In the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc() code really is designed around removing the node from the tree and then freeing it after an RCU grace-period. The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime issues, but the persistent key handling uses a different model. Instead of extending the keyring locking, just do the simple RCU locking that the assoc_array was designed for.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098955 advisory.

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

    security/keys: fix missed RCU read section on lookup

    Nicholas Carlini reports that the keyring code calls assoc_array_find()     in find_key_to_update() without holding the RCU read lock, while the     assoc_array_gc() code really is designed around removing the node from     the tree and then freeing it after an RCU grace-period.

    The regular key handling doesn't see this because holding the keyring     semaphore hides any lifetime issues, but the persistent key handling     uses a different model.

    Instead of extending the keyring locking, just do the simple RCU locking     that the assoc_array was designed for.

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.

An update of the linux package has been released.

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

  - security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls     assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc()     code really is designed around removing the node from the tree and then freeing it after an RCU grace-     period. The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime     issues, but the persistent key handling uses a different model. Instead of extending the keyring locking,     just do the simple RCU locking that the assoc_array was designed for. (CVE-2026-64015)

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

ID	Name	Product	Family	Type	Severity
340681	Ubuntu 24.04 LTS / 26.04 LTS / Pro Realtime 24.04 LTS : Linux kernel (NVIDIA) vulnerabilities (USN-8663-1)	Nessus	Ubuntu Local Security Checks	Local	high
340568	Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098955)	Nessus	Unity Linux Local Security Checks	Local	high
340045	Ubuntu 26.04 LTS : Linux kernel (NVIDIA BaseOS) vulnerabilities (USN-8664-1)	Nessus	Ubuntu Local Security Checks	Local	high
337224	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2026-129 (ALASKERNEL-5.10-2026-129)	Nessus	Amazon Linux Local Security Checks	Local	medium
333944	Photon OS 5.0: Linux PHSA-2026-5.0-92-0864	Nessus	PhotonOS Local Security Checks	Local	high
333941	Photon OS 5.0: Linux PHSA-2026-5.0-92-0926	Nessus	PhotonOS Local Security Checks	Local	high
329326	Photon OS 5.0: Linux PHSA-2026-5.0-0926	Nessus	PhotonOS Local Security Checks	Local	high
327940	Linux Distros Unpatched Vulnerability : CVE-2026-64015	Nessus	Misc.	Local	high
322107	Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1894)	Nessus	Amazon Linux Local Security Checks	Local	high
322088	Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1882)	Nessus	Amazon Linux Local Security Checks	Local	high
322087	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1881)	Nessus	Amazon Linux Local Security Checks	Local	high
318773	Photon OS 5.0: Linux PHSA-2026-5.0-0864	Nessus	PhotonOS Local Security Checks	Local	high

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