{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38621",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38621"
  ],
  "published": "2025-08-22T16:01:13Z",
  "summary": "md: make rdev_addable usable for rcu mode",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: make rdev_addable usable for rcu mode\n\nOur testcase trigger panic:\n\nBUG: kernel NULL pointer dereference, address: 00000000000000e0\n...\nOops: Oops: 0000 [#1] SMP NOPTI\nCPU: 2 UID: 0 PID: 85 Comm: kworker/2:1 Not tainted 6.16.0+ #94\nPREEMPT(none)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nWorkqueue: md_misc md_start_sync\nRIP: 0010:rdev_addable+0x4d/0xf0\n...\nCall Trace:\n <TASK>\n md_start_sync+0x329/0x480\n process_one_work+0x226/0x6d0\n worker_thread+0x19e/0x340\n kthread+0x10f/0x250\n ret_from_fork+0x14d/0x180\n ret_from_fork_asm+0x1a/0x30\n </TASK>\nModules linked in: raid10\nCR2: 00000000000000e0\n---[ end trace 0000000000000000 ]---\nRIP: 0010:rdev_addable+0x4d/0xf0\n\nmd_spares_need_change in md_start_sync will call rdev_addable which\nprotected by rcu_read_lock/rcu_read_unlock. This rcu context will help\nprotect rdev won't be released, but rdev->mddev will be set to NULL\nbefore we call synchronize_rcu in md_kick_rdev_from_array. Fix this by\nusing READ_ONCE and check does rdev->mddev still alive.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38621"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d713e105a6137d3f54f09d4d9e2273482057ca17"
    },
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      "url": "https://git.kernel.org/stable/c/b5fbe940862339cdcc34dea7a057ad18d18fa137"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/13017b427118f4311471ee47df74872372ca8482"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-07T15:43:32Z"
  }
}