CVE-2024-36883

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to an out-of-bounds access in the net alloc generic() function in the Linux kernel. This function is called by net alloc() without any locking, and it reads max gen ptrs, which is changed under pernet ops rwsem. The function reads max gen ptrs twice, first to allocate an array and then to set s.len, which is later used to limit the bounds of the array access. It is possible that the array is allocated and another thread is registering a new pernet ops, increments max gen ptrs, which is then used to set s.len with a larger than allocated length for the variable array. This could allow an attacker to impact the confidentiality, integrity, and availability of protected information.

Recommendations To resolve the issue, read max gen ptrs only once in net alloc generic(). If max gen ptrs is later incremented, it will be caught in net assign generic(). As a temporary workaround, consider restricting access to the vulnerable net alloc generic() function until a patch is available.