CVE-2026-93053 (GCVE-0-2026-93053)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: speakup: keyhelp: guard letter_offsets possible out-of-range indexing help_init() builds letter_offsets[] by using the first byte of each function name as an index via `(start & 31) - 1`. If function_names are overridden from sysfs (root) with a name starting outside [a–z], the index underflows or exceeds the array, leading to OOB write. Function names can be overridden with the following commands as root: modprobe speakup_soft echo "0 _bad" > /sys/accessibility/speakup/i18n/function_names # then press Insert+2 on /dev/tty This fix checks the first letter in help_init(), and if it is not in the [a–z] range the function returns an error to the caller. Eventually this error is propagated to drivers/accessibility/speakup/main.c:2217, which causes a bleep sound.
References
Impacted products
Vendor Product Version
Linux Linux Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
Version: c6e3fd22cd538365bfeb82997d5b89562e077d42
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{
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          "programFiles": [
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: keyhelp: guard letter_offsets possible out-of-range indexing\n\nhelp_init() builds letter_offsets[] by using the first byte of each\nfunction name as an index via `(start \u0026 31) - 1`. If function_names are\noverridden from sysfs (root) with a name starting outside [a\u2013z], the\nindex underflows or exceeds the array, leading to OOB write.\n\nFunction names can be overridden with the following commands as root:\n\n    modprobe speakup_soft\n    echo \"0 _bad\" \u003e /sys/accessibility/speakup/i18n/function_names\n    # then press Insert+2 on /dev/tty\n\nThis fix checks the first letter in help_init(), and if it is not in the\n[a\u2013z] range the function returns an error to the caller. Eventually this\nerror is propagated to drivers/accessibility/speakup/main.c:2217, which\ncauses a bleep sound."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:48.197Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146"
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        {
          "url": "https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52"
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        {
          "url": "https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021"
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        {
          "url": "https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905"
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          "url": "https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0"
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        {
          "url": "https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d"
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          "url": "https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8"
        }
      ],
      "title": "speakup: keyhelp: guard letter_offsets possible out-of-range indexing",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93053",
    "datePublished": "2026-09-17T16:10:42.397Z",
    "dateReserved": "2026-09-17T15:57:05.658Z",
    "dateUpdated": "2026-10-19T09:04:48.197Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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