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Vulnerability · Published Feb 23, 2021 · Assigned by redhat

CVE-2021-20226

High 7.8

In plain English

A high-severity use-after-free in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.4%top 61.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user privilege could cause a denial of service problem on the system The issue results from the lack of validating the existence of an object prior to performing operations on the object by not incrementing the file reference counter while in use. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.4-1DEBIAN-CVE-2021-20226
Debian:13linux5.10.4-1DEBIAN-CVE-2021-20226
Debian:14linux5.10.4-1DEBIAN-CVE-2021-20226

Affected products (as reported)

VendorProductVersions
n/a kernel kernel 5.10

Weakness: CWE-416

References