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A Time-of-check time-of-use (TOCTOU) race condition in the SMM communications buffer could allow a privileged attacker to bypass input validation and perform an out of bounds read or write, potentially resulting in loss of confidentiality, integrity, or availability.

CVE-2024-36311 identifies a Time-of-check Time-of-use (TOCTOU) race condition vulnerability classified under CWE-367 in the System Management Mode (SMM) communications buffer of AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics. The SMM is a highly privileged execution mode used for low-level system management and security functions. This vulnerability arises because the input validation performed during the check phase can be bypassed by a race condition before the use phase, allowing an attacker with privileged local access to perform out-of-bounds memory reads or writes. Such unauthorized memory access can lead to breaches in confidentiality by exposing sensitive data, compromise integrity by altering critical data structures, or affect availability by causing system instability or crashes. The CVSS 4.0 vector indicates that exploitation requires local access with low complexity and no user interaction, but privileges are necessary. No known exploits have been reported in the wild, and no patches are currently linked, indicating that mitigation relies on forthcoming firmware updates from AMD. The vulnerability does not affect the system’s secure configuration or require social engineering, but the scope is limited to systems using the affected AMD Ryzen 7045 mobile processors. This class of vulnerability is particularly concerning because SMM operates at a higher privilege level than the operating system, making exploitation potentially impactful if achieved. Organizations using affected processors in mobile devices should monitor for firmware updates and restrict privileged access to mitigate risks.

Detailed information about CVE-2024-36311: CWE-367  Time-of-check Time-of-use (TOCTOU) Race Condition in AMD AMD Ryzen™ 7045 Series Mobile Processors with Radeo

CVE-2024-36311: CWE-367  Time-of-check Time-of-use (TOCTOU) Race Condition in AMD AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2024-36311: CWE-367  Time-of-check Time-of-use (TOCTOU) Race Condition in AMD AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphics

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