CVE-2026-93053Public exploitHinoki check available

Kernel memory corruption via unchecked help-name indexing

Published Sep 17, 2026 · Updated Sep 17, 2026

Out-of-bounds writing in Linux 2.6.37 Speakup allows local users to corrupt kernel memory via malformed function names. In drivers/accessibility/speakup/keyhelp.c, help_init() indexes letter_offsets with (start & 31) - 1 without validating the first byte of a sysfs-overridden function name. Triggering requires root access to change function_names and activation of Speakup help on a terminal; the disclosure establishes an out-of-bounds write, not a demonstrated privilege escalation or specific crash outcome.

CVSS severity3.4
Low
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds writing in Linux 2.6.37 Speakup allows local users to corrupt kernel memory via malformed function names. In drivers/accessibility/speakup/keyhelp.c, help_init() indexes letter_offsets with (start & 31) - 1 without validating the first byte of a sysfs-overridden function name. Triggering requires root access to change function_names and activation of Speakup help on a terminal; the disclosure establishes an out-of-bounds write, not a demonstrated privilege escalation or specific crash outcome.

The record

CVE
CVE-2026-93053
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.37
  2. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <2e91ab73f9beb659f581e2a6a09f79ace1140905
  3. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <5310334762c3f08f51dc2414344dd47492c07d1d
  4. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <6a19ad4d68c95185308cd9e5d169b10a2cf236c8
  5. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <6b39969c724d39b6062efa354dc2d38442bfd021
  6. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <900cd6e5ef46bd15153762fb26bb03f874fccc52
  7. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <ca4489b3e54666a7cac7294e71a3cf64e5e95286
  8. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <d7deb90c4cd086cb111f0ecc9da021218fbde1b0
  9. Affected versionversion=c6e3fd22cd538365bfeb82997d5b89562e077d42 <fd339b9ef0accb2c24a5285df842552ebf5eb146

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.37; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <2e91ab73f9beb659f581e2a6a09f79ace1140905; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <5310334762c3f08f51dc2414344dd47492c07d1d; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <6a19ad4d68c95185308cd9e5d169b10a2cf236c8; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <6b39969c724d39b6062efa354dc2d38442bfd021; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <900cd6e5ef46bd15153762fb26bb03f874fccc52; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <ca4489b3e54666a7cac7294e71a3cf64e5e95286; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <d7deb90c4cd086cb111f0ecc9da021218fbde1b0; version=c6e3fd22cd538365bfeb82997d5b89562e077d42 <fd339b9ef0accb2c24a5285df842552ebf5eb146

Published CVSS scores

3.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
3.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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