In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg() nfsd4_add_rdaccess_to_wrdeleg() unconditionally overwrites fp->fi_fds[O_RDONLY] with a newly acquired nfsd_file. However, if the client already has a SHARE_ACCESS_READ open from a previous OPEN operation, this action overwrites the existing pointer without releasing its reference, orphaning the previous reference. Additionally, the function originally stored the same nfsd_file pointer in both fp->fi_fds[O_RDONLY] and fp->fi_rdeleg_file with only a single reference. When put_deleg_file() runs, it clears fi_rdeleg_file and calls nfs4_file_put_access() to release the file. However, nfs4_file_put_access() only releases fi_fds[O_RDONLY] when the fi_access[O_RDONLY] counter drops to zero. If another READ open exists on the file, the counter remains elevated and the nfsd_file reference from the delegation is never released. This potentially causes open conflicts on that file. Then, on server shutdown, these leaks cause __nfsd_file_cache_purge() to encounter files with an elevated reference count that cannot be cleaned up, ultimately triggering a BUG() in kmem_cache_destroy() because there are still nfsd_file objects allocated in that cache.

The remote Ubuntu 24.04 LTS / 25.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8374-1 advisory.

    It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic     operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or     possibly escape a container. (CVE-2026-31431)

    It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer     operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in     the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to     escalate privileges, or possibly escape a container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998,     CVE-2026-46000)

    It was discovered that a logic flaw existed in the XFRM ESP-in-TCP subsystem in the Linux kernel when     handling socket buffer fragments. This flaw is known as Fragnesia. A local attacker could use this to     escalate privileges, or possibly escape a container. (CVE-2026-43503, CVE-2026-46300)

    Qualys discovered that a race condition existed in the ptrace subsystem of the Linux kernel when     privileged processes are exiting. An unprivileged local attacker could use this issue to expose sensitive     information. (CVE-2026-46333)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a memory leak when handling     AppArmor notifications. A local attacker could use this to cause resource exhaustion. (CVE-2026-47326)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contain a NULL pointer dereference     when handling AppArmor notifications. A local attacker could use this to cause a kernel oops.
    (CVE-2026-47327)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an invalid free when     handling AppArmor notifications. A local attacker could use this to corrupt kernel memory.
    (CVE-2026-47328)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained insufficient validation of     AppArmor notification responses. A local attacker could use this to allow crafted responses to be     processed. (CVE-2026-47329)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used an uninitialized variable when     handling AppArmor notifications. A local attacker could use this to cause incorrect caching of data.
    (CVE-2026-47330)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained an out-of-bounds (OOB) read     when handling AppArmor notifications. A local attacker could use this to cause information disclosure of     kernel memory. (CVE-2026-47332)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a out-of-bounds (OOB) read     when handling AppArmor notifications. A local attacker could use this to cause kernel memory corruption     and, theoretically, influence processing of AppArmor policies. (CVE-2026-47333)

    Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained incorrect holding of locks     when handling AppArmor notifications. A local attacker could use this to cause a kernel panic or deadlock.
    (CVE-2026-47334)

    Tristan Madani and Trevor Lawrence have each independently discovered that Ubuntu Linux kernel 6.8, 6.17     and 7.0 contained a NULL pointer dereference when handling AppArmor network socket mediation. A local     attacker could use this to cause a kernel oops. (CVE-2026-47337)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - S390 architecture;

    - Cryptographic API;

    - GPU drivers;

    - Ethernet bonding driver;

    - Network file system (NFS) server daemon;

    - Distributed Switch Architecture;

    - Netfilter;

    - Control group (cgroup);

    - Kernel kexec() syscall;

    - Memory management;

    - MAC80211 subsystem;

    - Multipath TCP;

    - Packet sockets;

    - RDS protocol;

    - RxRPC session sockets;

    - TLS protocol;

    - Unix domain sockets;

    - AppArmor security module; (CVE-2025-71088, CVE-2025-71090, CVE-2025-71127, CVE-2025-71134,     CVE-2025-71139, CVE-2025-71141, CVE-2025-71142, CVE-2025-71144, CVE-2025-71152, CVE-2025-71155,     CVE-2026-23274, CVE-2026-23351, CVE-2026-23394, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533,     CVE-2026-31676, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-43494, CVE-2026-45966,     CVE-2026-46028)

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.

