The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-987141 advisory.

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

    powerpc/kasan: Fix early region not updated correctly

    The shadow's page table is not updated when PTE_RPN_SHIFT is 24     and PAGE_SHIFT is 12. It not only causes false positives but     also false negative as shown the following text.

    Fix it by bringing the logic of kasan_early_shadow_page_entry here.

    1. False Positive:
    ==================================================================     BUG: KASAN: vmalloc-out-of-bounds in pcpu_alloc+0x508/0xa50     Write of size 16 at addr f57f3be0 by task swapper/0/1

    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.15.0-12267-gdebe436e77c7 #1     Call Trace:
    [c80d1c20] [c07fe7b8] dump_stack_lvl+0x4c/0x6c (unreliable)     [c80d1c40] [c02ff668] print_address_description.constprop.0+0x88/0x300     [c80d1c70] [c02ff45c] kasan_report+0x1ec/0x200     [c80d1cb0] [c0300b20] kasan_check_range+0x160/0x2f0     [c80d1cc0] [c03018a4] memset+0x34/0x90     [c80d1ce0] [c0280108] pcpu_alloc+0x508/0xa50     [c80d1d40] [c02fd7bc] __kmem_cache_create+0xfc/0x570     [c80d1d70] [c0283d64] kmem_cache_create_usercopy+0x274/0x3e0     [c80d1db0] [c2036580] init_sd+0xc4/0x1d0     [c80d1de0] [c00044a0] do_one_initcall+0xc0/0x33c     [c80d1eb0] [c2001624] kernel_init_freeable+0x2c8/0x384     [c80d1ef0] [c0004b14] kernel_init+0x24/0x170     [c80d1f10] [c001b26c] ret_from_kernel_thread+0x5c/0x64

    Memory state around the buggy address:
     f57f3a80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8      f57f3b00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8     >f57f3b80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8                                                    ^      f57f3c00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8      f57f3c80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8     ==================================================================

    2. False Negative (with KASAN tests):
    ==================================================================     Before fix:
        ok 45 - kmalloc_double_kzfree         # vmalloc_oob: EXPECTATION FAILED at lib/test_kasan.c:1039         KASAN failure expected in ((volatile char *)area)[3100], but none occurred         not ok 46 - vmalloc_oob         not ok 1 - kasan

    ==================================================================     After fix:
        ok 1 - kasan

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.

  - In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Fix early region not     updated correctly The shadow's page table is not updated when PTE_RPN_SHIFT is 24 and PAGE_SHIFT is 12. It     not only causes false positives but also false negative as shown the following text. Fix it by bringing     the logic of kasan_early_shadow_page_entry here. 1. False Positive:
    ================================================================== BUG: KASAN: vmalloc-out-of-bounds in     pcpu_alloc+0x508/0xa50 Write of size 16 at addr f57f3be0 by task swapper/0/1 CPU: 0 PID: 1 Comm: swapper/0     Not tainted 5.15.0-12267-gdebe436e77c7 #1 Call Trace: [c80d1c20] [c07fe7b8] dump_stack_lvl+0x4c/0x6c     (unreliable) [c80d1c40] [c02ff668] print_address_description.constprop.0+0x88/0x300 [c80d1c70] [c02ff45c]     kasan_report+0x1ec/0x200 [c80d1cb0] [c0300b20] kasan_check_range+0x160/0x2f0 [c80d1cc0] [c03018a4]     memset+0x34/0x90 [c80d1ce0] [c0280108] pcpu_alloc+0x508/0xa50 [c80d1d40] [c02fd7bc]
    __kmem_cache_create+0xfc/0x570 [c80d1d70] [c0283d64] kmem_cache_create_usercopy+0x274/0x3e0 [c80d1db0]     [c2036580] init_sd+0xc4/0x1d0 [c80d1de0] [c00044a0] do_one_initcall+0xc0/0x33c [c80d1eb0] [c2001624]     kernel_init_freeable+0x2c8/0x384 [c80d1ef0] [c0004b14] kernel_init+0x24/0x170 [c80d1f10] [c001b26c]     ret_from_kernel_thread+0x5c/0x64 Memory state around the buggy address: f57f3a80: f8 f8 f8 f8 f8 f8 f8 f8     f8 f8 f8 f8 f8 f8 f8 f8 f57f3b00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >f57f3b80: f8 f8 f8 f8     f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ f57f3c00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f57f3c80:
    f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8     ================================================================== 2. False Negative (with KASAN tests):
    ================================================================== Before fix: ok 45 -     kmalloc_double_kzfree # vmalloc_oob: EXPECTATION FAILED at lib/test_kasan.c:1039 KASAN failure expected in     ((volatile char *)area)[3100], but none occurred not ok 46 - vmalloc_oob not ok 1 - kasan     ================================================================== After fix: ok 1 - kasan     (CVE-2021-47640)

