CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's Open vSwitch (OVS) component, specifically related to the handling of Generic Segmentation Offload (GSO) packets. An attacker can exploit this flaw to cause a truncation underflow, potentially leading to memory corruption or denial of service when userspace actions process GSO packets. Organizations using Linux with Open vSwitch should prioritize this fix to mitigate risks associated with packet processing vulnerabilities.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix GSO userspace truncation underflow OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb length in OVS_CB(skb)->cutlen. When a later userspace action segments a GSO skb, queue_gso_packets() reuses that delta for each smaller segment. A segment can then reach queue_userspace_packet() with cutlen greater than skb->len, underflowing the length passed to skb_zerocopy(). Store the maximum preserved length instead and bound each consumer against the current skb length. Use U32_MAX as the no-truncation sentinel so the value remains valid if skb geometry changes before a consumer handles it.