CVE-2025-39878 (GCVE-0-2025-39878)
Vulnerability from cvelistv5
Published
2025-09-23 06:00
Modified
2025-09-29 06:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was created by commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method") by moving code from ceph_writepages_start() to this function. This new function is supposed to return an error code which is checked by the caller (now ceph_process_folio_batch()), and on error, the caller invokes redirty_page_for_writepage() and then breaks from the loop. However, the refactoring commit has gone wrong, and it by accident, it always returns 0 (= success) because it first NULLs the pointer and then returns PTR_ERR(NULL) which is always 0. This means errors are silently ignored, leaving NULL entries in the page array, which may later crash the kernel. The simple solution is to call PTR_ERR() before clearing the pointer.
References
Impacted products
Vendor Product Version
Linux Linux Version: ce80b76dd32764cc914975777e058d4fae4f0ea0
Version: ce80b76dd32764cc914975777e058d4fae4f0ea0
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/addr.c"
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          "vendor": "Linux",
          "versions": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix crash after fscrypt_encrypt_pagecache_blocks() error\n\nThe function move_dirty_folio_in_page_array() was created by commit\nce80b76dd327 (\"ceph: introduce ceph_process_folio_batch() method\") by\nmoving code from ceph_writepages_start() to this function.\n\nThis new function is supposed to return an error code which is checked\nby the caller (now ceph_process_folio_batch()), and on error, the\ncaller invokes redirty_page_for_writepage() and then breaks from the\nloop.\n\nHowever, the refactoring commit has gone wrong, and it by accident, it\nalways returns 0 (= success) because it first NULLs the pointer and\nthen returns PTR_ERR(NULL) which is always 0.  This means errors are\nsilently ignored, leaving NULL entries in the page array, which may\nlater crash the kernel.\n\nThe simple solution is to call PTR_ERR() before clearing the pointer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:01:37.095Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/dd1616ecbea920d228c56729461ed223cc501425"
        },
        {
          "url": "https://git.kernel.org/stable/c/249e0a47cdb46bb9eae65511c569044bd8698d7d"
        }
      ],
      "title": "ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39878",
    "datePublished": "2025-09-23T06:00:48.850Z",
    "dateReserved": "2025-04-16T07:20:57.144Z",
    "dateUpdated": "2025-09-29T06:01:37.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39878\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-23T06:15:47.377\",\"lastModified\":\"2025-09-24T18:11:24.520\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nceph: fix crash after fscrypt_encrypt_pagecache_blocks() error\\n\\nThe function move_dirty_folio_in_page_array() was created by commit\\nce80b76dd327 (\\\"ceph: introduce ceph_process_folio_batch() method\\\") by\\nmoving code from ceph_writepages_start() to this function.\\n\\nThis new function is supposed to return an error code which is checked\\nby the caller (now ceph_process_folio_batch()), and on error, the\\ncaller invokes redirty_page_for_writepage() and then breaks from the\\nloop.\\n\\nHowever, the refactoring commit has gone wrong, and it by accident, it\\nalways returns 0 (= success) because it first NULLs the pointer and\\nthen returns PTR_ERR(NULL) which is always 0.  This means errors are\\nsilently ignored, leaving NULL entries in the page array, which may\\nlater crash the kernel.\\n\\nThe simple solution is to call PTR_ERR() before clearing the pointer.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/249e0a47cdb46bb9eae65511c569044bd8698d7d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd1616ecbea920d228c56729461ed223cc501425\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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