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CVE-2025-38442 (GCVE-0-2025-38442)

Vulnerability from cvelistv5 – Published: 2025-07-25 15:27 – Updated: 2026-05-11 21:28
VLAI
Title
block: reject bs > ps block devices when THP is disabled
Summary
In the Linux kernel, the following vulnerability has been resolved: block: reject bs > ps block devices when THP is disabled If THP is disabled and when a block device with logical block size > page size is present, the following null ptr deref panic happens during boot: [ [13.2 mK AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07] [ 13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380 <snip> [ 13.025448] Call Trace: [ 13.025692] <TASK> [ 13.025895] block_read_full_folio+0x610/0x780 [ 13.026379] ? __pfx_blkdev_get_block+0x10/0x10 [ 13.027008] ? __folio_batch_add_and_move+0x1fa/0x2b0 [ 13.027548] ? __pfx_blkdev_read_folio+0x10/0x10 [ 13.028080] filemap_read_folio+0x9b/0x200 [ 13.028526] ? __pfx_filemap_read_folio+0x10/0x10 [ 13.029030] ? __filemap_get_folio+0x43/0x620 [ 13.029497] do_read_cache_folio+0x155/0x3b0 [ 13.029962] ? __pfx_blkdev_read_folio+0x10/0x10 [ 13.030381] read_part_sector+0xb7/0x2a0 [ 13.030805] read_lba+0x174/0x2c0 <snip> [ 13.045348] nvme_scan_ns+0x684/0x850 [nvme_core] [ 13.045858] ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core] [ 13.046414] ? _raw_spin_unlock+0x15/0x40 [ 13.046843] ? __switch_to+0x523/0x10a0 [ 13.047253] ? kvm_clock_get_cycles+0x14/0x30 [ 13.047742] ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core] [ 13.048353] async_run_entry_fn+0x96/0x4f0 [ 13.048787] process_one_work+0x667/0x10a0 [ 13.049219] worker_thread+0x63c/0xf60 As large folio support depends on THP, only allow bs > ps block devices if THP is enabled.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 47dd67532303803a87f43195e088b3b4bcf0454d , < b025d81b96bfe8a62b6e3e6ac776608206ccbf6d (git)
Affected: 47dd67532303803a87f43195e088b3b4bcf0454d , < 4cdf1bdd45ac78a088773722f009883af30ad318 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/blkdev.h"
          ],
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            }
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        },
        {
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          "product": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "6.15"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.15.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: reject bs \u003e ps block devices when THP is disabled\n\nIf THP is disabled and when a block device with logical block size \u003e\npage size is present, the following null ptr deref panic happens during\nboot:\n\n[   [13.2 mK  AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07]\n[   13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380\n\u003csnip\u003e\n[   13.025448] Call Trace:\n[   13.025692]  \u003cTASK\u003e\n[   13.025895]  block_read_full_folio+0x610/0x780\n[   13.026379]  ? __pfx_blkdev_get_block+0x10/0x10\n[   13.027008]  ? __folio_batch_add_and_move+0x1fa/0x2b0\n[   13.027548]  ? __pfx_blkdev_read_folio+0x10/0x10\n[   13.028080]  filemap_read_folio+0x9b/0x200\n[   13.028526]  ? __pfx_filemap_read_folio+0x10/0x10\n[   13.029030]  ? __filemap_get_folio+0x43/0x620\n[   13.029497]  do_read_cache_folio+0x155/0x3b0\n[   13.029962]  ? __pfx_blkdev_read_folio+0x10/0x10\n[   13.030381]  read_part_sector+0xb7/0x2a0\n[   13.030805]  read_lba+0x174/0x2c0\n\u003csnip\u003e\n[   13.045348]  nvme_scan_ns+0x684/0x850 [nvme_core]\n[   13.045858]  ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core]\n[   13.046414]  ? _raw_spin_unlock+0x15/0x40\n[   13.046843]  ? __switch_to+0x523/0x10a0\n[   13.047253]  ? kvm_clock_get_cycles+0x14/0x30\n[   13.047742]  ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core]\n[   13.048353]  async_run_entry_fn+0x96/0x4f0\n[   13.048787]  process_one_work+0x667/0x10a0\n[   13.049219]  worker_thread+0x63c/0xf60\n\nAs large folio support depends on THP, only allow bs \u003e ps block devices\nif THP is enabled."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:28:05.220Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b025d81b96bfe8a62b6e3e6ac776608206ccbf6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4cdf1bdd45ac78a088773722f009883af30ad318"
        }
      ],
      "title": "block: reject bs \u003e ps block devices when THP is disabled",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38442",
    "datePublished": "2025-07-25T15:27:26.009Z",
    "dateReserved": "2025-04-16T04:51:24.016Z",
    "dateUpdated": "2026-05-11T21:28:05.220Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-38442",
      "date": "2026-09-16",
      "epss": "0.0014",
