{
  "cveId": "CVE-2025-39723",
  "url": "https://patchblox.com/security/cve/CVE-2025-39723",
  "summary": "CVE-2025-39723 is fixed in 70 products on 1 platform, first by DEBIAN-CVE-2025-39723, released September 5, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix unbuffered write error handling  If a...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  netfs: Fix unbuffered write error handling  If all the subrequests in an unbuffered write stream fail, the subrequest collector doesn\u0027t update the stream-\u003Etransferred value and it retains its initial LONG_MAX value.  Unfortunately, if all active streams fail, then we take the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set in wreq-\u003Etransferred - which is then returned from -\u003Ewrite_iter().  LONG_MAX was chosen as the initial value so that all the streams can be quickly assessed by taking the smallest value of all stream-\u003Etransferred - but this only works if we\u0027ve set any of them.  Fix this by adding a flag to indicate whether the value in stream-\u003Etransferred is valid and checking that when we integrate the values.  stream-\u003Etransferred can then be initialised to zero.  This was found by running the generic/750 xfstest against cifs with cache=none.  It splices data to the target file.  Once (if) it has used up all the available scratch space, the writes start failing with ENOSPC. This causes -\u003Ewrite_iter() to fail.  However, it was returning wreq-\u003Etransferred, i.e. LONG_MAX, rather than an error (because it thought the amount transferred was non-zero) and iter_file_splice_write() would then try to clean up that amount of pipe bufferage - leading to an oops when it overran.  The kernel log showed:      CIFS: VFS: Send error in write = -28  followed by:      BUG: kernel NULL pointer dereference, address: 0000000000000008  with:      RIP: 0010:iter_file_splice_write\u002B0x3a4/0x520     do_splice\u002B0x197/0x4e0  or:      RIP: 0010:pipe_buf_release (include/linux/pipe_fs_i.h:282)     iter_file_splice_write (fs/splice.c:755)  Also put a warning check into splice to announce if -\u003Ewrite_iter() returned that it had written more than it was asked to.",
  "published": "2025-09-05T18:15:50Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00243,
  "epssPercentile": 0.15556,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}