CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the BPF (Berkeley Packet Filter) subsystem, specifically concerning the compatibility checks for program arrays in cgroup local storage. This flaw allows a storage-less program to improperly bridge a tail call chain to a storage-using callee, potentially leading to unauthorized access to sensitive data or execution paths. Organizations utilizing Linux systems with BPF functionality should prioritize addressing this issue to mitigate potential security risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Tighten cgroup storage cookie checks for prog arrays The fix in commit abad3d0bad72 ("bpf: Fix oob access in cgroup local storage") is still incomplete. The prog-array compatibility check treats a program with no cgroup storage as compatible with any stored storage cookie. This allows a storage-less program to bridge a tail call chain between an entry program and a storage-using callee even though cgroup local storage at runtime still follows the caller's context, that is, A -> B(no storage) -> C(storage) path. Requiring exact cookie equality would break the legitimate case of a storage-less leaf program being tail called from a storage-using one. Instead, only accept a zero storage cookie if the program cannot perform tail calls itself. This keeps A -> B(no storage) working while rejecting the A -> B(no storage) -> C(storage) bridge.