CVE-2024-38587 — speakup: Fix sizeof() vs ARRAY_SIZE() bug
In the Linux kernel, the following vulnerability has been resolved: speakup: Fix sizeof() vs ARRAY_SIZE() bug The "buf" pointer is an array of u16 values. This code should be using ARRAY_SIZE() (which is 256) instead of sizeof() (which is 512), otherwise it can the still got out of bounds.
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 0.8% (30-day exploitation probability)+8
- Technical severity (high)+6
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.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
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, Linux Linux Kernel).
- Apply the fixed version or the patch documented under Remediation.
- 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 |
≥ 89af25bd4b4bf6a71295f07e07a8ae7dc03c6595 and < 3726f75a1ccc16cd335c0ccfad1d92ee08ecba5eversion 6.9≥ 6.8.8 and < 6.8.12≥ 6.6.29 and < 6.6.33≥ 6.1.88 and < 6.1.93≥ 5.15.157 and < 5.15.161≥ 5.10.216 and < 5.10.219≥ 5.4.275 and < 5.4.278 and 9 more≥ 4.19.313 and < 4.19.316≥ c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1 and < 008ab3c53bc4f0b2f20013c8f6c204a3203d0b8b≥ c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1 and < d52c04474feac8e305814a5228e622afe481b2ef≥ 0efb15c14c493263cb3a5f65f5ddfd4603d19a76 and < eb1ea64328d4cc7d7a912c563f8523d5259716ef≥ 8defb1d22ba0395b81feb963b96e252b097ba76f and < c6e1650cf5df1bd6638eeee231a683ef30c7d4eb≥ 0d130158db29f5e0b3893154908cf618896450a8 and < 504178fb7d9f6cdb0496d5491efb05f45597e535≥ 6401038acfa24cba9c28cce410b7505efadd0222 and < 07ef95cc7a579731198c93beed281e3a79a0e586≥ 8f6b62125befe1675446923e4171eac2c012959c and < cd7f3978c2ec741aedd1d860b2adb227314cf996≥ 756c5cb7c09e537b87b5d3acafcb101b2ccf394f and < 42f0a3f67158ed6b2908d2b9ffbf7e96d23fd358 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel | ≥ 4.19.313 and < 4.19.316≥ 6.9 and < 6.9.3≥ 6.8.8 and < 6.8.12≥ 6.6.29 and < 6.6.33≥ 6.1.88 and < 6.1.93≥ 5.15.157 and < 5.15.161≥ 5.10.216 and < 5.10.219≥ 5.4.275 and < 5.4.278 | Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 7.8 | CVSS 3.1 | High | 1.8 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database |
| 7.8 | CVSS 3.1 | High | — | — | Linux via CVE Program (cve.org) e CISA ADP |
| 5.3 | CVSS 3.1 | Medium | 3.9 | 1.4 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database |
| 5.3 | CVSS 3.1 | Medium | — | — | CISA-ADP via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- SSVC assessment updated
- Record published
- Fix documented
- CVSS changed · 7.8
- Source status changed · → Modified
- Record created in this database
- 2024
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 14, 2026 – Oct 14, 2026
References
12 on the record
- git.kernel.org/stable/c/cd7f3978c2ec741aedd1d860b2adb227314cf996
- git.kernel.org/stable/c/008ab3c53bc4f0b2f20013c8f6c204a3203d0b8b
- git.kernel.org/stable/c/3726f75a1ccc16cd335c0ccfad1d92ee08ecba5e
- git.kernel.org/stable/c/d52c04474feac8e305814a5228e622afe481b2ef
- git.kernel.org/stable/c/504178fb7d9f6cdb0496d5491efb05f45597e535
- git.kernel.org/stable/c/c6e1650cf5df1bd6638eeee231a683ef30c7d4eb
- git.kernel.org/stable/c/07ef95cc7a579731198c93beed281e3a79a0e586
- git.kernel.org/stable/c/eb1ea64328d4cc7d7a912c563f8523d5259716ef
- git.kernel.org/stable/c/42f0a3f67158ed6b2908d2b9ffbf7e96d23fd358
- cert-portal.siemens.com/productcert/html/ssa-613116.html
- lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- cert-portal.siemens.com/productcert/html/ssa-265688.html
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 7h
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 7h
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d
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 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-2024-38587 is "speakup: Fix sizeof() vs ARRAY_SIZE() bug", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 0.79% 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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