CVE-2025-22036 (GCVE-0-2025-22036)
Vulnerability from cvelistv5
Published
2025-04-16 14:11
Modified
2025-05-26 05:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: exfat: fix random stack corruption after get_block When get_block is called with a buffer_head allocated on the stack, such as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in the following race condition situation. <CPU 0> <CPU 1> mpage_read_folio <<bh on stack>> do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer <<keep going>> ... ... ... ... <<bh is not valid out of mpage_read_folio>> . . another_function <<variable A on stack>> put_bh(bh) atomic_dec(bh->b_count) * stack corruption here * This patch returns -EAGAIN if a folio does not have buffers when bh_read needs to be called. By doing this, the caller can fallback to functions like block_read_full_folio(), create a buffer_head in the folio, and then call get_block again. Let's do not call bh_read() with on-stack buffer_head.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1bb7ff4204b6d4927e982cd256286c09ed4fd8caPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7447286363dc1e410bf30b87d75168f3519f9ccPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f807a6bf2005740fa26b4f59c4a003dc966b9afdPatch
Impacted products
Vendor Product Version
Linux Linux Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
Version: 11a347fb6cef62ce47e84b97c45f2b2497c7593b
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   Linux Linux Version: 6.8
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "fs/exfat/inode.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix random stack corruption after get_block\n\nWhen get_block is called with a buffer_head allocated on the stack, such\nas do_mpage_readpage, stack corruption due to buffer_head UAF may occur in\nthe following race condition situation.\n\n     \u003cCPU 0\u003e                      \u003cCPU 1\u003e\nmpage_read_folio\n  \u003c\u003cbh on stack\u003e\u003e\n  do_mpage_readpage\n    exfat_get_block\n      bh_read\n        __bh_read\n\t  get_bh(bh)\n          submit_bh\n          wait_on_buffer\n                              ...\n                              end_buffer_read_sync\n                                __end_buffer_read_notouch\n                                   unlock_buffer\n          \u003c\u003ckeep going\u003e\u003e\n        ...\n      ...\n    ...\n  ...\n\u003c\u003cbh is not valid out of mpage_read_folio\u003e\u003e\n   .\n   .\nanother_function\n  \u003c\u003cvariable A on stack\u003e\u003e\n                                   put_bh(bh)\n                                     atomic_dec(bh-\u003eb_count)\n  * stack corruption here *\n\nThis patch returns -EAGAIN if a folio does not have buffers when bh_read\nneeds to be called. By doing this, the caller can fallback to functions\nlike block_read_full_folio(), create a buffer_head in the folio, and then\ncall get_block again.\n\nLet\u0027s do not call bh_read() with on-stack buffer_head."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:17:05.028Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/1bb7ff4204b6d4927e982cd256286c09ed4fd8ca"
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      ],
      "title": "exfat: fix random stack corruption after get_block",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22036",
    "datePublished": "2025-04-16T14:11:54.916Z",
    "dateReserved": "2024-12-29T08:45:45.809Z",
    "dateUpdated": "2025-05-26T05:17:05.028Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22036\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:15:56.217\",\"lastModified\":\"2025-04-29T18:58:37.880\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nexfat: fix random stack corruption after get_block\\n\\nWhen get_block is called with a buffer_head allocated on the stack, such\\nas do_mpage_readpage, stack corruption due to buffer_head UAF may occur in\\nthe following race condition situation.\\n\\n     \u003cCPU 0\u003e                      \u003cCPU 1\u003e\\nmpage_read_folio\\n  \u003c\u003cbh on stack\u003e\u003e\\n  do_mpage_readpage\\n    exfat_get_block\\n      bh_read\\n        __bh_read\\n\\t  get_bh(bh)\\n          submit_bh\\n          wait_on_buffer\\n                              ...\\n                              end_buffer_read_sync\\n                                __end_buffer_read_notouch\\n                                   unlock_buffer\\n          \u003c\u003ckeep going\u003e\u003e\\n        ...\\n      ...\\n    ...\\n  ...\\n\u003c\u003cbh is not valid out of mpage_read_folio\u003e\u003e\\n   .\\n   .\\nanother_function\\n  \u003c\u003cvariable A on stack\u003e\u003e\\n                                   put_bh(bh)\\n                                     atomic_dec(bh-\u003eb_count)\\n  * stack corruption here *\\n\\nThis patch returns -EAGAIN if a folio does not have buffers when bh_read\\nneeds to be called. By doing this, the caller can fallback to functions\\nlike block_read_full_folio(), create a buffer_head in the folio, and then\\ncall get_block again.\\n\\nLet\u0027s do not call bh_read() with on-stack buffer_head.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: exfat: corrige la corrupci\u00f3n de pila aleatoria despu\u00e9s de get_block Cuando se llama a get_block con un buffer_head asignado en la pila, como do_mpage_readpage, puede ocurrir una corrupci\u00f3n de pila debido a buffer_head UAF en la siguiente situaci\u00f3n de condici\u00f3n de ejecuci\u00f3n.   mpage_read_folio \u0026lt;\u0026gt; do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer \u0026lt;\u0026gt; ... ... ... ... \u0026lt;\u0026gt; . . another_function \u0026lt;\u0026gt; put_bh(bh) atomic_dec(bh-\u0026gt;b_count) * Corrupci\u00f3n de pila aqu\u00ed * Este parche devuelve -EAGAIN si un folio no tiene b\u00faferes cuando se necesita llamar a bh_read. De esta manera, quien lo llama puede recurrir a funciones como block_read_full_folio(), crear un buffer_head en el folio y luego volver a llamar a get_block. No llamemos a bh_read() con buffer_head en la pila.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"},{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.8\",\"versionEndExcluding\":\"6.12.23\",\"matchCriteriaId\":\"70C1AA27-E71C-467A-AB28-979034C2B6CA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.11\",\"matchCriteriaId\":\"E7E864B0-8C00-4679-BA55-659B4C9C3AD3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.14\",\"versionEndExcluding\":\"6.14.2\",\"matchCriteriaId\":\"FADAE5D8-4808-442C-B218-77B2CE8780A0\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1bb7ff4204b6d4927e982cd256286c09ed4fd8ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f7447286363dc1e410bf30b87d75168f3519f9cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f807a6bf2005740fa26b4f59c4a003dc966b9afd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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