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/migrate_device不将要释放的 folio 添加到 migrate_device_finalize() 中的 LRU 如果迁移成功我们会调用 folio_migrate_flags()->mem_cgroup_migrate() 以将 memcg 从旧 folio 迁移到新 folio。
    这会将旧作品集的 memcg_data 设置为 0。同样，如果迁移失败，dst folio 的 memcg_data 也不会设置。如果对此类 folio (memcg_data == 0) 调用 folio_putback_lru()会将要释放的 folio 添加到 LRU从而造成 memcg 代码不良。运行 hmm selftests# ./hmm-tests ... # RUN hmm.hmm_device_private.migrate ... [ 102.078007][T14893] pagerefcount:1 mapcount:0 mapping:0000000000000000 index:0x7ff27d200 pfn:0x13cc00 [ 102.079974][T14893] 匿名标记
    0x17ff00000020018uptodate|dirty|swapbacked|node=0|zone=2| []lastcpupid=0x7ff[ [ 102.082037][T14893] raw
    017ff00000020018 dead000000000100 dead000000000122 ffff8881353896c9 [ 102.083687][T14893] raw
    00000007ff27d200 0000000000000000 00000001ffffffff 0000000000000000 [ 102.085331][T14893] 页面已转储原因 VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled()) [ 102.087230][----T14893] cut here ----] ------------ [ 102.088279][T14893] 警告CPU:0 PID: 14893 at ./include/linux/memcontrol.h:726 folio_lruvec_lock_irqsave+0x10e/0x170 [ 102.090478][T14893] 模块中链接的模块[ 102.091244][T14893] CPU
    0 UID: 0 PID: 14893 Comm: hmm-tests Not tainted 6.13.0-09623-g6c216bc522fd #151 [ 102.093089][T14893] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3 -2.fc40 04/01/2014 [ 102.094848][T14893] RIP0010:folio_lruvec_lock_irqsave+0x10e/0x170 [ 102.096104][T14893] Code:... [ 102.099908][T14893] RSP
    0018:ffffc900236c37b0 EFLAGS00010293 [ 102.101152][T14893] RAX: 0000000000000000 RBX: ffffea0004f30000 RCX: ffffffff8183f426 [ 102.102684][T14893] RDX: ffff8881063cb88ff1063cb88ff1
    ffff8881063cb880 [ 102.104227][T14893] RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 [102.105757][T14893] R10: 0000000000000001 R11: 0000000000000002 R12: ffffc900236c37d8 [102.107296][T14893] R13: ffff888277a2bcb0 R14: 000000000000001f R15: 0000000000000000 [102.108830][T14893] FS: 00007ff27dbdd740(0000) GS:ffff888277a00000(0000) knlGS:0000000000000000 [102.110643][T14893] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 102.111924][T14893] CR2:
    00007ff27d400000 CR3: 000000010866e000 CR4: 0000000000750ef0 [ 102.113478][T14893] PKRU: 55555554 [102.114172][T14893] 调用跟踪 [ 102.114805][T14893] <TASK> [ 102.115397][T14893] ? folio_lruvec_lock_irqsave+0x10e/0x170 [ 102.116547][T14893] ? __warn.cold+0x110/0x210 [102.117461][T14893] ? folio_lruvec_lock_irqsave+0x10e/0x170 [ 102.118667][T14893] ? report_bug+0x1b9/0x320 [ 102.119571][T14893] ? handle_bug+0x54/0x90 [ 102.120494][T14893] ? exc_invalid_op+0x17/0x50 [102.121433][T14893] ? asm_exc_invalid_op+0x1a/0x20 [ 102.122435][T14893] ?
    __wake_up_klogd.part.0+0x76/0xd0 [ 102.123506][T14893] ? dump_page+0x4f/0x60 [ 102.124352][T14893] ? folio_lruvec_lock_irqsave+0x10e/0x170 [ 102.125500][T14893] folio_batch_move_lru+0xd4/0x200 [102.126577][T14893] ? __pfx_lru_add+0x10/0x10 [ 102.127505][T14893] __folio_batch_add_and_move+0x391/0x720 [ 102.128633][T14893] ? __pfx_lru_add+0x10/0x10 [ 102.129550][T14893] folio_putback_lru+0x16/0x80 [102.130564][T14893] migrate_device_finalize+0x9b/0x530 [ 102.131640][T14893] dmirror_migrate_to_device.constprop.0+0x7c5/0xad0 [ 102.133047][T14893] dmirror_fops_unlocked_ioctl+0x89b/0xc80 可能不会有其他问题放置最后的 folio 引用将再次从 LRU 中删除 folio。因此除了 memcg 抱怨之外将要释放的 folio 添加到 LRU 只是一个不必要的步骤。新的流与 migrate_folio_move() 中的流类似将 dst 添加到 lru、rem ---truncated--- (CVE-2025-21861)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

检测

Linux Distros 未修补的漏洞：CVE-2025-21861

medium Nessus 插件 ID 246083

版本 1.10