CVE-2026-58990 in Android
Summary
by MITRE • 11/02/2026
In l2c_fcr_process_peer_cfg_req of l2c_fcr.cc, there is a possible memory safety issue due to an integer overflow. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in the l2c_fcr_process_peer_cfg_req function within the l2c_fcc.cc source file represents a critical memory safety flaw rooted in integer arithmetic errors. Specifically, an integer overflow occurs during the processing of peer configuration requests, which compromises the integrity of buffer size calculations or loop bounds used for data handling operations. This type of vulnerability typically arises when signed integers are used to represent sizes that can exceed their maximum positive value, causing them to wrap around into negative numbers or unexpectedly small positive values. In the context of network protocol processing, such as Layer 2 Control (L2C) Frame Relay Configuration Request handling, this miscalculation leads to incorrect memory allocation or access patterns where the system fails to validate that input data fits within expected boundaries before copying it into internal buffers.
From a technical perspective, this flaw aligns with Common Weakness Enumeration category CWE-190, which describes integer overflow or wraparound errors. When an attacker crafts a maliciously sized configuration request packet, they can trigger the arithmetic underflow or overflow condition. This results in the application allocating insufficient memory for the incoming data buffer while simultaneously attempting to write more data than allocated based on the original, unvalidated input size. Consequently, this leads to a heap-based buffer overread or out-of-bounds read operation rather than an overwrite, depending on how the specific implementation handles the subsequent copy operations and bounds checking mechanisms that may have been bypassed due to the corrupted length values.
The operational impact of this vulnerability is severe because it enables remote information disclosure without requiring any prior authentication or user interaction. An attacker positioned anywhere along the network path can send specially crafted packets directly to the affected service, exploiting the integer overflow to read sensitive memory contents from the process space. This could include cryptographic keys, session tokens, internal system configurations, or other proprietary data structures residing in adjacent heap regions. Since no additional execution privileges are needed, this vulnerability significantly lowers the barrier for exploitation, allowing unauthenticated adversaries to gain unauthorized access to confidential information simply by interacting with the network service endpoint.
This attack vector is consistent with techniques documented in the MITRE ATT&CK framework under T1074, specifically Data Staged or Exfiltration Over C2 Channels if used in conjunction with other tools, but more directly relates to initial reconnaissance and data collection phases where sensitive information is gathered from memory dumps or buffer overreads. The lack of user interaction requirement classifies this as a high-severity remote code execution precursor or direct information disclosure vulnerability, often rated Critical by CVSS standards due to its low complexity and broad attack surface across networked devices running the affected software component.
Mitigation strategies must focus on rigorous input validation and safe arithmetic practices within the source code. Developers should implement explicit checks for integer overflow before performing any memory allocation or copy operations involving user-supplied lengths. Utilizing unsigned integers with proper boundary checking, employing compiler flags that enable stack smashing protection and address sanitizer during development, and integrating static analysis tools capable of detecting CWE-190 patterns are essential steps. Furthermore, deploying network intrusion detection systems to monitor for anomalous packet sizes in L2C configuration requests can provide a temporary layer of defense while the underlying code is patched with validated length checks that ensure input data does not exceed allocated buffer limits.