CVE-2026-74438

Kernel memory corruption via unchecked PRNG seed length

Published Aug 15, 2026 · Updated Aug 15, 2026

Buffer overflow in the sun4i-ss PRNG in Linux allows local users to corrupt kernel memory through an AF_ALG seed request. sun4i_ss_prng_seed() accepts seed data without locking and overflows its buffer, while the generator truncates output and reads hardware before readiness. Reachability requires local access to the theoretical AF_ALG rng interface on an affected Allwinner sun4i-ss build; no code users are known, and the interface does not feed the system RNG.

CVSS severity7.3
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the sun4i-ss PRNG in Linux allows local users to corrupt kernel memory through an AF_ALG seed request. sun4i_ss_prng_seed() accepts seed data without locking and overflows its buffer, while the generator truncates output and reads hardware before readiness. Reachability requires local access to the theoretical AF_ALG rng interface on an affected Allwinner sun4i-ss build; no code users are known, and the interface does not feed the system RNG.

The record

CVE
CVE-2026-74438
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.14
  2. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <2eafecaba1b46bb9774eaf3556619fd5b6a17c1c
  3. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <306ded31bfa00a69d25823a60d7c797170bfb4f8
  4. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <9c8086d9511189c34dfa3f9e3a03f2bee12f56a5
  5. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <b2c41fa9dd8fc740c489e060b199165771f268d1
  6. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <c401492e01c7bfd38cf14c94d85c7efafe7d1a25
  7. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <e4b7b9819811c4c51064c3d3d3c02f0be7491707
  8. Affected versionversion=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <ee2458f8188732aa53a5d42f56e87bfad288b44e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <2eafecaba1b46bb9774eaf3556619fd5b6a17c1c; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <306ded31bfa00a69d25823a60d7c797170bfb4f8; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <9c8086d9511189c34dfa3f9e3a03f2bee12f56a5; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <b2c41fa9dd8fc740c489e060b199165771f268d1; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <c401492e01c7bfd38cf14c94d85c7efafe7d1a25; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <e4b7b9819811c4c51064c3d3d3c02f0be7491707; version=b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 <ee2458f8188732aa53a5d42f56e87bfad288b44e

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3UbuntuCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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