In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-988851 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    powerpc/32: Fix hardlockup on vmap stack overflow

    Since the commit c118c7303ad5 (powerpc/32: Fix vmap stack - Do not     activate MMU before reading task struct) a vmap stack overflow     results in a hard lockup. This is because emergency_ctx is still     addressed with its virtual address allthough data MMU is not active     anymore at that time.

    Fix it by using a physical address instead.

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-2025-987246 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    powerpc/32: Fix hardlockup on vmap stack overflow

    Since the commit c118c7303ad5 (powerpc/32: Fix vmap stack - Do not     activate MMU before reading task struct) a vmap stack overflow     results in a hard lockup. This is because emergency_ctx is still     addressed with its virtual address allthough data MMU is not active     anymore at that time.

    Fix it by using a physical address instead.

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.

  - In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap     stack overflow Since the commit c118c7303ad5 (powerpc/32: Fix vmap stack - Do not activate MMU before     reading task struct) a vmap stack overflow results in a hard lockup. This is because emergency_ctx is     still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by     using a physical address instead. (CVE-2021-47567)

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

An update of the linux package has been released.

ID	Name	Product	Family	Severity
272905	Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988851)	Nessus	Unity Linux Local Security Checks	medium
269168	Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987246)	Nessus	Unity Linux Local Security Checks	medium
247444	Linux Distros Unpatched Vulnerability : CVE-2021-47567	Nessus	Misc.	high
151965	Photon OS 4.0: Linux PHSA-2021-4.0-0065	Nessus	PhotonOS Local Security Checks	high

Detections

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CVE-2021-47567

medium

Tenable Plugins

medium

medium

high

high