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CVE-2026-93053· NVD / CVE Program· CNA Linux

speakup: keyhelp: guard letter_offsets possible out-of-range indexing

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 2e91ab73f9beb659f581e2a6a09f79ace1140905, 5310334762c3f08f51dc2414344dd47492c07d1d, 6a19ad4d68c95185308cd9e5d169b10a2cf236c8.

Low priority for now. Upgrade to Linux Linux 2e91ab73f9beb659f581e2a6a09f79ace1140905, 5310334762c3f08f51dc2414344dd47492c07d1d, 6a19ad4d68c95185308cd9e5d169b10a2cf236c8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Sep 17, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.37affected
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before fd339b9ef0accb2c24a5285df842552ebf5eb146affected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before 900cd6e5ef46bd15153762fb26bb03f874fccc52affected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before 6b39969c724d39b6062efa354dc2d38442bfd021affected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before 2e91ab73f9beb659f581e2a6a09f79ace1140905affected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before d7deb90c4cd086cb111f0ecc9da021218fbde1b0affected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before 5310334762c3f08f51dc2414344dd47492c07d1daffected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before ca4489b3e54666a7cac7294e71a3cf64e5e95286affected · git
    • c6e3fd22cd538365bfeb82997d5b89562e077d42 and later · before 6a19ad4d68c95185308cd9e5d169b10a2cf236c8affected · git
    • before 2.6.37not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxall versions—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2e91ab73f9beb659f581e2a6a09f79ace1140905Vendor (CNA)
Linux Linux5310334762c3f08f51dc2414344dd47492c07d1dVendor (CNA)
Linux Linux6a19ad4d68c95185308cd9e5d169b10a2cf236c8Vendor (CNA)
Linux Linux6b39969c724d39b6062efa354dc2d38442bfd021Vendor (CNA)
Linux Linux900cd6e5ef46bd15153762fb26bb03f874fccc52Vendor (CNA)
Linux Linuxca4489b3e54666a7cac7294e71a3cf64e5e95286Vendor (CNA)
Linux Linuxd7deb90c4cd086cb111f0ecc9da021218fbde1b0Vendor (CNA)
Linux Linuxfd339b9ef0accb2c24a5285df842552ebf5eb146Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records