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-989003 advisory.

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

    powerpc/kasan: Fix early region not updated correctly

    The shadow's page table is not updated when PTE_RPN_SHIFT is 24     and PAGE_SHIFT is 12. It not only causes false positives but     also false negative as shown the following text.

    Fix it by bringing the logic of kasan_early_shadow_page_entry here.

    1. False Positive:
    ==================================================================     BUG: KASAN: vmalloc-out-of-bounds in pcpu_alloc+0x508/0xa50     Write of size 16 at addr f57f3be0 by task swapper/0/1

    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.15.0-12267-gdebe436e77c7 #1     Call Trace:
    [c80d1c20] [c07fe7b8] dump_stack_lvl+0x4c/0x6c (unreliable)     [c80d1c40] [c02ff668] print_address_description.constprop.0+0x88/0x300     [c80d1c70] [c02ff45c] kasan_report+0x1ec/0x200     [c80d1cb0] [c0300b20] kasan_check_range+0x160/0x2f0     [c80d1cc0] [c03018a4] memset+0x34/0x90     [c80d1ce0] [c0280108] pcpu_alloc+0x508/0xa50     [c80d1d40] [c02fd7bc] __kmem_cache_create+0xfc/0x570     [c80d1d70] [c0283d64] kmem_cache_create_usercopy+0x274/0x3e0     [c80d1db0] [c2036580] init_sd+0xc4/0x1d0     [c80d1de0] [c00044a0] do_one_initcall+0xc0/0x33c     [c80d1eb0] [c2001624] kernel_init_freeable+0x2c8/0x384     [c80d1ef0] [c0004b14] kernel_init+0x24/0x170     [c80d1f10] [c001b26c] ret_from_kernel_thread+0x5c/0x64

    Memory state around the buggy address:
     f57f3a80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8      f57f3b00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8     >f57f3b80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8                                                    ^      f57f3c00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8      f57f3c80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8     ==================================================================

    2. False Negative (with KASAN tests):
    ==================================================================     Before fix:
        ok 45 - kmalloc_double_kzfree         # vmalloc_oob: EXPECTATION FAILED at lib/test_kasan.c:1039         KASAN failure expected in ((volatile char *)area)[3100], but none occurred         not ok 46 - vmalloc_oob         not ok 1 - kasan

    ==================================================================     After fix:
        ok 1 - kasan

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.

ID	Name	Product	Family	Published	Updated	Severity
268680	Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987141)	Nessus	Unity Linux Local Security Checks	10/7/2025	10/15/2025	high
151965	Photon OS 4.0: Linux PHSA-2021-4.0-0065	Nessus	PhotonOS Local Security Checks	7/22/2021	3/23/2026	high
230100	Linux Distros Unpatched Vulnerability : CVE-2021-47640	Nessus	Misc.	3/5/2025	1/14/2026	high
273283	Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989003)	Nessus	Unity Linux Local Security Checks	11/5/2025	11/5/2025	high

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