{"id":"CVE-2022-48851","state":"PUBLISHED","title":"staging: gdm724x: fix use after free in gdm_lte_rx()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: gdm724x: fix use after free in gdm_lte_rx()\n\nThe netif_rx_ni() function frees the skb so we can't dereference it to\nsave the skb->len.","publishedAt":"2024-07-16T12:25:18.488Z","updatedAt":"2026-08-05T08:52:38.698Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux 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- gdm_lte_rx() is the RX completion path of the GDM724x LTE WWAN netdev; a remote peer that can deliver packets over the cellular/IP path causes the modem to submit LTE_RX_SDU bulk data, which flows USB RX → do_rx() → gdm_lte_receive_pkt() → gdm_lte_netif_rx() → gdm_lte_rx() on every received SDU—ordinary network traffic, not USB-descriptor framing.\nAC:L - Every successful receive that returns NET_RX_SUCCESS from netif_rx_ni() takes the else branch and dereferences skb->len after the skb has been consumed/freed by backlog softirq processing; the attacker only needs to deliver packets and needs no race or uncontrollable victim state.\nPR:N - Inbound LTE SDUs are processed with no host authentication, credentials, or capabilities; a remote network peer needs no OS account on the target.\nUI:N - Once the modem is attached and the lte*pdn* interfaces are up (typical always-on LTE/IoT deployment), packet delivery alone triggers the path with no mount, file-open, or other victim 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