GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

FKIE_CVE-2026-93053

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146
Impacted products
Vendor Product Version
To clipboard 

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



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.