« Volver al listado

CVE-2026-93053

Estado: RecibidaSin puntuar—

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:

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.

Detalles técnicos trazas, registros y código del informe original
    modprobe speakup_soft
    echo "0 _bad" > /sys/accessibility/speakup/i18n/function_names
    # then press Insert+2 on /dev/tty

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-93053",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "fd339b9ef0accb2c24a5285df842552ebf5eb146",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "900cd6e5ef46bd15153762fb26bb03f874fccc52",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "6b39969c724d39b6062efa354dc2d38442bfd021",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "2e91ab73f9beb659f581e2a6a09f79ace1140905",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "d7deb90c4cd086cb111f0ecc9da021218fbde1b0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "5310334762c3f08f51dc2414344dd47492c07d1d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "ca4489b3e54666a7cac7294e71a3cf64e5e95286",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
              "lessThan": "6a19ad4d68c95185308cd9e5d169b10a2cf236c8",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/accessibility/speakup/keyhelp.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.37"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.37",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/accessibility/speakup/keyhelp.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:58.783",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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 & 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\" > /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."
    }
  ],
  "lastModified": "2026-09-17T17:17:58.783",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}