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CVE-2025-37779

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

lib/iov_iter: fix to increase non slab folio refcount

When testing EROFS file-backed mount over v9fs on qemu, I encountered a folio UAF issue. The page sanity check reports the following call trace. The root cause is that pages in bvec are coalesced across a folio bounary. The refcount of all non-slab folios should be increased to ensure p9_releas_pages can put them correctly.

Detalles técnicos trazas, registros y código del informe original
BUG: Bad page state in process md5sum  pfn:18300
page: refcount:0 mapcount:0 mapping:00000000d5ad8e4e index:0x60 pfn:0x18300
head: order:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
aops:z_erofs_aops ino:30b0f dentry name(?):"GoogleExtServicesCn.apk"
flags: 0x100000000000041(locked|head|node=0|zone=1)
raw: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0
raw: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000
head: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0
head: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000
head: 0100000000000000 0000000000000000 ffffffffffffffff 0000000000000000
head: 0000000000000010 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Call Trace:
 dump_stack_lvl+0x53/0x70
 bad_page+0xd4/0x220
 __free_pages_ok+0x76d/0xf30
 __folio_put+0x230/0x320
 p9_release_pages+0x179/0x1f0
 p9_virtio_zc_request+0xa2a/0x1230
 p9_client_zc_rpc.constprop.0+0x247/0x700
 p9_client_read_once+0x34d/0x810
 p9_client_read+0xf3/0x150
 v9fs_issue_read+0x111/0x360
 netfs_unbuffered_read_iter_locked+0x927/0x1390
 netfs_unbuffered_read_iter+0xa2/0xe0
 vfs_iocb_iter_read+0x2c7/0x460
 erofs_fileio_rq_submit+0x46b/0x5b0
 z_erofs_runqueue+0x1203/0x21e0
 z_erofs_readahead+0x579/0x8b0
 read_pages+0x19f/0xa70
 page_cache_ra_order+0x4ad/0xb80
 filemap_readahead.isra.0+0xe7/0x150
 filemap_get_pages+0x7aa/0x1890
 filemap_read+0x320/0xc80
 vfs_read+0x6c6/0xa30
 ksys_read+0xf9/0x1c0
 do_syscall_64+0x9e/0x1a0
 entry_SYSCALL_64_after_hwframe+0x71/0x79