The remote Ubuntu 24.04 LTS / 25.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8310-1 advisory.

    It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic     operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or     possibly escape a container. (CVE-2026-31431)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - S390 architecture;

    - Cryptographic API;

    - GPU drivers;

    - Ethernet bonding driver;

    - Microsoft Azure Network Adapter (MANA) driver;

    - Network file system (NFS) server daemon;

    - Distributed Switch Architecture;

    - Netfilter;

    - Control group (cgroup);

    - Kernel kexec() syscall;

    - Memory management;

    - MAC80211 subsystem;

    - Multipath TCP;

    - Packet sockets;

    - TLS protocol;

    - Unix domain sockets; (CVE-2025-71088, CVE-2025-71090, CVE-2025-71127, CVE-2025-71134, CVE-2025-71139,     CVE-2025-71141, CVE-2025-71142, CVE-2025-71144, CVE-2025-71152, CVE-2025-71155, CVE-2026-23274,     CVE-2026-23351, CVE-2026-23394, CVE-2026-23454, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533,     CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-43276)

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.

The remote Ubuntu 25.10 / Pro Realtime 24.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8277-1 advisory.

    It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic     operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or     possibly escape a container. (CVE-2026-31431)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - S390 architecture;

    - Cryptographic API;

    - GPU drivers;

    - Ethernet bonding driver;

    - Network file system (NFS) server daemon;

    - Distributed Switch Architecture;

    - Netfilter;

    - Control group (cgroup);

    - Kernel kexec() syscall;

    - Memory management;

    - MAC80211 subsystem;

    - Multipath TCP;

    - Packet sockets;

    - TLS protocol;

    - Unix domain sockets; (CVE-2025-71088, CVE-2025-71090, CVE-2025-71127, CVE-2025-71134, CVE-2025-71139,     CVE-2025-71141, CVE-2025-71142, CVE-2025-71144, CVE-2025-71152, CVE-2025-71155, CVE-2026-23274,     CVE-2026-23351, CVE-2026-23394, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033,     CVE-2026-43077, CVE-2026-43078)

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.

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: nfsd: fix nfsd_file reference leak in     nfsd4_add_rdaccess_to_wrdeleg() nfsd4_add_rdaccess_to_wrdeleg() unconditionally overwrites     fp->fi_fds[O_RDONLY] with a newly acquired nfsd_file. However, if the client already has a     SHARE_ACCESS_READ open from a previous OPEN operation, this action overwrites the existing pointer without     releasing its reference, orphaning the previous reference. Additionally, the function originally stored     the same nfsd_file pointer in both fp->fi_fds[O_RDONLY] and fp->fi_rdeleg_file with only a single     reference. When put_deleg_file() runs, it clears fi_rdeleg_file and calls nfs4_file_put_access() to     release the file. However, nfs4_file_put_access() only releases fi_fds[O_RDONLY] when the     fi_access[O_RDONLY] counter drops to zero. If another READ open exists on the file, the counter remains     elevated and the nfsd_file reference from the delegation is never released. This potentially causes open     conflicts on that file. Then, on server shutdown, these leaks cause __nfsd_file_cache_purge() to encounter     files with an elevated reference count that cannot be cleaned up, ultimately triggering a BUG() in     kmem_cache_destroy() because there are still nfsd_file objects allocated in that cache. (CVE-2025-71090)

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

ID	Name	Product	Family	Severity
318635	Ubuntu 24.04 LTS / 25.10 : Linux kernel vulnerabilities (USN-8374-1)	Nessus	Ubuntu Local Security Checks	high
317095	Ubuntu 24.04 LTS / 25.10 : Linux kernel (Azure) vulnerabilities (USN-8310-1)	Nessus	Ubuntu Local Security Checks	high
315742	Ubuntu 25.10 / Pro Realtime 24.04 LTS : Linux kernel vulnerabilities (USN-8277-1)	Nessus	Ubuntu Local Security Checks	high
283652	Linux Distros Unpatched Vulnerability : CVE-2025-71090	Nessus	Misc.	medium

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