CVE-2025-40134 (GCVE-0-2025-40134)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2025-12-01 06:18
VLAI?
Title
dm: fix NULL pointer dereference in __dm_suspend()
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: fix NULL pointer dereference in __dm_suspend() There is a race condition between dm device suspend and table load that can lead to null pointer dereference. The issue occurs when suspend is invoked before table load completes: BUG: kernel NULL pointer dereference, address: 0000000000000054 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50 Call Trace: <TASK> blk_mq_quiesce_queue+0x2c/0x50 dm_stop_queue+0xd/0x20 __dm_suspend+0x130/0x330 dm_suspend+0x11a/0x180 dev_suspend+0x27e/0x560 ctl_ioctl+0x4cf/0x850 dm_ctl_ioctl+0xd/0x20 vfs_ioctl+0x1d/0x50 __se_sys_ioctl+0x9b/0xc0 __x64_sys_ioctl+0x19/0x30 x64_sys_call+0x2c4a/0x4620 do_syscall_64+0x9e/0x1b0 The issue can be triggered as below: T1 T2 dm_suspend table_load __dm_suspend dm_setup_md_queue dm_mq_init_request_queue blk_mq_init_allocated_queue => q->mq_ops = set->ops; (1) dm_stop_queue / dm_wait_for_completion => q->tag_set NULL pointer! (2) => q->tag_set = set; (3) Fix this by checking if a valid table (map) exists before performing request-based suspend and waiting for target I/O. When map is NULL, skip these table-dependent suspend steps. Even when map is NULL, no I/O can reach any target because there is no table loaded; I/O submitted in this state will fail early in the DM layer. Skipping the table-dependent suspend logic in this case is safe and avoids NULL pointer dereferences.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98 (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 30f95b7eda5966b81cb221bd569c0f095a068cf6 (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < a802901b75e13cc306f1b7ab0f062135c8034e9e (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 19ca4528666990be376ac3eb6fe667b03db5324d (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 331c2dd8ca8bad1a3ac10cce847ffb76158eece4 (git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 8d33a030c566e1f105cd5bf27f37940b6367f3be (git)
Create a notification for this product.
    Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix NULL pointer dereference in __dm_suspend()\n\nThere is a race condition between dm device suspend and table load that\ncan lead to null pointer dereference. The issue occurs when suspend is\ninvoked before table load completes:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000054\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\nRIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50\nCall Trace:\n  \u003cTASK\u003e\n  blk_mq_quiesce_queue+0x2c/0x50\n  dm_stop_queue+0xd/0x20\n  __dm_suspend+0x130/0x330\n  dm_suspend+0x11a/0x180\n  dev_suspend+0x27e/0x560\n  ctl_ioctl+0x4cf/0x850\n  dm_ctl_ioctl+0xd/0x20\n  vfs_ioctl+0x1d/0x50\n  __se_sys_ioctl+0x9b/0xc0\n  __x64_sys_ioctl+0x19/0x30\n  x64_sys_call+0x2c4a/0x4620\n  do_syscall_64+0x9e/0x1b0\n\nThe issue can be triggered as below:\n\nT1 \t\t\t\t\t\tT2\ndm_suspend\t\t\t\t\ttable_load\n__dm_suspend\t\t\t\t\tdm_setup_md_queue\n\t\t\t\t\t\tdm_mq_init_request_queue\n\t\t\t\t\t\tblk_mq_init_allocated_queue\n\t\t\t\t\t\t=\u003e q-\u003emq_ops = set-\u003eops; (1)\ndm_stop_queue / dm_wait_for_completion\n=\u003e q-\u003etag_set NULL pointer!\t(2)\n\t\t\t\t\t\t=\u003e q-\u003etag_set = set; (3)\n\nFix this by checking if a valid table (map) exists before performing\nrequest-based suspend and waiting for target I/O. When map is NULL,\nskip these table-dependent suspend steps.\n\nEven when map is NULL, no I/O can reach any target because there is\nno table loaded; I/O submitted in this state will fail early in the\nDM layer. Skipping the table-dependent suspend logic in this case\nis safe and avoids NULL pointer dereferences."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T06:18:40.912Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98"
        },
        {
          "url": "https://git.kernel.org/stable/c/30f95b7eda5966b81cb221bd569c0f095a068cf6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a802901b75e13cc306f1b7ab0f062135c8034e9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/19ca4528666990be376ac3eb6fe667b03db5324d"
        },
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          "url": "https://git.kernel.org/stable/c/331c2dd8ca8bad1a3ac10cce847ffb76158eece4"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d33a030c566e1f105cd5bf27f37940b6367f3be"
        }
      ],
      "title": "dm: fix NULL pointer dereference in __dm_suspend()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40134",
    "datePublished": "2025-11-12T10:23:22.771Z",
    "dateReserved": "2025-04-16T07:20:57.170Z",
    "dateUpdated": "2025-12-01T06:18:40.912Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40134\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T11:15:43.100\",\"lastModified\":\"2025-11-12T16:19:12.850\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm: fix NULL pointer dereference in __dm_suspend()\\n\\nThere is a race condition between dm device suspend and table load that\\ncan lead to null pointer dereference. The issue occurs when suspend is\\ninvoked before table load completes:\\n\\nBUG: kernel NULL pointer dereference, address: 0000000000000054\\nOops: 0000 [#1] PREEMPT SMP PTI\\nCPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\\nRIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50\\nCall Trace:\\n  \u003cTASK\u003e\\n  blk_mq_quiesce_queue+0x2c/0x50\\n  dm_stop_queue+0xd/0x20\\n  __dm_suspend+0x130/0x330\\n  dm_suspend+0x11a/0x180\\n  dev_suspend+0x27e/0x560\\n  ctl_ioctl+0x4cf/0x850\\n  dm_ctl_ioctl+0xd/0x20\\n  vfs_ioctl+0x1d/0x50\\n  __se_sys_ioctl+0x9b/0xc0\\n  __x64_sys_ioctl+0x19/0x30\\n  x64_sys_call+0x2c4a/0x4620\\n  do_syscall_64+0x9e/0x1b0\\n\\nThe issue can be triggered as below:\\n\\nT1 \\t\\t\\t\\t\\t\\tT2\\ndm_suspend\\t\\t\\t\\t\\ttable_load\\n__dm_suspend\\t\\t\\t\\t\\tdm_setup_md_queue\\n\\t\\t\\t\\t\\t\\tdm_mq_init_request_queue\\n\\t\\t\\t\\t\\t\\tblk_mq_init_allocated_queue\\n\\t\\t\\t\\t\\t\\t=\u003e q-\u003emq_ops = set-\u003eops; (1)\\ndm_stop_queue / dm_wait_for_completion\\n=\u003e q-\u003etag_set NULL pointer!\\t(2)\\n\\t\\t\\t\\t\\t\\t=\u003e q-\u003etag_set = set; (3)\\n\\nFix this by checking if a valid table (map) exists before performing\\nrequest-based suspend and waiting for target I/O. When map is NULL,\\nskip these table-dependent suspend steps.\\n\\nEven when map is NULL, no I/O can reach any target because there is\\nno table loaded; I/O submitted in this state will fail early in the\\nDM layer. Skipping the table-dependent suspend logic in this case\\nis safe and avoids NULL pointer dereferences.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19ca4528666990be376ac3eb6fe667b03db5324d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30f95b7eda5966b81cb221bd569c0f095a068cf6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/331c2dd8ca8bad1a3ac10cce847ffb76158eece4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8d33a030c566e1f105cd5bf27f37940b6367f3be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a802901b75e13cc306f1b7ab0f062135c8034e9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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