CVE-2026-98636 (GCVE-0-2026-98636)
Vulnerability from cvelistv5
Published
2026-10-18 15:20
Modified
2026-10-19 09:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: squashfs: Add dictionary size range check to prevent shift-out-of-bounds When an abnormal SquashFS image (COMP_OPTS flag is 1 but dictionary size is 0) is mounted, and performs shift operations using dictionarysize, the shift exponent is -1, causing a shift-out-of-bounds. Detail as below: squashfs_comp_opts(msblk, buffer, length) squashfs_xz_comp_opts() if (comp_opts) n = ffs(opts->dict_size) - 1;<----opts->dict_size=0, n=-1 if (opts->dict_size != (1 << n) && opts->dict_size != (1 << n) + (1 << (n + 1))) <----shift-out-of-bounds Fix it by adding a dictionary size range check before the shift operation.
References
Impacted products
Vendor Product Version
Linux Linux Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
Version: ff750311d30acc9564ef577050794953eee59f01
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsquashfs: Add dictionary size range check to prevent shift-out-of-bounds\n\nWhen an abnormal SquashFS image (COMP_OPTS flag is 1 but dictionary size\nis 0) is mounted, and performs shift operations using dictionarysize, the\nshift exponent is -1, causing a shift-out-of-bounds.\n\nDetail as below:\nsquashfs_comp_opts(msblk, buffer, length)\n  squashfs_xz_comp_opts()\n    if (comp_opts)\n      n = ffs(opts-\u003edict_size) - 1;\u003c----opts-\u003edict_size=0, n=-1\n      if (opts-\u003edict_size != (1 \u003c\u003c n) \u0026\u0026 opts-\u003edict_size !=\n\t  \t(1 \u003c\u003c n) + (1 \u003c\u003c (n + 1))) \u003c----shift-out-of-bounds\n\nFix it by adding a dictionary size range check before the shift operation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:06.005Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1"
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        {
          "url": "https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1"
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        {
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        {
          "url": "https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0"
        }
      ],
      "title": "squashfs: Add dictionary size range check to prevent shift-out-of-bounds",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98636",
    "datePublished": "2026-10-18T15:20:07.184Z",
    "dateReserved": "2026-09-25T10:25:14.361Z",
    "dateUpdated": "2026-10-19T09:23:06.005Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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