CVE-2026-21067 in Samsung
Summary
by MITRE • 08/10/2026
Improper input validation in libsmsd.so prior to SMR Aug-2026 Release 1 allows local attackers to write out-of-bounds memory.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability described represents a critical memory safety issue within the libsmsd.so library component that affects systems prior to the SMR August 2026 security release. This flaw manifests as improper input validation that enables local attackers to execute out-of-bounds memory writes, potentially leading to system compromise and arbitrary code execution. The vulnerability falls under the category of buffer overflow conditions where insufficient validation occurs on input data before being processed by the smsd service daemon.
The technical implementation of this vulnerability stems from inadequate bounds checking within the libsmsd.so library functions that handle incoming data streams from local processes or users. When legitimate input is received, the system fails to properly validate array indices or buffer limits, allowing malicious actors to manipulate memory layout through crafted inputs. This type of flaw commonly occurs when developers assume input data conforms to expected formats without implementing comprehensive validation mechanisms. The vulnerability specifically impacts systems running versions prior to the August 2026 security update, indicating that the issue was likely identified and patched in subsequent releases.
From an operational perspective, this vulnerability creates significant risk for local attackers who can leverage it to gain elevated privileges or cause system instability. The out-of-bounds memory write capability enables potential exploitation through various attack vectors including privilege escalation, denial of service conditions, or even remote code execution if the service is accessible from untrusted networks. Security analysts should note that local privilege escalation attacks exploiting such vulnerabilities often align with tactics described in the MITRE ATT&CK framework under privilege escalation techniques. The vulnerability's impact is particularly concerning because it requires only local access to exploit, making it more accessible than network-based attacks that require additional reconnaissance or attack surface exposure.
Organizations should prioritize immediate remediation by applying the SMR August 2026 security update or implementing equivalent mitigations such as input validation patches and system hardening measures. The underlying CWE classification for this vulnerability would likely fall under CWE-121, which describes heap-based buffer overflow conditions, or potentially CWE-787, which covers out-of-bounds write vulnerabilities. Additionally, implementing proper memory sanitization tools, address space layout randomization, and stack canaries can provide additional defense-in-depth measures against exploitation attempts. System administrators should also consider monitoring for suspicious local process behavior and implement least privilege principles to limit potential impact if exploitation occurs.