{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c6e3fd22cd538365bfeb82997d5b89562e077d42"
            },
            {
              "fixed": "fd339b9ef0accb2c24a5285df842552ebf5eb146"
            },
            {
              "fixed": "900cd6e5ef46bd15153762fb26bb03f874fccc52"
            },
            {
              "fixed": "6b39969c724d39b6062efa354dc2d38442bfd021"
            },
            {
              "fixed": "2e91ab73f9beb659f581e2a6a09f79ace1140905"
            },
            {
              "fixed": "d7deb90c4cd086cb111f0ecc9da021218fbde1b0"
            },
            {
              "fixed": "5310334762c3f08f51dc2414344dd47492c07d1d"
            },
            {
              "fixed": "ca4489b3e54666a7cac7294e71a3cf64e5e95286"
            },
            {
              "fixed": "6a19ad4d68c95185308cd9e5d169b10a2cf236c8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.37"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93053.json"
  },
  "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–z], 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–z] 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": "CVE-2026-93053",
  "modified": "2026-09-19T03:30:35.576417850Z",
  "published": "2026-09-17T16:10:42.397Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93053.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93053"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "speakup: keyhelp: guard letter_offsets possible out-of-range indexing"
}