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CVE-2021-3428

20
FAUCET Score

CVE-2021-3428 describes a denial-of-service vulnerability in the Linux kernel, specifically within the ext4 filesystem's extent tree handling. A local attacker with special user privileges can exploit an integer overflow by crafting a malicious ext4 filesystem, leading to a system crash and an availability threat. Rated Medium with a CVSS score of 5.5, this vulnerability requires local access and low privileges, but has a high impact on availability. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.9.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
22.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 79th percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-305.rt7.72.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-305.el8
View patch

Vendor Advisories (1)

redhatCVE-2021-3428Moderate

kernel: integer overflow in ext4_es_cache_extent

Jan 24, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPermissions RequiredThird Party Advisory
ubuntu.com / security/CVE-2021-3428
Third Party Advisory
openwall.com / lists/oss-security/2021/03/17/1
Mailing ListThird Party Advisory