{
  "cveId": "CVE-2026-92500",
  "url": "https://patchblox.com/security/cve/CVE-2026-92500",
  "summary": "CVE-2026-92500 is fixed in 31 products on 1 platform, first by DEBIAN-CVE-2026-92500, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ext4: use fsdata to track inline data write stat...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ext4: use fsdata to track inline data write state and fix race  Instead of checking the live inode state (ext4_has_inline_data(inode) and ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) in the write_end handlers, use the fsdata parameter of the address space operations to explicitly pass down the state in which write_begin prepared the write.  A concurrent thread (such as ext4_page_mkwrite()) can convert the inline data to an extent between write_begin and write_end. If this happens, the write_end handlers would previously miss the inline write_end path and fall through to extent-based write_end logic. However, since block buffers were never allocated in write_begin, this resulted in NULL pointer dereferences or data loss because folio_buffers(folio) was NULL.  Define EXT4_WRITE_DATA_INLINE (4) as a bit flag (Bit 2), treating fsdata as bitwise flags rather than mutually exclusive enums to keep states of the write path independent. Communicate this state via fsdata: 1) ext4_write_begin() and ext4_da_write_begin() set the    EXT4_WRITE_DATA_INLINE bit in *fsdata via bitwise OR when an inline    write is successfully prepared. 2) On entry, ext4_write_begin() clears the EXT4_WRITE_DATA_INLINE bit    to safely handle VFS retries (where generic_perform_write() bypasses    the fsdata initialization on its retry jump). 3) The write_end handlers perform a bitwise AND to check if the    EXT4_WRITE_DATA_INLINE bit is set and invoke the inline write_end    helper accordingly.  Furthermore, during a buffered write, ext4_write_inline_data_end() acquires the xattr lock after preparing the write. If a concurrent page fault (ext4_page_mkwrite()) converts the inline data to an extent after the write_end handlers check the state but before ext4_write_inline_data_end() acquires the xattr write lock, the subsequent check will trigger a kernel panic via BUG_ON(!ext4_has_inline_data(inode)).  To keep git history working and bisectability clean, replace the BUG_ON check in ext4_write_inline_data_end() with a graceful error- handling retry path in this same commit. If the inline data is cleared after locking the xattr, we safely release all resources (releasing iloc.bh, unlocking/putting the folio, stopping the active journal transaction handle) and return 0 (VFS retry) to let the generic write path retry the operation safely.",
  "published": "2026-09-17T17:17:52Z",
  "severity": "important",
  "epss": 0.00219,
  "epssPercentile": 0.12477,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "ALAS2023-2026-3192",
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      "released": "2026-11-07T01:06:07Z"
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      "released": "2026-11-07T01:06:07Z"
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}