CyberRota Analysis
AI-GeneratedThe vulnerability affects ipvlan devices in the Linux kernel, which improperly inherit necessary headroom and tailroom parameters from the physical device during initialization. This oversight can lead to packet processing issues, including reallocation overhead, skb headroom underflows, and potential crashes due to slab-use-after-free errors. Organizations utilizing Linux systems with ipvlan configurations, particularly those involving advanced networking features like macsec or ipsec, should prioritize addressing this vulnerability to maintain system stability and security.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: ipvlan: inherit needed_headroom and needed_tailroom from phy_dev ipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(), but leave needed_headroom and needed_tailroom set to 0. When the underlying phy_dev (or stacked lower device) requires extra headroom or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx headroom), upper layers calculating packet headroom and tailroom fail to reserve sufficient space. This can result in reallocation overhead, skb headroom underflows, or KASAN slab-use-after-free crashes when dev_hard_header() / ipvlan_hard_header() prepends header data or when lower devices append tailroom. Fix this by: 1. Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init(). 2. Propagating needed_headroom and needed_tailroom updates to attached ipvlans in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.