CVSS
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Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: net: always dissect GSO packets in __virtio_net_hdr_to_skb() Commit 9e8db5913264 ("net: avoid false positives in untrusted gso validation") added a '&& skb->network_header' check before flow-dissecting GSO packets without VIRTIO_NET_HDR_F_NEEDS_CSUM in __virtio_net_hdr_to_skb(), because some callers (such as tun_get_user(), tun_xdp_one(), virtnet_receive_done(), and raw_verify_header()) called virtio_net_hdr_*_to_skb() before initializing skb->network_header and skb->dev. Because __alloc_skb() and __build_skb_around() zero-initialize skb->network_header to 0 (unlike mac_header and transport_header which are initialized to ~0U), those four callers always had skb->network_header == 0 and bypassed flow dissection in __virtio_net_hdr_to_skb(). More generally, skb->network_header is an offset from skb->head (where 0 is also a valid offset whenever skb_headroom(skb) is 0), not a boolean flag. Whenever the 'if (gso_type && skb->network_header)' branch was skipped, the fallback 'else if (gso_type)' only pulled nh_min_len + thlen (40 bytes for TCPv4) without dissecting the packet, without validating ip_proto or n_proto, and without setting skb->transport_header. If the packet has a malformed network header, it is not rejected and a subsequent skb_probe_transport_header() also fails, leaving skb->transport_header at ~0U (0xffff). Similarly, if an IPv4 packet carries IP options (ihl > 5) or an IPv6 packet carries extension headers, pulling only nh_min_len + thlen can leave the TCP header outside skb->head. In both cases, tcp_hdrlen(skb) in skb_gso_transport_seglen() reads out-of-bounds: BUG: KASAN: slab-out-of-bounds in skb_gso_transport_seglen Read of size 2 by task poc/133 skb_gso_transport_seglen (net/core/gso.c:155) skb_gso_validate_mac_len (net/core/gso.c:270) tbf_enqueue (net/sched/sch_tbf.c:260) dev_qdisc_enqueue (net/core/dev.c:4227) __dev_queue_xmit (net/core/dev.c:4884) In additi
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- Linux Linux: d5be7f632bad0f489879eed0ff4b99bd7fe0b74c преди 5f4dfdf0077730e9d3ef5b37ceb17a5a56d6f34c; d5be7f632bad0f489879eed0ff4b99bd7fe0b74c преди 44378d02c5aaae24b60a75fbbb539b4aa4db503d; dac7d4432b13d6b58923c1178b786bcda37c9e9e; e93384b12443c9bb6830b56b7d299beed432b865; f709f7b28d76de327373598a0fda9f916c36b5e6; d996573ebd5c528c613e90b7e7daa961d58fa16e; c375152be9dd9d6fbf6ae5ac8be337d0590f192a; 0dab7eb86ea06ce8c530785f1999948c6f223c96; ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d; 54ef8243c3c8e90f1ea5792e6752e021a25c8eb3; 4.14.104 преди 4.15; 4.19.26 преди 4.20; 4.20.13 преди 4.21; 4.14.226 преди 4.15; 4.19.181 преди 4.20
- Linux Linux: 5.0; преди 5.0; 7.2.11 до 7.2.*; от 7.3 нататък
История
- 23 октомври 2026 Публикувано