      "percentile": "0.03719"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38442\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T16:15:29.630\",\"lastModified\":\"2026-06-17T09:16:51.897\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblock: reject bs \u003e ps block devices when THP is disabled\\n\\nIf THP is disabled and when a block device with logical block size \u003e\\npage size is present, the following null ptr deref panic happens during\\nboot:\\n\\n[   [13.2 mK  AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07]\\n[   13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380\\n\u003csnip\u003e\\n[   13.025448] Call Trace:\\n[   13.025692]  \u003cTASK\u003e\\n[   13.025895]  block_read_full_folio+0x610/0x780\\n[   13.026379]  ? __pfx_blkdev_get_block+0x10/0x10\\n[   13.027008]  ? __folio_batch_add_and_move+0x1fa/0x2b0\\n[   13.027548]  ? __pfx_blkdev_read_folio+0x10/0x10\\n[   13.028080]  filemap_read_folio+0x9b/0x200\\n[   13.028526]  ? __pfx_filemap_read_folio+0x10/0x10\\n[   13.029030]  ? __filemap_get_folio+0x43/0x620\\n[   13.029497]  do_read_cache_folio+0x155/0x3b0\\n[   13.029962]  ? __pfx_blkdev_read_folio+0x10/0x10\\n[   13.030381]  read_part_sector+0xb7/0x2a0\\n[   13.030805]  read_lba+0x174/0x2c0\\n\u003csnip\u003e\\n[   13.045348]  nvme_scan_ns+0x684/0x850 [nvme_core]\\n[   13.045858]  ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core]\\n[   13.046414]  ? _raw_spin_unlock+0x15/0x40\\n[   13.046843]  ? __switch_to+0x523/0x10a0\\n[   13.047253]  ? kvm_clock_get_cycles+0x14/0x30\\n[   13.047742]  ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core]\\n[   13.048353]  async_run_entry_fn+0x96/0x4f0\\n[   13.048787]  process_one_work+0x667/0x10a0\\n[   13.049219]  worker_thread+0x63c/0xf60\\n\\nAs large folio support depends on THP, only allow bs \u003e ps block devices\\nif THP is enabled.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: rechazar dispositivos de bloque bs \u0026gt; ps cuando THP est\u00e1 deshabilitado Si THP est\u00e1 deshabilitado y cuando hay un dispositivo de bloque con un tama\u00f1o de bloque l\u00f3gico \u0026gt; tama\u00f1o de p\u00e1gina, se produce el siguiente p\u00e1nico de desreferencia de ptr nulo durante el arranque:[ [13.2 mK AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07] [ 13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380  [ 13.025448] Call Trace: [ 13.025692]  [ 13.025895] block_read_full_folio+0x610/0x780 [ 13.026379] ? __pfx_blkdev_get_block+0x10/0x10 [ 13.027008] ? __folio_batch_add_and_move+0x1fa/0x2b0 [ 13.027548] ? __pfx_blkdev_read_folio+0x10/0x10 [ 13.028080] filemap_read_folio+0x9b/0x200 [ 13.028526] ? __pfx_filemap_read_folio+0x10/0x10 [ 13.029030] ? __filemap_get_folio+0x43/0x620 [ 13.029497] do_read_cache_folio+0x155/0x3b0 [ 13.029962] ? __pfx_blkdev_read_folio+0x10/0x10 [ 13.030381] read_part_sector+0xb7/0x2a0 [ 13.030805] read_lba+0x174/0x2c0  [ 13.045348] nvme_scan_ns+0x684/0x850 [nvme_core] [ 13.045858] ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core] [ 13.046414] ? _raw_spin_unlock+0x15/0x40 [ 13.046843] ? __switch_to+0x523/0x10a0 [ 13.047253] ? kvm_clock_get_cycles+0x14/0x30 [ 13.047742] ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core] [ 13.048353] async_run_entry_fn+0x96/0x4f0 [ 13.048787] process_one_work+0x667/0x10a0 [ 13.049219] worker_thread+0x63c/0xf60 Como la compatibilidad con folios grandes depende de THP, solo se permiten dispositivos de bloque bs \u0026gt; ps si THP est\u00e1 habilitado.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/blkdev.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"47dd67532303803a87f43195e088b3b4bcf0454d\",\"lessThan\":\"b025d81b96bfe8a62b6e3e6ac776608206ccbf6d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"47dd67532303803a87f43195e088b3b4bcf0454d\",\"lessThan\":\"4cdf1bdd45ac78a088773722f009883af30ad318\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/blkdev.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.7\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.15\",\"versionEndExcluding\":\"6.15.7\",\"matchCriteriaId\":\"FBA11932-25B2-4915-A601-431072CDC904\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D4894DB-CCFE-4602-B1BF-3960B2E19A01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"09709862-E348-4378-8632-5A7813EDDC86\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"415BF58A-8197-43F5-B3D7-D1D63057A26E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A0517869-312D-4429-80C2-561086E1421C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"85421F4E-C863-4ABF-B4B4-E887CC2F7F92\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4cdf1bdd45ac78a088773722f009883af30ad318\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b025d81b96bfe8a62b6e3e6ac776608206ccbf6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:33:12+00:00",
      "cve": "CVE-2025-38442",
      "id": "CVE-2025-38442",
      "initial_release_date": "2025-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: block: reject bs \u003e ps block devices when THP is disabled",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38442.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:54:50Z",
      "cve": "CVE-2025-38442",
      "id": "CVE-2025-38442",
      "initial_release_date": "2025-07-25T23:23:00Z",
      "product_status:known_not_affected": "524",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38442",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38442.json",
      "version": "7"
    }
  }
}



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