What’s Vulnerable › Vulnerabilities

CVE-2021-3428

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-04 · updated 2026-06-17
• Weakness: CWE-190

Description

A flaw was found in the Linux kernel. A denial of service problem is identified if an extent tree is corrupted in a crafted ext4 filesystem in fs/ext4/extents.c in ext4_es_cache_extent. Fabricating an integer overflow, A local attacker with a special user privilege may cause a system crash problem which can lead to an availability threat.

Affected products

• Linux kernel: before 5.9.0 — fixed in 5.9.0

How to fix

Upgrade to a fixed version: Linux kernel 5.9.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1972621
• https://ubuntu.com/security/CVE-2021-3428
• https://www.openwall.com/lists/oss-security/2021/03/17/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1972621
• https://ubuntu.com/security/CVE-2021-3428
• https://www.openwall.com/lists/oss-security/2021/03/17/1

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