In the Linux kernel, the following vulnerability has been resolved: nfsd: fix refcount leak in nfsd_set_fh_dentry() nfsd exports a "pseudo root filesystem" which is used by NFSv4 to find the various exported filesystems using LOOKUP requests from a known root filehandle. NFSv3 uses the MOUNT protocol to find those exported filesystems and so is not given access to the pseudo root filesystem. If a v3 (or v2) client uses a filehandle from that filesystem, nfsd_set_fh_dentry() will report an error, but still stores the export in "struct svc_fh" even though it also drops the reference (exp_put()). This means that when fh_put() is called an extra reference will be dropped which can lead to use-after-free and possible denial of service. Normal NFS usage will not provide a pseudo-root filehandle to a v3 client. This bug can only be triggered by the client synthesising an incorrect filehandle. To fix this we move the assignments to the svc_fh later, after all possible error cases have been detected.

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:20097-1 advisory.

    This update for the SUSE Linux Enterprise kernel 6.12.0-160000.7.1 fixes one security issue

    The following security issue was fixed:

    - CVE-2025-40212: nfsd: fix refcount leak in nfsd_set_fh_dentry() (bsc#1254196).

Tenable has extracted the preceding description block directly from the SUSE 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 remote Oracle Linux 10 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-50006 advisory.

    - xfrm: delete x->tunnel as we delete x (Sabrina Dubroca)   {CVE-2025-40215}

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

Note that Nessus has not tested for these issues 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.

  - nfsd: fix refcount leak in nfsd_set_fh_dentry() nfsd exports a pseudo root filesystem which is used by     NFSv4 to find the various exported filesystems using LOOKUP requests from a known root filehandle. NFSv3     uses the MOUNT protocol to find those exported filesystems and so is not given access to the pseudo root     filesystem. If a v3 (or v2) client uses a filehandle from that filesystem, nfsd_set_fh_dentry() will     report an error, but still stores the export in struct svc_fh even though it also drops the reference     (exp_put()). This means that when fh_put() is called an extra reference will be dropped which can lead to     use-after-free and possible denial of service. Normal NFS usage will not provide a pseudo-root filehandle     to a v3 client. This bug can only be triggered by the client synthesising an incorrect filehandle. To fix     this we move the assignments to the svc_fh later, after all possible error cases have been detected.
    (CVE-2025-40212)

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

ID	Name	Product	Family	Severity
296571	openSUSE 16 Security Update : kernel (Live Patch 2 for SUSE Linux Enterprise 16) (openSUSE-SU-2026:20097-1)	Nessus	SuSE Local Security Checks	high
284515	Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50006)	Nessus	Oracle Linux Local Security Checks	high
276664	Linux Distros Unpatched Vulnerability : CVE-2025-40212	Nessus	Misc.	high

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