Description

In vdec, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11262030; Issue ID: MSV-9196.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.4",
  "pubDate": "2026-09-07T02:17:18.917Z",
  "pubdate": "2026-09-07T02:17:18.917Z",
  "executiveSummary": "This vulnerability involves an out-of-bounds (OOB) write condition within the vdec component, stemming from an inadequate validation of input boundaries.\nThe flaw allows an attacker to perform memory corruption, potentially leading to local escalation of privilege (EoP).\nThe vulnerability is critical as it requires no additional execution privileges and does not necessitate user interaction, facilitating a 'zero-click' local attack vector.\nSuccessful exploitation could allow an unauthorized local entity to execute arbitrary code with elevated permissions, thereby compromising system integrity and security boundaries.\nThe issue is tracked under Issue ID: MSV-9196 and corresponds to the vendor-provided Patch ID: ALPS11262030.",
  "technicalDetails": "The root cause of this vulnerability is a missing bounds check within the vdec (Video Decoder) module during the processing of data buffers.\nWhen the vdec driver processes incoming video data, it fails to verify that the length of the input data corresponds correctly to the destination buffer size allocated in kernel memory.\nAn attacker can craft a malicious payload that triggers this discrepancy, resulting in a write operation that extends beyond the boundaries of the designated destination buffer.\nBecause the vdec component operates with kernel-level privileges, an OOB write effectively allows the overwriting of adjacent memory structures or critical kernel data, such as function pointers or object headers.\nThe attack flow proceeds as follows: First, the attacker identifies an interface or IOCTL (Input/Output Control) path that interacts with the vulnerable vdec driver. Second, the attacker submits a specifically crafted input package containing a length field that exceeds the internal buffer constraints. Third, the driver fails to perform the necessary sanity checks on the length field, causing the memory management subsystem to write data to unauthorized memory locations. Finally, the attacker achieves arbitrary code execution by redirecting control flow via overwritten pointers or escalating current process privileges through the modification of process security tokens.\nThe vulnerability is particularly dangerous because it does not require user interaction, meaning a malicious application running on the system can trigger the exploit autonomously.\nThe lack of memory safety checks in the vdec module ensures that the buffer overflow is deterministic, allowing for reliable exploit payloads.\nPost-exploitation, the attacker maintains full control over the execution flow within the kernel context, leading to permanent privilege escalation until the system is rebooted or patched."
}