{
  "cveId": "CVE-2026-89768",
  "url": "https://patchblox.com/security/cve/CVE-2026-89768",
  "summary": "CVE-2026-89768 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-89768, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "fs: fix user path of nested backing files",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fs: fix user path of nested backing files  backing_file_open() derives the path to be stored in the new backing file from user_file-\u003Ef_path.  This is incorrect when user_file itself is a backing file, which is the case for nested stacking filesystems, e.g. overlayfs mounts where the lowerdir of one overlayfs is the merged directory of another.  Since commit def3ae83da02 (\u0022fs: store real path instead of fake path in backing file f_path\u0022) the f_path of a backing file holds the real path of the intermediate layer, not the path that the user opened.  Commit 924577e4f6ca (\u0022ovl: Fix nested backing file paths\u0022) fixed this for such configurations by passing file_user_path() from ovl_open_realfile().  However, commit 6af36aeb147a (\u0022lsm: add backing_file LSM hooks\u0022) changed the first argument of backing_file_open() from the user path back to the user file and derived the path from user_file-\u003Ef_path again, silently re-introducing the problem.  As a result, files mapped through a nested overlayfs show the wrong path in /proc/\u003Cpid\u003E/maps and in perf/ftrace mmap records.  For example, with two nested overlayfs mounts:    mkdir -p /ovl/{lower,upper,work,merged} /ovl/nested   echo hello \u003E /ovl/lower/foo   mount -t overlay overlay \\ \t-o lowerdir=/ovl/lower,upperdir=/ovl/upper,workdir=/ovl/work \\ \t/ovl/merged   # at least two lowerdirs are needed when upperdir is nonexistent   mount -t overlay overlay \\ \t-o lowerdir=/ovl/merged:/ovl/lower /ovl/nested  mapping /ovl/nested/foo shows a disconnected path instead of the user path:    # readlink /proc/self/fd/3   /ovl/nested/foo   # grep foo /proc/self/maps   7f6e2c100000-7f6e2c101000 r--s 00000000 00:24 15813027 /foo  The bogus path is derived from the f_path of the intermediate backing file, whose mount is a private clone that d_path() cannot resolve.  Fix this by using file_user_path(), which returns the outermost user-visible path for backing files and falls back to \u0026user_file-\u003Ef_path for regular files.  This restores the behavior of commit 924577e4f6ca (\u0022ovl: Fix nested backing file paths\u0022) for overlayfs and also fixes the same problem for the other backing_file_open() callers, fuse passthrough and erofs ishare, when their user file is itself a backing file.  backing_tmpfile_open() has the same pattern but is not affected: it is only called by ovl_create_tmpfile() for the upper layer, and another overlayfs is rejected as upperdir by the DCACHE_OP_REAL check in ovl_mount_dir_check(), so its user_file can never be a backing file.",
  "published": "2026-09-11T20:20:08Z",
  "severity": "Low",
  "cvss": 3.3,
  "epss": 0.00191,
  "epssPercentile": 0.08862,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89768",
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      "fixedVersion": "1:6.18.51-120.162.amzn2023",
      "fix": "ALAS2023-2026-3187",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "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"
  }
}