Description

In venc, there is a possible out of bounds write due to type confusion. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11383899; Issue ID: MSV-9606.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.7",
  "pubDate": "2026-10-05T02:16:54.150Z",
  "pubdate": "2026-10-05T02:16:54.150Z",
  "executiveSummary": "An out-of-bounds write vulnerability has been identified within the venc component, designated under Issue ID MSV-9606. This vulnerability stems from a type confusion security flaw, where the system misinterprets the data type of an allocated memory block or object during processing. Exploitation of this vulnerability allows a local malicious actor to achieve local escalation of privilege. However, successful exploitation carries a prerequisite that the attacker must have already compromised the system and obtained System-level privileges. No user interaction is required to trigger or exploit this vulnerability, making automated escalation highly feasible once the initial foothold is established. The risk implications are severe for environments where system-privileged processes must be strictly isolated from kernel or higher-privileged execution domains. Administrators and security teams are advised to apply the associated patch, identified as Patch ID ALPS11383899, to remediate this weakness. Failing to patch this vulnerability leaves systems vulnerable to post-exploitation privilege persistence and deeper system compromise by highly privileged local adversaries. By leveraging this vulnerability, an attacker can bypass traditional security boundaries within the operating system, potentially compromising kernel space or hypervisor layers depending on the execution context of the venc component.",
  "technicalDetails": "The core vulnerability lies within the venc component, which is susceptible to a type confusion condition. In software security, type confusion occurs when a piece of memory is allocated with one specific structure or data type but is subsequently accessed or written to as if it were a different, incompatible data type. This discrepancy in type definition leads to a mismatch in size, alignment, and member offsets between the expected data structure and the actual memory allocated.\nType confusion often occurs in drivers or media processing components like venc when handling complex serialized data, polymorphism, or dynamic object casting without sufficient runtime type verification. When venc casts a base object pointer to a derived object pointer incorrectly, the application assumes a larger memory layout than what was actually allocated. Writing to fields exclusive to the derived class triggers the out-of-bounds write. When the venc component processes input under this type-confused state, it performs write operations that exceed the boundary of the allocated memory buffer. This leads to an out-of-bounds (OOB) write. Because the writing mechanism does not properly validate the boundaries of the misaligned structure, an attacker can selectively overwrite adjacent memory blocks.\nTo execute this attack, the adversary must follow a specific sequence of operations. First, the malicious actor must establish a local presence on the target system and successfully escalate their privileges to the System level. Second, the attacker leverages their System privileges to interface directly with the vulnerable venc component. Because no user interaction is required, this step can be executed silently via automated scripts or local exploit payloads. Third, the attacker sends crafted inputs or triggers specific APIs within venc that induce the type confusion state. Fourth, the resulting out-of-bounds write allows the attacker to corrupt critical kernel data structures, function pointers, or execution flow control registers. Finally, this memory corruption is leveraged to execute arbitrary code or alter system states, achieving a local escalation of privilege beyond the initial System privilege level, such as kernel-mode execution or hypervisor control.\nThe impact of an out-of-bounds write in a privileged component like venc is critical. Memory corruption of this nature can bypass modern exploit mitigation techniques such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP) if the attacker can control the address and the data being written. The requirement of pre-existing System privileges indicates that the vulnerability likely resides in a highly privileged user-mode service, a system daemon, or a kernel-space driver. Consequently, exploiting venc allows the transition from a highly privileged user-space context (System) to a kernel-level or supervisor-level context, completely undermining the operating system's security architecture. This issue is tracked under Issue ID MSV-9606, and the remediation for this security vulnerability is addressed in Patch ID ALPS11383899."
}