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CVE-2026-80590: Linux

8.6

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: inet: frags: strip GSO state from fragments before reassembly A virtio_net_hdr (tun/tap, or AF_PACKET with PACKET_VNET_HDR) can mark an IPv4 or IPv6 fragment as GSO; nothing relates gso_type to frag_off. inet_frag_reasm_prepare()/inet_frag_reasm_finish() keep the first fragment's skb as the head of the reassembled datagram, including its shinfo->gso_size/gso_type/gso_segs, and chain the remaining fragments on frag_list with whatever linear/paged layout they arrived with. After ip_defrag() (ip_local_deliver(), nf_defrag_ipv4, ...) the reassembled skb therefore still claims to be GSO (SKB_GSO_DODGY), and the next software segmentation point - udp_rcv_segment() on local delivery, validate_xmit_skb(), or the ip_finish_output_gso() slow path - hands it to skb_segment(). skb_segment()'s frag_list walk assumes GRO-shaped input and hits one of its BUG_ON()s. Two writes to a tap by an unprivileged user in its own userns are enough: kernel BUG at net/core/skbuff.c:4899! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 1000 PID: 82 Comm: poc Not tainted 7.2.0-pentest+ #2 RIP: 0010:skb_segment+0x20ca/0x48b0 Call Trace: <TASK> __udp_gso_segment+0x29a/0x27d0 udp4_ufo_fragment+0x458/0x6c0 inet_gso_segment+0x429/0x1340 skb_mac_gso_segment+0x233/0x4f0 __skb_gso_segment+0x308/0x660 udp_queue_rcv_skb+0x440/0xad0 udp_unicast_rcv_skb+0xc7/0x2c0 udp_rcv+0x16ce/0x2260 ip_protocol_deliver_rcu+0x197/0x2d0 ip_local_deliver+0x430/0x690 ip_rcv+0x16f/0x1f0 __netif_receive_skb_one_core+0x15e/0x1c0 __netif_receive_skb+0x1e/0x110 netif_receive_skb+0xf6/0x5c0 tun_rx_batched.isra.0+0x3ab/0x790 tun_get_user+0x17c3/0x3550 tun_chr_write_iter+0xba/0x1b0 vfs_write+0x646/0x1130 </TASK> Kernel panic - not syncing: Fatal exception in interrupt This runs with BH disabled, so it is a panic rather than an oops. The same is reachable with CAP_NET_RAW in a ne

Засегнати продукти

  • Linux Linux: f43798c27684ab925adde7d8acc34c78c6e50df8 преди cfdbc8c2e6f9ef5d8b8e54859da03dfe682b0bee; f43798c27684ab925adde7d8acc34c78c6e50df8 преди 29dda278a5ed272f2230ff4eaa23cf403107bba0; f43798c27684ab925adde7d8acc34c78c6e50df8 преди 14a8f3e10fa9a5abd6cedcdaa0c0b7ea9a09f234; f43798c27684ab925adde7d8acc34c78c6e50df8 преди 3edf721bb4b99d272c336631b44e3d8ff9a4f31b; f43798c27684ab925adde7d8acc34c78c6e50df8 преди dec2edb7aaf12a8878b3a03172ea8fc277b8eaad; f43798c27684ab925adde7d8acc34c78c6e50df8 преди c49f04e8d2b94dbb8d9fd99731dd3f00589c8ace; f43798c27684ab925adde7d8acc34c78c6e50df8 преди 69b73b74d9eb45f5560a8fe4fa406ada580e1340; f43798c27684ab925adde7d8acc34c78c6e50df8 преди da857e448322a2e871ce3ecc2900027041160d43; f43798c27684ab925adde7d8acc34c78c6e50df8 преди d5dc1e69fd7258ea605c9952e5d5947539159ae3
  • Linux Linux: 2.6.27; преди 2.6.27; 5.10.268 до 5.10.*; 5.15.219 до 5.15.*; 6.1.186 до 6.1.*; 6.6.155 до 6.6.*; 6.12.107 до 6.12.*; 6.18.48 до 6.18.*; 7.1.12 до 7.1.*; 7.2.2 до 7.2.*; от 7.3 нататък

История

  • 28 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-80590: Linux | freedomonline.bg