{
  "cveId": "CVE-2024-50250",
  "url": "https://patchblox.com/security/cve/CVE-2024-50250",
  "summary": "CVE-2024-50250 is fixed in 34 products on 1 platform, first by DEBIAN-CVE-2024-50250, released November 9, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  fsdax: dax_unshare_iter needs to copy entire blo...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fsdax: dax_unshare_iter needs to copy entire blocks  The code that copies data from srcmap to iomap in dax_unshare_iter is very very broken, which bfoster\u0027s recent fsx changes have exposed.  If the pos and len passed to dax_file_unshare are not aligned to an fsblock boundary, the iter pos and length in the _iter function will reflect this unalignment.  dax_iomap_direct_access always returns a pointer to the start of the kmapped fsdax page, even if its pos argument is in the middle of that page.  This is catastrophic for data integrity when iter-\u003Epos is not aligned to a page, because daddr/saddr do not point to the same byte in the file as iter-\u003Epos.  Hence we corrupt user data by copying it to the wrong place.  If iter-\u003Epos \u002B iomap_length() in the _iter function not aligned to a page, then we fail to copy a full block, and only partially populate the destination block.  This is catastrophic for data confidentiality because we expose stale pmem contents.  Fix both of these issues by aligning copy_pos/copy_len to a page boundary (remember, this is fsdax so 1 fsblock == 1 base page) so that we always copy full blocks.  We\u0027re not done yet -- there\u0027s no call to invalidate_inode_pages2_range, so programs that have the file range mmap\u0027d will continue accessing the old memory mapping after the file metadata updates have completed.  Be careful with the return value -- if the unshare succeeds, we still need to return the number of bytes that the iomap iter thinks we\u0027re operating on.",
  "published": "2024-11-09T11:15:10Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00228,
  "epssPercentile": 0.13683,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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