CVE-2025-40006 (GCVE-0-2025-40006)

Vulnerability from cvelistv5 – Published: 2025-10-20 15:26 – Updated: 2025-10-20 15:26
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix folio is still mapped when deleted Migration may be raced with fallocating hole. remove_inode_single_folio will unmap the folio if the folio is still mapped. However, it's called without folio lock. If the folio is migrated and the mapped pte has been converted to migration entry, folio_mapped() returns false, and won't unmap it. Due to extra refcount held by remove_inode_single_folio, migration fails, restores migration entry to normal pte, and the folio is mapped again. As a result, we triggered BUG in filemap_unaccount_folio. The log is as follows: BUG: Bad page cache in process hugetlb pfn:156c00 page: refcount:515 mapcount:0 mapping:0000000099fef6e1 index:0x0 pfn:0x156c00 head: order:9 mapcount:1 entire_mapcount:1 nr_pages_mapped:0 pincount:0 aops:hugetlbfs_aops ino:dcc dentry name(?):"my_hugepage_file" flags: 0x17ffffc00000c1(locked|waiters|head|node=0|zone=2|lastcpupid=0x1fffff) page_type: f4(hugetlb) page dumped because: still mapped when deleted CPU: 1 UID: 0 PID: 395 Comm: hugetlb Not tainted 6.17.0-rc5-00044-g7aac71907bde-dirty #484 NONE Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 Call Trace: <TASK> dump_stack_lvl+0x4f/0x70 filemap_unaccount_folio+0xc4/0x1c0 __filemap_remove_folio+0x38/0x1c0 filemap_remove_folio+0x41/0xd0 remove_inode_hugepages+0x142/0x250 hugetlbfs_fallocate+0x471/0x5a0 vfs_fallocate+0x149/0x380 Hold folio lock before checking if the folio is mapped to avold race with migration.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < bc1c9ce8aeff45318332035dbef9713fb9e982d7 (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < 91f548e920fbf8be3f285bfa3fa045ae017e836d (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < 3e851448078f5b01f6264915df3cfef75e323a12 (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < c1dc0524ab2cc3982d4e0d2bfac71a0cd4d65c39 (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < c9c2a51f91aea70e89b496cac360cd795a2b3c26 (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < 910d7749346c4b0acdc6e4adfdc4a9984281a206 (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < 21ee79ce938127f88fe07e409c1817f477dbe7ea (git)
Affected: 4aae8d1c051ea00b456da6811bc36d1f69de5445 , < 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7 (git)
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    Linux Linux Affected: 4.5
Unaffected: 0 , < 4.5 (semver)
Unaffected: 5.4.300 , ≤ 5.4.* (semver)
Unaffected: 5.10.245 , ≤ 5.10.* (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.155 , ≤ 6.1.* (semver)
Unaffected: 6.6.109 , ≤ 6.6.* (semver)
Unaffected: 6.12.50 , ≤ 6.12.* (semver)
Unaffected: 6.16.10 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix folio is still mapped when deleted\n\nMigration may be raced with fallocating hole.  remove_inode_single_folio\nwill unmap the folio if the folio is still mapped.  However, it\u0027s called\nwithout folio lock.  If the folio is migrated and the mapped pte has been\nconverted to migration entry, folio_mapped() returns false, and won\u0027t\nunmap it.  Due to extra refcount held by remove_inode_single_folio,\nmigration fails, restores migration entry to normal pte, and the folio is\nmapped again.  As a result, we triggered BUG in filemap_unaccount_folio.\n\nThe log is as follows:\n BUG: Bad page cache in process hugetlb  pfn:156c00\n page: refcount:515 mapcount:0 mapping:0000000099fef6e1 index:0x0 pfn:0x156c00\n head: order:9 mapcount:1 entire_mapcount:1 nr_pages_mapped:0 pincount:0\n aops:hugetlbfs_aops ino:dcc dentry name(?):\"my_hugepage_file\"\n flags: 0x17ffffc00000c1(locked|waiters|head|node=0|zone=2|lastcpupid=0x1fffff)\n page_type: f4(hugetlb)\n page dumped because: still mapped when deleted\n CPU: 1 UID: 0 PID: 395 Comm: hugetlb Not tainted 6.17.0-rc5-00044-g7aac71907bde-dirty #484 NONE\n Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x4f/0x70\n  filemap_unaccount_folio+0xc4/0x1c0\n  __filemap_remove_folio+0x38/0x1c0\n  filemap_remove_folio+0x41/0xd0\n  remove_inode_hugepages+0x142/0x250\n  hugetlbfs_fallocate+0x471/0x5a0\n  vfs_fallocate+0x149/0x380\n\nHold folio lock before checking if the folio is mapped to avold race with\nmigration."