CVE-2023-52918 in Linux
Summary
by MITRE • 10/22/2024
In the Linux kernel, the following vulnerability has been resolved:
media: pci: cx23885: check cx23885_vdev_init() return
cx23885_vdev_init() can return a NULL pointer, but that pointer is used in the next line without a check.
Add a NULL pointer check and go to the error unwind if it is NULL.
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Analysis
by VulDB Data Team • 01/19/2026
The vulnerability identified as CVE-2023-52918 resides within the Linux kernel's media subsystem, specifically affecting the pci cx23885 driver component. This issue manifests in the cx23885_vdev_init() function which is responsible for initializing video device structures within the kernel's media framework. The flaw represents a classic null pointer dereference vulnerability that occurs during device initialization processes. The cx23885 driver handles various PCI-based media devices including video capture and broadcast TV tuner cards, making this vulnerability particularly significant for systems utilizing such hardware components. The vulnerability is categorized under CWE-476 which specifically addresses NULL pointer dereference conditions that can lead to system crashes or potential privilege escalation scenarios.
The technical implementation flaw occurs when the cx23885_vdev_init() function returns a NULL pointer to indicate initialization failure, yet the calling code proceeds to use this potentially null return value without proper validation. This pattern violates fundamental defensive programming practices and creates an execution path where subsequent operations attempt to dereference a null pointer, leading to immediate system termination through kernel oops or panic conditions. The driver's initialization sequence fails to implement proper error handling mechanisms, specifically lacking the conditional check that would prevent proceeding with uninitialized device structures. This error handling deficiency directly contravenes best practices outlined in the kernel's coding standards and security guidelines.
The operational impact of this vulnerability extends beyond simple system crashes, as it can be exploited in denial of service scenarios against systems running affected kernel versions. When exploited, the null pointer dereference causes immediate kernel panics, resulting in system instability and potential data loss. Systems utilizing cx23885 compatible hardware such as certain television tuner cards, video capture devices, and multimedia processing systems become vulnerable to these attacks. The vulnerability affects kernel versions where the fix has not been applied, typically those released prior to the patch implementation. The attack surface is particularly relevant for servers, embedded systems, and multimedia workstations that rely on PCI-based media device support, as these systems may be targeted through malicious device initialization sequences or exploitation of legitimate device drivers.
Mitigation strategies for CVE-2023-52918 primarily involve applying the official kernel patches that implement the required NULL pointer checks in the cx23885 driver code. System administrators should prioritize updating to kernel versions that include the fix, typically kernel versions 6.3 and later where the patch has been integrated. The recommended approach involves implementing a proper error handling flow that checks the return value of cx23885_vdev_init() before proceeding with subsequent operations. This aligns with the ATT&CK framework's defensive techniques related to kernel-level exploit mitigation and system hardening. Organizations should also consider monitoring for unusual system behavior or kernel panic logs that might indicate exploitation attempts, as the vulnerability manifests through predictable kernel oops conditions. Additionally, maintaining current kernel versions and implementing regular security updates remains essential for protecting against similar vulnerabilities in the media subsystem and related PCI device drivers.