Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且廠商未提供可用的修補程式。

  - mm/debug_vm_pgtable清除 destroy_args() 處的頁面表格項目 mm/debug_vm_pagetable 測試會為其執行的測試手動配置頁面表格項目同時也會使用其手動配置的 mm_struct。這本身沒有問題但是當其結束時在 destroy_args() 無法使用 *_clear 函式清除這些項目。問題在於 會留下過時項目。如果另一個處理程序以相同位址的 pgd 配置 mm_struct它可能最終進入過時項目。這實際上在具有 CONFIG_DEBUG_VM_PGTABLE=y 的除錯核心上會發生例如這是我新增了一些額外除錯的輸出 (如果 pgtables_bytes 變成負值它會列印警告追踪以及 check_mm() 函式的警告) 2.539353] debug_vm_pgtable: [get_random_vaddr ]: random_vaddr is 0x7ea247140000 [ 2.539366] kmem_cache info [ 2.539374] kmem_cachep 0x000000002ce82385 - freelist 0x0000000000000000 - offset 0x508 [2.539447] debug_vm_pgtable: [init_args ]: args->mm is 0x000000002267cc9e (... ) [ 2.552800] 警告CPU5 PID116@include/linux/mm.h:2841 free_pud_range+0x8bc/0x8d0 [ 2.552816] 連結的模組[ 2.552843] CPU5 UID0 PID116 Comm modprobe 未受污染的 6.12.0-105.debug_vm2.el10.ppc64le+debug #1 VOLUNTARY [2.552859] 硬體名稱: IBM,9009-41A POWER9 (architected) 0x4e0202 0xf000005 來源:IBMFW910.00 (VL910_062) hv phyp pSeries [ 2.552872] NIPc0000000007eef3c LRc0000000007eef30 CTRc0000000003d8c90 [ 2.552885] REGSc0000000622e73b0 TRAP0700 未受污染 (6.12.0-105.debug_v m2.el10.ppc64le+debug) [ 2.552899] MSR
    800000000282b033<SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR24002822 XER0000000a [ 2.552954] CFAR
    c0000000008f03f0 IRQMASK: 0 [ 2.552954] GPR00: c0000000007eef30 c0000000622e7650 c000000002b1ac00 0000000000000001 [ 2.552954] GPR04: 0000000000000008 0000000000000000 c0000000007eef30 ffffffffffffffff [2.552954] GPR08: 00000000ffff00f5 0000000000000001 0000000000000048 0000000000004000 [ 2.552954] GPR12:
    00000003fa440000 c000000017ffa300 c0000000051d9f80 ffffffffffffffdb [ 2.552954] GPR16: 0000000000000000 0000000000000008 000000000000000a 60000000000000e0 [ 2.552954] GPR20: 4080000000000000 c0000000113af038 00007fffcf130000 0000700000000000 [ 2.552954] GPR24: c000000062a6a000 0000000000000001 8000000062a68000 0000000000000001 [ 2.552954] GPR28: 000000000000000a c000000062ebc600 0000000000002000 c000000062ebc760 [2.553170] NIP [c0000000007eef3c] free_pud_range+0x8bc/0x8d0 [ 2.553185] LR [c0000000007eef30] free_pud_range+0x8b0/0x8d0 [ 2.553199] Call Trace: [ 2.553207] [c0000000622e7650] [c0000000007eef30] free_pud_range+0x8b0/0x8d0 (unreliable) [ 2.553229] [c0000000622e7750] [c0000000007f40b4] free_pgd_range+0x284/0x3b0 [ 2.553248] [c0000000622e7800] [c0000000007f4630] free_pgtables+0x450/0x570 [2.553274] [c0000000622e78e0] [c0000000008161c0] exit_mmap+0x250/0x650 [ 2.553292] [c0000000622e7a30 ] [c0000000001b95b8] __mmput+0x98/0x290 [ 2.558344] [c0000000622e7a80] [c0000000001d1018] exit_mm+0x118/0x1b0 [ 2.558361] [c0000000622e7ac0] [c0000000622e7ac0] [c0000000+dox_doex] ec/0x870 [ 2.558376] [c0000000622e7b60] [c0000000001d1ca8] do_group_exit+0x88/0x150 [ 2.558391] [c0000000622e7bb0] [c0000000001d1db8] sys_exit_group+0x48/0x50 [ 2.558407] [c0000000622e7be0] [c00000000003d810] system_call_exception+0x1e0/0x4c0 [ 2.558423] [c0000000622e7e50] [c00000000000d05c] system_call_vectored_common+0x15c/0x2ec (...) [ 2.558892] ---[ end trace 0000000000000000 ]--- [ 2.559022] 錯誤錯誤的 rss 計數器狀態 mm:000000_ANONONS PAGE 類型val:1 [ 2.559037] 錯誤釋放 mm 時的非零 pgtables_bytesmm-6144 此處modprobe 處理程序結束時有一個從 mm_struct slab 中配置的 mm_struct而該 mm_struct slab 是由 debug_vm_pgtable 測試所使用。這不是問題因為 mm_stru ---truncated--- (CVE-2025-39776)

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

偵測

Linux Distros 未修補的弱點：CVE-2025-39776

medium Nessus Plugin ID 264718

版本 1.13