | < 4.15.0-1079.83 | < 5.4.0-1020.20 | < 4.4.0-1075.79 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Canonical1 product
Debian1 product

3 vendors · 170 products

References

10 links