CVE-2025-38621 (GCVE-0-2025-38621)
Vulnerability from cvelistv5
Published
2025-08-22 16:00
Modified
2025-08-22 16:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md: make rdev_addable usable for rcu mode Our testcase trigger panic: BUG: kernel NULL pointer dereference, address: 00000000000000e0 ... Oops: Oops: 0000 [#1] SMP NOPTI CPU: 2 UID: 0 PID: 85 Comm: kworker/2:1 Not tainted 6.16.0+ #94 PREEMPT(none) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 Workqueue: md_misc md_start_sync RIP: 0010:rdev_addable+0x4d/0xf0 ... Call Trace: <TASK> md_start_sync+0x329/0x480 process_one_work+0x226/0x6d0 worker_thread+0x19e/0x340 kthread+0x10f/0x250 ret_from_fork+0x14d/0x180 ret_from_fork_asm+0x1a/0x30 </TASK> Modules linked in: raid10 CR2: 00000000000000e0 ---[ end trace 0000000000000000 ]--- RIP: 0010:rdev_addable+0x4d/0xf0 md_spares_need_change in md_start_sync will call rdev_addable which protected by rcu_read_lock/rcu_read_unlock. This rcu context will help protect rdev won't be released, but rdev->mddev will be set to NULL before we call synchronize_rcu in md_kick_rdev_from_array. Fix this by using READ_ONCE and check does rdev->mddev still alive.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13017b427118f4311471ee47df74872372ca8482
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5fbe940862339cdcc34dea7a057ad18d18fa137
Impacted products
Vendor Product Version
Linux Linux Version: bc08041b32abe6c9824f78735bac22018eabfc06
Version: bc08041b32abe6c9824f78735bac22018eabfc06
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   Linux Linux Version: 6.7
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md.c"
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              "version": "6.17-rc1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
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              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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\u0027t be released, but rdev-\u003emddev 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-\u003emddev still alive."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-22T16:00:30.308Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b5fbe940862339cdcc34dea7a057ad18d18fa137"
        },
        {
          "url": "https://git.kernel.org/stable/c/13017b427118f4311471ee47df74872372ca8482"
        }
      ],
      "title": "md: make rdev_addable usable for rcu mode",
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38621",
    "datePublished": "2025-08-22T16:00:30.308Z",
    "dateReserved": "2025-04-16T04:51:24.029Z",
    "dateUpdated": "2025-08-22T16:00:30.308Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38621\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-22T16:15:35.460\",\"lastModified\":\"2025-08-22T18:08:51.663\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 \u003cTASK\u003e\\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 \u003c/TASK\u003e\\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\u0027t be released, but rdev-\u003emddev 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-\u003emddev still alive.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13017b427118f4311471ee47df74872372ca8482\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5fbe940862339cdcc34dea7a057ad18d18fa137\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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