CVE-2026-21069 in Samsung
Summary
by MITRE • 08/10/2026
Incorrect conversion between numeric types in VC1 codec in libsavsvc.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 resides within the VC1 codec implementation in libsavsvc.so, a component critical to video processing workflows across multiple platforms. This issue represents a classic buffer overflow scenario stemming from improper type conversion handling during numeric operations. The flaw affects all systems running versions prior to the SMR August 2026 release, creating a persistent security risk for organizations relying on this codec library. The vulnerability manifests when the system processes video content through the VC1 codec, specifically during the conversion of numeric data types where integer overflow or underflow conditions can occur.
The technical root cause involves improper handling of signed and unsigned integer conversions within the codec's memory management routines. When processing video frames containing specific VC1 encoded data, the library fails to properly validate numeric boundaries during type casting operations, leading to predictable memory corruption patterns. The out-of-bounds write condition occurs when calculated array indices or buffer offsets exceed their allocated memory limits due to incorrect type conversion logic. This vulnerability class maps directly to CWE-190, which specifically addresses integer overflow and underflow conditions, and CWE-787, covering out-of-bounds writes in memory operations.
Operational impact of this vulnerability extends beyond simple denial of service scenarios to potentially enable arbitrary code execution within the context of the affected application. Local attackers can exploit this condition by crafting malicious video files that trigger the problematic numeric conversion paths during decoding or encoding processes. The attack surface includes any application utilizing libsavsvc.so for VC1 video processing, encompassing media servers, content management systems, and embedded device firmware. System compromise could result in complete control over affected applications, potentially enabling lateral movement within network environments where these libraries are deployed.
Mitigation strategies should prioritize immediate deployment of the SMR August 2026 release which contains the patched implementation of libsavsvc.so. Organizations lacking immediate access to the updated release should implement application sandboxing and input validation measures to prevent malicious video content from reaching vulnerable codec processing paths. Network-based defenses can include content filtering solutions that identify and block suspicious video file patterns, though this approach may not prevent all exploitation vectors. The ATT&CK framework categorizes this vulnerability under T1203, which covers exploitation of software vulnerabilities for privilege escalation and code execution. Security teams should also implement monitoring for unusual memory access patterns or application crashes during video processing operations as potential indicators of exploitation attempts.