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-37779",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "b9c0e49abfca06f1a109acea834bcfc934f33f76",
              "lessThan": "d833f21162c4d536d729628f8cf1ee8d4110f2b7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b9c0e49abfca06f1a109acea834bcfc934f33f76",
              "lessThan": "770c8d55c42868239c748a3ebc57c9e37755f842",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "lib/iov_iter.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.14.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "lib/iov_iter.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-05-01T14:15:41.733",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/770c8d55c42868239c748a3ebc57c9e37755f842",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d833f21162c4d536d729628f8cf1ee8d4110f2b7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/iov_iter: fix to increase non slab folio refcount\n\nWhen testing EROFS file-backed mount over v9fs on qemu, I encountered a\nfolio UAF issue.  The page sanity check reports the following call trace. \nThe root cause is that pages in bvec are coalesced across a folio bounary.\nThe refcount of all non-slab folios should be increased to ensure\np9_releas_pages can put them correctly.\n\nBUG: Bad page state in process md5sum  pfn:18300\npage: refcount:0 mapcount:0 mapping:00000000d5ad8e4e index:0x60 pfn:0x18300\nhead: order:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0\naops:z_erofs_aops ino:30b0f dentry name(?):\"GoogleExtServicesCn.apk\"\nflags: 0x100000000000041(locked|head|node=0|zone=1)\nraw: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0\nraw: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000\nhead: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0\nhead: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000\nhead: 0100000000000000 0000000000000000 ffffffffffffffff 0000000000000000\nhead: 0000000000000010 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set\nCall Trace:\n dump_stack_lvl+0x53/0x70\n bad_page+0xd4/0x220\n __free_pages_ok+0x76d/0xf30\n __folio_put+0x230/0x320\n p9_release_pages+0x179/0x1f0\n p9_virtio_zc_request+0xa2a/0x1230\n p9_client_zc_rpc.constprop.0+0x247/0x700\n p9_client_read_once+0x34d/0x810\n p9_client_read+0xf3/0x150\n v9fs_issue_read+0x111/0x360\n netfs_unbuffered_read_iter_locked+0x927/0x1390\n netfs_unbuffered_read_iter+0xa2/0xe0\n vfs_iocb_iter_read+0x2c7/0x460\n erofs_fileio_rq_submit+0x46b/0x5b0\n z_erofs_runqueue+0x1203/0x21e0\n z_erofs_readahead+0x579/0x8b0\n read_pages+0x19f/0xa70\n page_cache_ra_order+0x4ad/0xb80\n filemap_readahead.isra.0+0xe7/0x150\n filemap_get_pages+0x7aa/0x1890\n filemap_read+0x320/0xc80\n vfs_read+0x6c6/0xa30\n ksys_read+0xf9/0x1c0\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x71/0x79"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: lib/iov_iter: corrección para aumentar el recuento de referencias de folios no slab. Al probar el montaje basado en archivos EROFS sobre v9fs en qemu, se detectó un problema con el UAF de folio. La comprobación de integridad de la página informa el siguiente seguimiento de llamadas. La causa principal es que las páginas en bvec se fusionan en un límite de folio. Se debe aumentar el recuento de referencias de todos los folios no slab para garantizar que p9_relas_pages pueda colocarlos correctamente. ERROR: Estado de página incorrecto en proceso md5sum pfn:18300 página: refcount:0 mapcount:0 mapping:00000000d5ad8e4e índice:0x60 pfn:0x18300 encabezado: orden:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 aops:z_erofs_aops ino:30b0f dentry name(?):\"GoogleExtServicesCn.apk\" indicadores: 0x100000000000041(locked|head|node=0|zone=1) sin procesar: 0100000000000041 muerto000000000100 muerto000000000122 ffff888014b13bd0 sin procesar: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000 cabeza: 0100000000000041 muerto000000000100 muerto000000000122 ffff888014b13bd0 cabeza: 0000000000000060 0000000000000020 00000000ffffffff 000000000000000 cabeza: 010000000000000 000000000000000 ffffffffffffffff 00000000000000000 encabezado: 0000000000000010 0000000000000000 00000000ffffffff 0000000000000000 página volcada porque: PAGE_FLAGS_CHECK_AT_FREE indicador(es) establecido(s) Seguimiento de llamada: dump_stack_lvl+0x53/0x70 bad_page+0xd4/0x220 __free_pages_ok+0x76d/0xf30 __folio_put+0x230/0x320 p9_release_pages+0x179/0x1f0 p9_virtio_zc_request+0xa2a/0x1230 p9_client_zc_rpc.constprop.0+0x247/0x700 p9_client_read_once+0x34d/0x810 p9_client_read+0xf3/0x150 v9fs_issue_read+0x111/0x360 netfs_unbuffered_read_iter_locked+0x927/0x1390 netfs_unbuffered_read_iter+0xa2/0xe0 vfs_iocb_iter_read+0x2c7/0x460 erofs_fileio_rq_submit+0x46b/0x5b0 z_erofs_runqueue+0x1203/0x21e0 z_erofs_readahead+0x579/0x8b0 read_pages+0x19f/0xa70 page_cache_ra_order+0x4ad/0xb80 filemap_readahead.isra.0+0xe7/0x150 filemap_get_pages+0x7aa/0x1890 filemap_read+0x320/0xc80 vfs_read+0x6c6/0xa30 ksys_read+0xf9/0x1c0 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x71/0x79 "
    }
  ],
  "lastModified": "2026-07-30T06:22:20.153",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "26175852-4D93-410C-BC8C-C405F2A9D737",
              "versionEndExcluding": "6.14.4",
              "versionStartIncluding": "6.14.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7DE421BA-0600-4401-A175-73CAB6A6FB4E"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*",
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              "matchCriteriaId": "8D465631-2980-487A-8E65-40AE2B9F8ED1"
            },
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              "vulnerable": true,
              "matchCriteriaId": "4C9D071F-B28E-46EC-AC61-22B913390211"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}