CVE-2021-34938.8HighCWE-270

CVE-2021-3493: Ubuntu linux kernel vulnerability

Ubuntu · linux kernel

Vendor fix available · Affected: Ubuntu linux kernel · Exploitation: in CISA KEV since 20 Oct 2022

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

ExploitationIn CISA KEV

In CISA KEVCISA KEV catalogue20 Oct 2022
Exploited (reported): not seen
Scanning observed: not seen
Proof of concept public: not seen
Not established: not seen

49.2%probability of exploitation in the next 30 days

98th percentile

050100

Higher than 98% of scored CVEs

8.8HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Ubuntu · linux kernelfrom 5.8 kernel before 5.8.0-50.56; from 5.4 kernel before 5.4.0-72.80; from 4.15 kernel before 4.15.0-142.146; from 4.4 kernel before 4.4.0-209.241

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalogue.
CISA KEV: Listed since 20 Oct 2022 · catalogue entry
Public check: No public nuclei template
Weakness: Privilege Context Switching Error · Access Control
Vendor: Ubuntu
Published: April 2021
Band: Exploited in the wild, April 2021

What changed

20 Oct 2022
CISA added it to the KEV catalogue CISA

CoverageNo articles yet

No CyberSIXT article names CVE-2021-3493 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.