Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - mm/debug_vm_pgtable清除 destroy_args() 中的页表条目 mm/debug_vm_pagetable 测试为其运行的测试分配页表条目同时使用其手动分配的 mm_struct。其本身没有问题但当其退出时在 destroy_args() 中无法使用 *_clear 函数清除这些条目。问题在于 会保留过时条目。如果另一个进程使用相同地址的 pgd 分配 mm_struct则可能以遇到过时条目而告终。实际上在 CONFIG_DEBUG_VM_PGTABLE=y 的调试内核上会发生这种情况例如这是我添加了一些额外调试的输出如果 pgtables_bytes 变为负值除了在 check_mm() 函数发出警告它还会打印警告跟踪 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] WARNINGCPU: 5 PID: 116 at include/linux/mm.h:2841 free_pud_range+0x8bc/0x8d0 [ 2.552816] 中链接的模块[ 2.552843] CPU: 5 UID: 0 PID: 116 Comm modprobe Not tainted 6.12.0-105.debug_vm2.el10.ppc64le+debug #1 VOLUNTARY [2.552859] 硬件名称IBM,9009-41A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW910.00 (VL910_062) hv :phyp pSeries [ 2.552872] NIPc0000000007eef3c LRc0000000007eef30 CTRc0000000003d8c90 [ 2.552885] REGSc0000000622e73b0 TRAP0700 未受感染 (6.12.0-105.debug_v m2.el10.ppc64le+debug[ 2.552899] MSR
    800000000282b033<SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 24002822 XER: 0000000a [ 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] [c0000000001d1c0000000001d1c] 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] BUG不正确的 rss-counter 状态 mm:000000002267MM_ANONSPAGEONSPAGE9e type val:1 [ 2.559037] BUG释放 mm 时非零 pgtables_bytes: -6144 此处 modprobe 进程以来自 debug_vm_pgtable 测试之前使用的 mm_struct slab 中的已分配 mm_struct 告终。这不是问题因为 mm_stru ---truncated--- (CVE-2025-39776]

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检测

Linux Distros 未修补的漏洞：CVE-2025-39776

high Nessus 插件 ID 264718

版本 1.39