CVE-2026-89726 (GCVE-0-2026-89726)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-19 08:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen() Patch series "lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()", v2. This series fixes an off-by-one out-of-bounds read in ucs2_strnlen(). The first patch is the real fix, the second patch comes as a bonus and fixes the code indentation. This patch (of 2): ucs2_strnlen() checks the current character before checking whether the caller-provided maximum length has been reached. If the input is not NUL-terminated within that bound, the loop can read one ucs2_char_t past the limit. Test the length before dereferencing to prevent an off-by-one out-of-bounds read.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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          "programFiles": [
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()\n\nPatch series \"lib/ucs2_string.c: fix out-of-bounds read in\nucs2_strnlen()\", v2.\n\nThis series fixes an off-by-one out-of-bounds read in ucs2_strnlen().\n\nThe first patch is the real fix, the second patch comes as a bonus and\nfixes the code indentation.\n\n\nThis patch (of 2):\n\nucs2_strnlen() checks the current character before checking whether the\ncaller-provided maximum length has been reached.  If the input is not\nNUL-terminated within that bound, the loop can read one ucs2_char_t past\nthe limit.\n\nTest the length before dereferencing to prevent an off-by-one\nout-of-bounds read."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:51:39.437Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/04ae68af4107600120c3c41c94268f43bc350d48"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e5a70a175f0c74e7238b013a96c4eabc3002934"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ada20e110bf3245edb0a3bcddadc33d0f142f8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/60c74f42f5abddb85dd919b4448d5474e65dbe76"
        },
        {
          "url": "https://git.kernel.org/stable/c/709eb41adaf78d59d4579a13a898125919b69bcc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d658da725ea81c91f73087547b97e7ced82d62b"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b0dc3cbb8630f0b5cb34d848628225920a904be"
        },
        {
          "url": "https://git.kernel.org/stable/c/cec0d03fe785380540dc1b4d07c80f67ae2ffc78"
        }
      ],
      "title": "lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89726",
    "datePublished": "2026-09-11T19:46:37.480Z",
    "dateReserved": "2026-09-11T19:38:34.759Z",
    "dateUpdated": "2026-10-19T08:51:39.437Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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