CVE-2023-31083 : Security Advisory and Response
Discover the impact of CVE-2023-31083, a vulnerability in Linux kernel 6.2 that can lead to a NULL pointer dereference due to a race condition. Learn about affected systems, exploitation, and mitigation.
An issue in drivers/bluetooth/hci_ldisc.c in the Linux kernel 6.2 can lead to a NULL pointer dereference due to a race condition between HCIUARTSETPROTO and HCIUARTGETPROTO.
Understanding CVE-2023-31083
This CVE identifies a vulnerability in the Linux kernel 6.2 that can result in a NULL pointer dereference due to a race condition.
What is CVE-2023-31083?
The vulnerability lies in hci_uart_tty_ioctl, specifically in the race condition between HCIUARTSETPROTO and HCIUARTGETPROTO. This leads to HCI_UART_PROTO_SET being set before hu->proto, potentially causing a NULL pointer dereference.
The Impact of CVE-2023-31083
Exploitation of this vulnerability can result in a NULL pointer dereference, which could potentially lead to a denial of service (DoS) condition or other impacts on affected systems.
Technical Details of CVE-2023-31083
This section provides more detailed technical information about the vulnerability.
Vulnerability Description
The issue arises in the Linux kernel 6.2 in hci_uart_tty_ioctl, where a race condition can cause HCI_UART_PROTO_SET to be set before hu->proto, leading to a NULL pointer dereference.
Affected Systems and Versions
The vulnerability affects Linux kernel 6.2.
Exploitation Mechanism
Exploiting this vulnerability requires knowledge of the specific race condition between HCIUARTSETPROTO and HCIUARTGETPROTO.
Mitigation and Prevention
To secure systems against CVE-2023-31083, certain steps can be taken.
Immediate Steps to Take
Ensure that systems running Linux kernel 6.2 are updated with the latest patches and security fixes. Monitor for any unusual activity that may indicate exploitation of the vulnerability.
Long-Term Security Practices
Implement a robust security posture that includes regular security updates, threat monitoring, and maintaining awareness of kernel vulnerabilities.
Patching and Updates
Stay informed about patches released by the Linux kernel maintainers and apply them promptly to address any known vulnerabilities.