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btrfs: avoid potential out-of-bounds in btrfs_encode_fh()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: btrfs: avoid potential out-of-bounds in btrfs_encode_fh() The function btrfs_encode_fh() does not properly account for the three cases it handles. Before writing to the file handle (fh), the function only returns to the user BTRFS_FID_SIZE_NON_CONNECTABLE (5 dwords, 20 bytes) or BTRFS_FID_SIZE_CONNECTABLE (8 dwords, 32 bytes). However, when a parent exists and the root ID of the parent and the inode are different, the function writes BTRFS_FID_SIZE_CONNECTABLE_ROOT (10 dwords, 40 bytes). If *max_len is not large enough, this write goes out of bounds because BTRFS_FID_SIZE_CONNECTABLE_ROOT is greater than BTRFS_FID_SIZE_CONNECTABLE originally returned. This results in an 8-byte out-of-bounds write at fid->parent_root_objectid = parent_root_id. A previous attempt to fix this issue was made but was lost. https://lore.kernel.org/all/4CADAEEC020000780001B32C@vpn.id2.novell.com/ Although this issue does not seem to be easily triggerable, it is a potential memory corruption bug that should be fixed. This patch resolves the issue by ensuring the function returns the appropriate size for all three cases and validates that *max_len is large enough before writing any data.

Announced Group revision 1
Original source ↗

CVE-2025-40205

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-40205

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "60de2f55d2aca53e81b4ef2a67d7cc9e1eb677db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "742b44342204e5dfe3926433823623c1a0c581df",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "d3a9a8e1275eb9b87f006b5562a287aea3f6885f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "d91f6626133698362bba08fbc04bd72c466806d3",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "0276c8582488022f057b4cec21975a5edf079f47",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "361d67276eb8ec6be8f27f4ad6c6090459438fee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "43143776b0a7604d873d1a6f3e552a00aa930224",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "be6e8dc0ba84029997075a1ec77b4ddb863cbe15",
        "lessThan": "dff4f9ff5d7f289e4545cc936362e01ed3252742",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/btrfs/export.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.301",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.246",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.195",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/btrfs/export.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-40205

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30694 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2025-40205 · Revision 1Source updated