4.9

CVE-2020-35513: linux linux_kernel Privilege Dropping / Lowering Errors

Modified
AliasesUBUNTU-CVE-2020-35513DEBIAN-CVE-2020-35513
Published 25-01-2021Last modified 04-08-2024

Vulnerability summary

CVE-2020-35513 is a medium (CVSS 4.9) Privilege Dropping / Lowering Errors vulnerability in linux linux_kernel. EPSS estimates a 1.36% chance of exploitation in the next 30 days, higher than 71.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.9/10
010
Medium · v3.1 (NVD)
EPSS score
1.36%
0%100%
Low · +0.02 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 2
RHSA-2021:0336RHSA-2021:0338

Timeline

  1. 25-01-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A user with access to the NFS could use this flaw to starve the resources causing denial of service.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.36%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 1.35% 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: network-reachable, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu19 products
  • linuxAll versions (No fix recorded) | < 4.15.0-23.25
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1010.10
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.3All versions (No fix recorded)
  • linux-azureAll versions (No fix recorded) | < 4.15.0-1013.13~16.04.2
Debian1 product
  • linux< 4.16.5-1
Linux1 product
Redhat1 product

4 vendors · 22 products

References

6 links