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.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-004478 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003841 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2021-20226)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
290179	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-004478)	Nessus	Unity Linux Local Security Checks	high
288520	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-003841)	Nessus	Unity Linux Local Security Checks	high
248323	Linux Distros Unpatched Vulnerability : CVE-2021-20226	Nessus	Misc.	high

Detections

Analytics

CVE-2021-20226

high

Tenable Plugins

high

high

high