In the Linux kernel, the following vulnerability has been resolved: mm/mm_init: deferred_grow_zone(): fix out-of-range first_deferred_pfn With CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, deferred_grow_zone() initializes struct pages early in boot to satisfy an allocation. With a large CMA reservation in place, the ranges deferred_init_memmap() finds may not add up to the allocation it was asked for, and the function ends up initializing the memory map of the entire zone and still falls short. That is fine in itself: the function accounts for it and leaves the caller to decide whether it now has enough memory. However, the update of pgdat->first_deferred_pfn that tracks where uninitialized memory map starts could overflow. If the node's RAM end is not aligned on PAGES_PER_SECTION boundaries and some deferred struct pages were initialized, pgdat->first_deferred_pfn would point past the end of the node's memory. deferred_init_memmap() later picks up from pgdat->first_deferred_pfn and hits a BUG_ON(), because it expects a pfn within its node. For example, when running a kernel with CONFIG_DEFERRED_STRUCT_PAGE_INIT=y and CONFIG_CMA=y using the following qemu command line qemu-system-x86_64 -enable-kvm -m 8032M -kernel bzImage \ -append "nokaslr cma=4768M@0x100000000" the kernel panics: kernel BUG at mm/mm_init.c:2131! CPU: 3 UID: 0 PID: 36 Comm: pgdatinit0 Not tainted 7.2.0-rc6 #1 RIP: 0010:deferred_init_memmap+0x1b8/0x1c0 RAX: 0000000000236000 R13: 0000000000238000 Call Trace: kthread+0xdf/0x120 ret_from_fork+0x187/0x250 Make sure that the update of pgdta->first_deferred_pfn does not overflow when the entire zone's (and therefore node's) memory map is initialized. [rppt: massaged the changelog]

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - In the Linux kernel, the following vulnerability has been resolved: mm/mm_init: deferred_grow_zone(): fix
    out-of-range first_deferred_pfn With CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, deferred_grow_zone()
    initializes struct pages early in boot to satisfy an allocation. With a large CMA reservation in place,
    the ranges deferred_init_memmap() finds may not add up to the allocation it was asked for, and the
    function ends up initializing the memory map of the entire zone and still falls short. That is fine in
    itself: the function accounts for it and leaves the caller to decide whether it now has enough memory.
    However, the update of pgdat->first_deferred_pfn that tracks where uninitialized memory map starts could
    overflow. If the node's RAM end is not aligned on PAGES_PER_SECTION boundaries and some deferred struct
    pages were initialized, pgdat->first_deferred_pfn would point past the end of the node's memory.
    deferred_init_memmap() later picks up from pgdat->first_deferred_pfn and hits a BUG_ON(), because it
    expects a pfn within its node. For example, when running a kernel with CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
    and CONFIG_CMA=y using the following qemu command line qemu-system-x86_64 -enable-kvm -m 8032M -kernel
    bzImage \ -append "nokaslr cma=4768M@0x100000000" the kernel panics: kernel BUG at mm/mm_init.c:2131! CPU:
    3 UID: 0 PID: 36 Comm: pgdatinit0 Not tainted 7.2.0-rc6 #1 RIP: 0010:deferred_init_memmap+0x1b8/0x1c0 RAX:
    0000000000236000 R13: 0000000000238000 Call Trace: kthread+0xdf/0x120 ret_from_fork+0x187/0x250 Make sure
    that the update of pgdta->first_deferred_pfn does not overflow when the entire zone's (and therefore
    node's) memory map is initialized. [rppt: massaged the changelog] (CVE-2026-93227)

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

  - mm/mm_init: deferred_grow_zone(): fix out-of-range first_deferred_pfn With     CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled, deferred_grow_zone() initializes struct pages early in boot to     satisfy an allocation. With a large CMA reservation in place, the ranges deferred_init_memmap() finds may     not add up to the allocation it was asked for, and the function ends up initializing the memory map of the     entire zone and still falls short. That is fine in itself: the function accounts for it and leaves the     caller to decide whether it now has enough memory. However, the update of pgdat->first_deferred_pfn that     tracks where uninitialized memory map starts could overflow. If the node's RAM end is not aligned on     PAGES_PER_SECTION boundaries and some deferred struct pages were initialized, pgdat->first_deferred_pfn     would point past the end of the node's memory. deferred_init_memmap() later picks up from     pgdat->first_deferred_pfn and hits a BUG_ON(), because it expects a pfn within its node. For example, when     running a kernel with CONFIG_DEFERRED_STRUCT_PAGE_INIT=y and CONFIG_CMA=y using the following qemu command     line qemu-system-x86_64 -enable-kvm -m 8032M -kernel bzImage \ -append nokaslr cma=4768M@0x100000000 the     kernel panics: kernel BUG at mm/mm_init.c:2131! CPU: 3 UID: 0 PID: 36 Comm: pgdatinit0 Not tainted     7.2.0-rc6 #1 RIP: 0010:deferred_init_memmap+0x1b8/0x1c0 RAX: 0000000000236000 R13: 0000000000238000 Call     Trace: kthread+0xdf/0x120 ret_from_fork+0x187/0x250 Make sure that the update of pgdta->first_deferred_pfn     does not overflow when the entire zone's (and therefore node's) memory map is initialized. [rppt: massaged     the changelog] (CVE-2026-93227)

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

ID	Name	Product	Family	Type	Severity
475318	Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.106	Tenable Cloud Security	Google COS Security Checks	Local	high
475318	Google: sys-kernel/cchost-kernel-6_18, sys-kernel/csql-kernel-6_18, sys-kernel/lakitu-kernel-6_18, sys-kernel/lakitu-nc-kernel-6_18: security update to 19999.44.106	Tenable Self-Hosted Container Security	Google COS Security Checks	Local	high
365283	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-3187)	Nessus	Amazon Linux Local Security Checks	Local	medium
350227	Linux Distros Unpatched Vulnerability : CVE-2026-93227	Nessus	Misc.	Local	high

Detections

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CVE-2026-93227

high

Tenable Plugins

high

high

medium

high