CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel's flow classifier allows userspace to exploit missing packet header fields, potentially revealing sensitive kernel pointer information through class statistics. This could lead to unauthorized access to kernel memory, impacting the confidentiality and integrity of the system. Organizations using affected Linux kernel versions should prioritize this issue to mitigate risks associated with data exposure and potential privilege escalation.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: Dont expose folded kernel pointers The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct(). Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)