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-20T15:26:53.097Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/bc1c9ce8aeff45318332035dbef9713fb9e982d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/91f548e920fbf8be3f285bfa3fa045ae017e836d"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e851448078f5b01f6264915df3cfef75e323a12"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1dc0524ab2cc3982d4e0d2bfac71a0cd4d65c39"
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          "url": "https://git.kernel.org/stable/c/c9c2a51f91aea70e89b496cac360cd795a2b3c26"
        },
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          "url": "https://git.kernel.org/stable/c/910d7749346c4b0acdc6e4adfdc4a9984281a206"
        },
        {
          "url": "https://git.kernel.org/stable/c/21ee79ce938127f88fe07e409c1817f477dbe7ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7"
        }
      ],
      "title": "mm/hugetlb: fix folio is still mapped when deleted",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40006",
    "datePublished": "2025-10-20T15:26:53.097Z",
    "dateReserved": "2025-04-16T07:20:57.151Z",
    "dateUpdated": "2025-10-20T15:26:53.097Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40006\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-20T16:15:37.240\",\"lastModified\":\"2025-10-21T19:31:25.450\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/hugetlb: fix folio is still mapped when deleted\\n\\nMigration may be raced with fallocating hole.  remove_inode_single_folio\\nwill unmap the folio if the folio is still mapped.  However, it\u0027s called\\nwithout folio lock.  If the folio is migrated and the mapped pte has been\\nconverted to migration entry, folio_mapped() returns false, and won\u0027t\\nunmap it.  Due to extra refcount held by remove_inode_single_folio,\\nmigration fails, restores migration entry to normal pte, and the folio is\\nmapped again.  As a result, we triggered BUG in filemap_unaccount_folio.\\n\\nThe log is as follows:\\n BUG: Bad page cache in process hugetlb  pfn:156c00\\n page: refcount:515 mapcount:0 mapping:0000000099fef6e1 index:0x0 pfn:0x156c00\\n head: order:9 mapcount:1 entire_mapcount:1 nr_pages_mapped:0 pincount:0\\n aops:hugetlbfs_aops ino:dcc dentry name(?):\\\"my_hugepage_file\\\"\\n flags: 0x17ffffc00000c1(locked|waiters|head|node=0|zone=2|lastcpupid=0x1fffff)\\n page_type: f4(hugetlb)\\n page dumped because: still mapped when deleted\\n CPU: 1 UID: 0 PID: 395 Comm: hugetlb Not tainted 6.17.0-rc5-00044-g7aac71907bde-dirty #484 NONE\\n Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015\\n Call Trace:\\n  \u003cTASK\u003e\\n  dump_stack_lvl+0x4f/0x70\\n  filemap_unaccount_folio+0xc4/0x1c0\\n  __filemap_remove_folio+0x38/0x1c0\\n  filemap_remove_folio+0x41/0xd0\\n  remove_inode_hugepages+0x142/0x250\\n  hugetlbfs_fallocate+0x471/0x5a0\\n  vfs_fallocate+0x149/0x380\\n\\nHold folio lock before checking if the folio is mapped to avold race with\\nmigration.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/21ee79ce938127f88fe07e409c1817f477dbe7ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e851448078f5b01f6264915df3cfef75e323a12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/910d7749346c4b0acdc6e4adfdc4a9984281a206\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91f548e920fbf8be3f285bfa3fa045ae017e836d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc1c9ce8aeff45318332035dbef9713fb9e982d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1dc0524ab2cc3982d4e0d2bfac71a0cd4d65c39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9c2a51f91aea70e89b496cac360cd795a2b3c26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.