CVE-2024-42265

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.6.50

Description The issue is related to the Linux kernel, specifically with the do dup2() function, where a misprediction might lead to speculative execution of tofree = fdt->fd[fd]. This is wrong for the same reasons it is wrong in close fd()/file close fd locked(). The solution involves using array index nospec(fd, fdt->max fds) to protect against mispredictions. The vulnerability is associated with incorrect input validation in the fs/file component of the Linux kernel, which could allow an attacker to cause a denial of service.

Recommendations For Linux kernel versions prior to 6.6.50, update to version 6.6.50 or later to resolve the issue. As a temporary workaround, consider restricting access to the vulnerable do dup2() function until a patch is available. Avoid using the fd variable in the affected do dup2() function until the issue is resolved.