CVE-2026-93053 — speakup: keyhelp: guard letter_offsets possible out-of-range indexing
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.2% (30-day exploitation probability)+1
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < fd339b9ef0accb2c24a5285df842552ebf5eb146≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < 900cd6e5ef46bd15153762fb26bb03f874fccc52≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < 6b39969c724d39b6062efa354dc2d38442bfd021≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < 2e91ab73f9beb659f581e2a6a09f79ace1140905≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < d7deb90c4cd086cb111f0ecc9da021218fbde1b0≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < 5310334762c3f08f51dc2414344dd47492c07d1d≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < ca4489b3e54666a7cac7294e71a3cf64e5e95286≥ c6e3fd22cd538365bfeb82997d5b89562e077d42 and < 6a19ad4d68c95185308cd9e5d169b10a2cf236c8 and 1 moreversion 2.6.37 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
EPSS over time FIRST
Oct 15, 2026 → Oct 16, 2026 · 2 reading(s) · max 0.18%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Not enough vector or weakness data: use the affected application’s logs as a starting point.
Timeline
What happened to this CVE, newest first.
- 2026
- Record published
- Affected products added · linux/linux
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
8 on the record
- git.kernel.org/stable/c/5310334762c3f08f51dc2414344dd47492c07d1d
- git.kernel.org/stable/c/900cd6e5ef46bd15153762fb26bb03f874fccc52
- git.kernel.org/stable/c/6a19ad4d68c95185308cd9e5d169b10a2cf236c8
- git.kernel.org/stable/c/fd339b9ef0accb2c24a5285df842552ebf5eb146
- git.kernel.org/stable/c/6b39969c724d39b6062efa354dc2d38442bfd021
- git.kernel.org/stable/c/ca4489b3e54666a7cac7294e71a3cf64e5e95286
- git.kernel.org/stable/c/d7deb90c4cd086cb111f0ecc9da021218fbde1b0
- git.kernel.org/stable/c/2e91ab73f9beb659f581e2a6a09f79ace1140905
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 2d
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 2d
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 3d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 3d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 3d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 3d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No CVSS score published by NVD, the CNA, CISA or GitHub so far.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No CWE classification.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-93053 is "speakup: keyhelp: guard letter_offsets possible out-of-range indexing", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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