GHSA-WQW9-PM7J-M5RF

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93053"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:58Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-wqw9-pm7j-m5rf",
  "modified": "2026-09-17T18:32:08Z",
  "published": "2026-09-17T18:32:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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