CVE-2026-74616Memory corruption in Linux kernel XDP
In the Linux kernel, the following vulnerability has been resolved: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.
View on NVDAnalysis
A critical memory corruption vulnerability has been identified in the Linux kernel's Express Data Path (XDP) implementation. This could potentially allow an attacker to corrupt memory or gain elevated privileges through malicious network traffic in high-performance networking environments.
Relevant roles
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HEPSS
Technical description
In the Linux kernel, the following vulnerability has been resolved: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.
References
- https://git.kernel.org/stable/c/58408982fa39f9758124cec169f42854d6f98f35
- https://git.kernel.org/stable/c/685edea27ac68d08fe4dbd3de74b858d2ad8e830
- https://git.kernel.org/stable/c/ba13763d667e008e185fedf592d53846a5b457d1
- https://git.kernel.org/stable/c/e48e8edbef2eb824201495daa5234560f632b23c
- https://git.kernel.org/stable/c/ef4b7c7046d29a67090de15af0da0d1ae8d1b192
- https://git.kernel.org/stable/c/f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0
- https://git.kernel.org/stable/c/fab820f1691a9e26d9031f18aae1e9ce09078f92