SB2026081519 - Stack-based buffer overflow in Linux kernel allwinner sun4i-ss driver

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Main Vulnerability Database SB2026081519

SB2026081519 - Stack-based buffer overflow in Linux kernel allwinner sun4i-ss driver

Published: August 15, 2026

Security Bulletin ID SB2026081519
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Stack-based buffer overflow (CVE-ID: CVE-2026-74438)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to execute arbitrary code or cause a denial of service.

The vulnerability exists due to a stack-based buffer overflow in sun4i_ss_prng_seed() in the sun4i_ss_prng rng implementation when processing a seed supplied through the AF_ALG "rng" algorithm interface. A local user can supply an oversized seed to trigger memory corruption and execute arbitrary code or cause a denial of service.

The vulnerable code path is described as only theoretically usable via the "rng" algorithm type of AF_ALG.


Remediation

Install update from vendor's website.

References