Karl.Fail

Tag: out-of-bounds read

  • Critical Vulnerability in Samsung Mobile Processor and Modem – CVE-2025-27891

    Overview of CVE-2025-27891

    A critical vulnerability has been discovered in several Samsung Mobile Processors, Wearable Processors, and Modems, including the Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, W920, W930, W1000, Modem 5123, Modem 5300, and Modem 5400. This issue, tracked as CVE-2025-27891, is caused by the lack of a length check, leading to out-of-bounds reads when malformed NAS packets are received.

    Details of the Vulnerability

    The vulnerability occurs because these processors fail to check the length of incoming NAS (Non-Access Stratum) packets, which are used in mobile communication. If the packets are malformed, it can result in out-of-bounds memory reads, potentially leading to information disclosure or other unintended behavior in the affected devices. This could allow attackers to exploit the vulnerability remotely without requiring user interaction.

    This issue is particularly critical for devices relying on these Samsung processors, including smartphones, wearables, and modem units, as it poses a risk to the confidentiality of the system and can potentially impact system availability.

    CVSS Score and Impact

    The CVSS v3.1 score for CVE-2025-27891 is 9.1, indicating a critical vulnerability. The CVSS vector string for this vulnerability is: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H, which indicates the following:

    • Attack Vector (AV): Network – The vulnerability can be exploited remotely.
    • Attack Complexity (AC): Low – The vulnerability does not require complex conditions to exploit.
    • Privileges Required (PR): None – No special privileges are required to exploit the vulnerability.
    • User Interaction (UI): None – The vulnerability can be exploited without user interaction.
    • Confidentiality Impact (C): High – An attacker could gain access to sensitive data.
    • Integrity Impact (I): None – The integrity of the system data is not affected.
    • Availability Impact (A): High – The vulnerability could cause system instability or downtime.

    Mitigation

    Samsung has acknowledged the issue and is working on providing updates to address the vulnerability. Users of affected devices should monitor the official Samsung Semiconductor security updates page for patches and further guidance. To mitigate the risk, it is recommended that users update their devices as soon as patches are made available.

    For further information, visit Samsung’s official security update pages: Samsung Security Updates and CVE-2025-27891 Details.

    Conclusion

    The CVE-2025-27891 vulnerability highlights the importance of proper validation checks within mobile processors and modems. Samsung users are urged to apply updates promptly to prevent potential exploitation of this critical flaw.