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

  - x86/efi: Fix graceful fault handling after FPU softirq changes Since commit d02198550423 (x86/fpu:
    Improve crypto performance by making kernel-mode FPU reliably usable in softirqs), kernel_fpu_begin()     calls fpregs_lock() which uses local_bh_disable() instead of the previous preempt_disable(). This sets     SOFTIRQ_OFFSET in preempt_count during the entire EFI runtime service call, causing in_interrupt() to     return true in normal task context. The graceful page fault handler efi_crash_gracefully_on_page_fault()     uses in_interrupt() to bail out for faults in real interrupt context. With SOFTIRQ_OFFSET now set, the     handler always bails out, leaving EFI firmware page faults unhandled. This escalates to die() which also     sees in_interrupt() as true and calls panic(Fatal exception in interrupt), resulting in a hard system     freeze. On systems with buggy firmware that triggers page faults during EFI runtime calls (e.g., accessing     unmapped memory in GetTime()), this causes an unrecoverable hang instead of the expected graceful     EFI_ABORTED recovery. Fix by replacing in_interrupt() with !in_task(). This preserves the original intent     of bailing for interrupts or NMI faults, while no longer falsely triggering from the FPU code path's     local_bh_disable(). [ardb: Sashiko spotted that using 'in_hardirq() || in_nmi()' leaves a window where a     softirq may be taken before fpregs_lock() is called, but after efi_rts_work.efi_rts_id has been assigned,     and any page faults occurring in that window will then be misidentified as having been caused by the     firmware. Instead, use !in_task(), which incorporates in_serving_softirq(). ] (CVE-2026-46290)

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

The remote Ubuntu 24.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8491-1 advisory.

    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:

    - ARM64 architecture;

    - x86 architecture;

    - Block layer subsystem;

    - Cryptographic API;

    - DMA engine subsystem;

    - InfiniBand drivers;

    - STMicroelectronics network drivers;

    - Network drivers;

    - NVME drivers;

    - SCSI subsystem;

    - USB over IP driver;

    - File systems infrastructure;

    - Ext4 file system;

    - Network file system (NFS) server daemon;

    - SMB network file system;

    - Kernel thread helper (kthread);

    - IPv6 networking;

    - Tracing infrastructure;

    - Kernel exit() syscall;

    - Scatterlist API;

    - B.A.T.M.A.N. meshing protocol;

    - Ethernet bridge;

    - Ceph Core library;

    - IPv4 networking;

    - Multipath TCP;

    - Netfilter;

    - RxRPC session sockets;

    - SMC sockets;

    - X.25 network layer; (CVE-2026-22984, CVE-2026-23272, CVE-2026-23278, CVE-2026-23392, CVE-2026-23427,     CVE-2026-23428, CVE-2026-23450, CVE-2026-23455, CVE-2026-31402, CVE-2026-31418, CVE-2026-31436,     CVE-2026-31448, CVE-2026-31478, CVE-2026-31607, CVE-2026-31635, CVE-2026-31637, CVE-2026-31649,     CVE-2026-31657, CVE-2026-31659, CVE-2026-31668, CVE-2026-31669, CVE-2026-31682, CVE-2026-31685,     CVE-2026-31718, CVE-2026-43011, CVE-2026-43037, CVE-2026-43038, CVE-2026-43071, CVE-2026-43083,     CVE-2026-43114, CVE-2026-43117, CVE-2026-43125, CVE-2026-43186, CVE-2026-43197, CVE-2026-43304,     CVE-2026-43341, CVE-2026-43376, CVE-2026-43378, CVE-2026-43383, CVE-2026-43384, CVE-2026-43402,     CVE-2026-43406, CVE-2026-43407, CVE-2026-43414, CVE-2026-43493, CVE-2026-43501, CVE-2026-45898,     CVE-2026-45988, CVE-2026-46039, CVE-2026-46043, CVE-2026-46115, CVE-2026-46119, CVE-2026-46135,     CVE-2026-46185, CVE-2026-46195, CVE-2026-46243, CVE-2026-46244, CVE-2026-46266, CVE-2026-46289,     CVE-2026-46290, CVE-2026-46316, CVE-2026-46325)

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	Published	Updated	Severity
320310	Linux Distros Unpatched Vulnerability : CVE-2026-46290	Nessus	Misc.	6/10/2026	7/31/2026	medium
325015	Ubuntu 24.04 LTS : Linux kernel (OEM) vulnerabilities (USN-8491-1)	Nessus	Ubuntu Local Security Checks	7/3/2026	7/30/2026	high
316975	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1754)	Nessus	Amazon Linux Local Security Checks	5/27/2026	7/31/2026	high

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