{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43118",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43118"
  ],
  "published": "2026-05-06T07:41:37Z",
  "summary": "btrfs: fix zero size inode with non-zero size after log replay",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix zero size inode with non-zero size after log replay\n\nWhen logging that an inode exists, as part of logging a new name or\nlogging new dir entries for a directory, we always set the generation of\nthe logged inode item to 0. This is to signal during log replay (in\noverwrite_item()), that we should not set the i_size since we only logged\nthat an inode exists, so the i_size of the inode in the subvolume tree\nmust be preserved (as when we log new names or that an inode exists, we\ndon't log extents).\n\nThis works fine except when we have already logged an inode in full mode\nor it's the first time we are logging an inode created in a past\ntransaction, that inode has a new i_size of 0 and then we log a new name\nfor the inode (due to a new hardlink or a rename), in which case we log\nan i_size of 0 for the inode and a generation of 0, which causes the log\nreplay code to not update the inode's i_size to 0 (in overwrite_item()).\n\nAn example scenario:\n\n  mkdir /mnt/dir\n  xfs_io -f -c \"pwrite 0 64K\" /mnt/dir/foo\n\n  sync\n\n  xfs_io -c \"truncate 0\" -c \"fsync\" /mnt/dir/foo\n\n  ln /mnt/dir/foo /mnt/dir/bar\n\n  xfs_io -c \"fsync\" /mnt/dir\n\n  <power fail>\n\nAfter log replay the file remains with a size of 64K. This is because when\nwe first log the inode, when we fsync file foo, we log its current i_size\nof 0, and then when we create a hard link we log again the inode in exists\nmode (LOG_INODE_EXISTS) but we set a generation of 0 for the inode item we\nadd to the log tree, so during log replay overwrite_item() sees that the\ngeneration is 0 and i_size is 0 so we skip updating the inode's i_size\nfrom 64K to 0.\n\nFix this by making sure at fill_inode_item() we always log the real\ngeneration of the inode if it was logged in the current transaction with\nthe i_size we logged before. Also if an inode created in a previous\ntransaction is logged in exists mode only, make sure we log the i_size\nstored in the inode item located from the commit root, so that if we log\nmultiple times that the inode exists we get the correct i_size.\n\nA test case for fstests will follow soon.",
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