CVE-2025-20799: 
NixOS vulnerability analysis and mitigation

CVE-2025-20799 is a use-after-free memory corruption vulnerability in the c2ps component of MediaTek-powered Android devices. It allows a local attacker who has already obtained System-level privileges to further escalate privileges without requiring user interaction. The vulnerability affects Android 15.0 and 16.0 running on MediaTek processors MT6899, MT6991, MT6993, and MT8793. It was published on January 5–6, 2026, with a patch released in MediaTek's January 2026 security bulletin. The CVSS v3.1 base score is 7.8 (High), assessed by CISA-ADP (MediaTek Advisory, Red Hat CVE).

The vulnerability is classified as CWE-416 (Use After Free), occurring in the c2ps component — a media codec processing service on MediaTek chipsets. A use-after-free condition arises when memory that has been freed is subsequently accessed, potentially allowing an attacker to corrupt memory and redirect code execution. Exploitation requires local access with at least low-level privileges, but the attacker must have already obtained System-level privilege to trigger the escalation path. The patch is identified as ALPS10274607 (Issue ID: MSV-5049) (MediaTek Advisory).

Successful exploitation results in high impact to confidentiality, integrity, and availability of the affected device. An attacker with System privilege who exploits this vulnerability could achieve arbitrary code execution at an elevated privilege level, potentially compromising the entire device and all data stored on it. The scope is limited to the local device (no network propagation), but full device compromise — including access to sensitive user data and persistent control — is a realistic outcome (MediaTek Advisory, Red Hat CVE).

There is no public proof-of-concept exploit available, and no evidence of in-the-wild exploitation has been observed as of the time of publication. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.018% (0.000180), indicating a very low probability of exploitation in the near term. No threat actor attribution has been reported (MediaTek Advisory).

MediaTek has released a patch addressing this vulnerability, identified as Patch ID ALPS10274607, published in the MediaTek January 2026 Product Security Bulletin. Device manufacturers (OEMs) are expected to incorporate this patch into their own security updates; users should apply the latest available security updates for their devices. Lenovo has also published a vendor advisory for affected MediaTek-based tablets (Lenovo Advisory). As a compensating control, strictly enforce System-level access controls and limit the attack surface by restricting which applications or processes can obtain System privileges.

The vulnerability received limited but notable coverage from security news aggregators and social media accounts. TheHackerWire shared information about the vulnerability on both Mastodon (infosec.exchange) and Bluesky shortly after disclosure. Lenovo issued a dedicated vendor advisory for its MediaTek-based tablet products affected by this and related January 2026 MediaTek vulnerabilities (Lenovo Advisory). No significant independent researcher commentary or major media coverage has been identified.