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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime\n\nAfter commit ec6bb299c7c3 (\"md/md-bitmap: add \u0027sync_size\u0027 into struct\nmd_bitmap_stats\"), following panic is reported:\n\nOops: general protection fault, probably for non-canonical address\nRIP: 0010:bitmap_get_stats+0x2b/0xa0\nCall Trace:\n \u003cTASK\u003e\n md_seq_show+0x2d2/0x5b0\n seq_read_iter+0x2b9/0x470\n seq_read+0x12f/0x180\n proc_reg_read+0x57/0xb0\n vfs_read+0xf6/0x380\n ksys_read+0x6c/0xf0\n do_syscall_64+0x82/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRoot cause is that bitmap_get_stats() can be called at anytime if mddev\nis still there, even if bitmap is destroyed, or not fully initialized.\nDeferenceing bitmap in this case can crash the kernel. Meanwhile, the\nabove commit start to deferencing bitmap-\u003estorage, make the problem\neasier to trigger.\n\nFix the problem by protecting bitmap_get_stats() with bitmap_info.mutex."
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              "value": "AV:L - The vulnerability is reached by a plain read(2) on /proc/mdstat, a local procfs file; no network or adjacent-network exposure exists. Any local process on the machine can reach bitmap_get_stats() through seq_read \u2192 md_seq_show \u2192 md_bitmap_status.\nAC:L - On an array with an external-metadata bitmap (IMSM/DDF via mdmon), storage.sb_page is permanently NULL, so a single unconditional `cat /proc/mdstat` deterministically faults \u2014 no race to win. The lifetime-race variant is likewise attacker-driven, since the attacker can spin on /proc/mdstat reads at arbitrary rate to hit the resize/load/destroy window.\nPR:L - /proc/mdstat is world-readable (S_IRUGO) with no capability check in md_seq_open() or md_seq_show(), so only an ordinary unprivileged local account is needed. The vulnerable array configuration is an environmental precondition set by the administrator or mdmon, not a privilege the attacker must hold.\nUI:N - The attacker triggers the bug entirely on its own by reading /proc/mdstat; no victim action, mount, or file open by another user is required. Existing md arrays are enumerated automatically by the seq_file iterator.\nS:U - The corruption and its consequences stay within the kernel\u0027s own security authority on the same host, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel memory-safety defect.\nC:H - The unsynchronized access dereferences bitmap storage that concurrent __bitmap_resize()/bitmap_load()/bitmap_destroy() may have freed, kmapping a stale struct page and passing a dangling struct file to seq_file_path(), whose result is printed into the attacker-read /proc/mdstat. A groomed reallocation of the freed object turns this into a kernel-memory read primitive with the data disclosed to userspace.\nI:H - This is a use-after-free/lifetime defect on the bitmap and its storage, and a stale sb_page pointer controlled via heap reallocation is handed to kmap_local_page(), letting attacker-influenced kernel state drive subsequent memory accesses. Consistent with kernel UAF scoring, the corrupted-object dereference is treated as exploitable for control over kernel data.\nA:H - The reported and reproducible outcome is a general protection fault on a non-canonical address in bitmap_get_stats(), i.e. a kernel oops (panic with panic_on_oops), triggerable at will by any local user. Worse, the fault occurs while spin_lock(\u0026mddev-\u003elock) is held, leaking the spinlock and deadlocking all further md activity on that array."
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Meanwhile, the\\nabove commit start to deferencing bitmap-\u003estorage, make the problem\\neasier to trigger.\\n\\nFix the problem by protecting bitmap_get_stats() with bitmap_info.mutex.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: md/md-bitmap: sincronizar bitmap_get_stats() con el tiempo de vida del mapa de bits Despu\u00e9s de el commit ec6bb299c7c3 (\\\"md/md-bitmap: agregar \u0027sync_size\u0027 en la estructura md_bitmap_stats\\\"), se informa el siguiente p\u00e1nico: Vaya: error de protecci\u00f3n general, probablemente para una direcci\u00f3n no can\u00f3nica RIP: 0010:bitmap_get_stats+0x2b/0xa0 Seguimiento de llamadas:  md_seq_show+0x2d2/0x5b0 seq_read_iter+0x2b9/0x470 seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6c/0xf0 La causa principal es que bitmap_get_stats() se puede llamar en cualquier momento si mddev a\u00fan est\u00e1 all\u00ed, incluso si bitmap se destruye o no se inicializa por completo. La deferenciaci\u00f3n de bitmap en este caso puede hacer que el kernel se bloquee. Mientras tanto, el commit anterior comienza a deferenciar bitmap-\u0026gt;storage, lo que hace que el problema sea m\u00e1s f\u00e1cil de desencadenar. 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-30T10:13:38+00:00",
      "cve": "CVE-2025-21712",
      "id": "CVE-2025-21712",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21712.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T19:05:52Z",
      "cve": "CVE-2025-21712",
      "id": "CVE-2025-21712",
      "initial_release_date": "2025-02-28T02:22:06Z",
      "product_status:known_affected": "372",
      "product_status:known_not_affected": "59",
      "product_status:recommended": "26",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21712",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21712.json",
      "version": "38"
    }
  }
}