---
id: CVE-2026-93053
title: |-
  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…
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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    fd339b9ef0accb2c24a5285df842552ebf5eb146
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    900cd6e5ef46bd15153762fb26bb03f874fccc52
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    6b39969c724d39b6062efa354dc2d38442bfd021
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    2e91ab73f9beb659f581e2a6a09f79ace1140905
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    d7deb90c4cd086cb111f0ecc9da021218fbde1b0
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    5310334762c3f08f51dc2414344dd47492c07d1d
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    ca4489b3e54666a7cac7294e71a3cf64e5e95286
  - >-
    Linux >= c6e3fd22cd538365bfeb82997d5b89562e077d42 <
    6a19ad4d68c95185308cd9e5d169b10a2cf236c8
  - Linux 2.6.37
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:58.783'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93053'
references:
  - url: 'https://git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.770Z'
epss: 0.00176
epssPercentile: 0.07439
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.