{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98446",
  "modified": "2026-10-19T04:30:01Z",
  "upstream": [
    "CVE-2026-98446"
  ],
  "published": "2026-10-18T15:22:13Z",
  "summary": "xfs: don't let hidden_space go negative in xfs_metafile_resv_init",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: don't let hidden_space go negative in xfs_metafile_resv_init\n\nLOLLM points out that if the amount of fdblocks that we can reserve for\na metadata btree file goes below the space already used by that file,\nthen the hidden_space subtraction can underflow, causing\nxfs_dec_fdblocks to subtract a huge amount of space.  We never want the\ntarget to be less than the used sapce, so fix the logic that adjusts\ndblocks_avail downwards.\n\nAlso fix an error in the adjacent comment.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
      "versions": [
        "1:6.18.29-1+rpt1",
        "1:6.18.33-1+rpt1",
        "1:6.18.34-1+rpt1",
        "1:6.18.39-1+rpt1",
        "1:6.18.50-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
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            "binary_name": "linux-image-6.18.29+rpt-rpi-2712",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
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            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v7",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v8",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.29-1+rpt1"
          },
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            "binary_name": "linux-image-6.18.33+rpt-rpi-2712",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
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            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-v7",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
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            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
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            "binary_version": "1:6.18.33-1+rpt1"
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          },
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          },
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            "binary_name": "linux-image-6.18.39+rpt-rpi-2712",
            "binary_version": "1:6.18.39-1+rpt1"
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          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v6",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v7",
            "binary_version": "1:6.18.39-1+rpt1"
          },
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          },
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            "binary_version": "1:6.18.39-1+rpt1"
          },
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          },
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            "binary_version": "1:6.18.50-1+rpt1"
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      },
      "database_specific": {
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            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.55"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.55"
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.55"
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98446"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/930a9c1c321efdaa3e7f8caecb0479cee3baf342"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0d8352a39f4a2e329ae45b71bb0d49e2ca0a6dc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/476582d754cdc5110f806001417fea6c77824c13"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-18T15:22:13Z"
  }
}