An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-004466 advisory.

    An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the     files_struct of the process that submitted a request, causing execve() to incorrectly optimize     unshare_fd(), aka CID-0f2122045b94.

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-2026-003993 advisory.

    An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the     files_struct of the process that submitted a request, causing execve() to incorrectly optimize     unshare_fd(), aka CID-0f2122045b94.

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.

  - An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the     files_struct of the process that submitted a request, causing execve() to incorrectly optimize     unshare_fd(), aka CID-0f2122045b94. (CVE-2020-29534)

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

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4678-1 advisory.

    It was discovered that the AMD Running Average Power Limit (RAPL) driver in the Linux kernel did not     properly restrict access to power data. A local attacker could possibly use this to expose sensitive     information. (CVE-2020-12912)

    Jann Horn discovered that the io_uring subsystem in the Linux kernel did not properly perform reference     counting in some situations. A local attacker could use this to expose sensitive information or possibly     escalate privileges. (CVE-2020-29534)

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

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

ID	Name	Product	Family	Severity
290244	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-004466)	Nessus	Unity Linux Local Security Checks	high
288497	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-003993)	Nessus	Unity Linux Local Security Checks	high
253740	Linux Distros Unpatched Vulnerability : CVE-2020-29534	Nessus	Misc.	high
144751	Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-4678-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2020-29534

high

Tenable Plugins

high

high

high

high