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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()\n\nThere is a potential NULL pointer dereference in zd_mac_tx_to_dev(). For\nexample, the following is possible:\n\n    \tT0\t\t\t    \t\tT1\nzd_mac_tx_to_dev()\n  /* len == skb_queue_len(q) */\n  while (len \u003e ZD_MAC_MAX_ACK_WAITERS) {\n\n\t\t\t\t\t  filter_ack()\n\t\t\t\t\t    spin_lock_irqsave(\u0026q-\u003elock, flags);\n\t\t\t\t\t    /* position == skb_queue_len(q) */\n\t\t\t\t\t    for (i=1; i\u003cposition; i++)\n\t\t\t\t    \t      skb = __skb_dequeue(q)\n\n\t\t\t\t\t    if (mac-\u003etype == NL80211_IFTYPE_AP)\n\t\t\t\t\t      skb = __skb_dequeue(q);\n\t\t\t\t\t    spin_unlock_irqrestore(\u0026q-\u003elock, flags);\n\n    skb_dequeue() -\u003e NULL\n\nSince there is a small gap between checking skb queue length and skb being\nunconditionally dequeued in zd_mac_tx_to_dev(), skb_dequeue() can return NULL.\nThen the pointer is passed to zd_mac_tx_status() where it is dereferenced.\n\nIn order to avoid potential NULL pointer dereference due to situations like\nabove, check if skb is not NULL before passing it to zd_mac_tx_status().\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
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          "url": "https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0"
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          "url": "https://git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047"
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          "url": "https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc"
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        },
        {
          "url": "https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023"
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      ],
      "title": "wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()",
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    "dateReserved": "2025-04-16T04:51:24.023Z",
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              "value": "AV:N - The oops is driven entirely by a received UDP/rxrpc datagram processed in the endpoint\u0027s I/O thread (`rxrpc_encap_rcv` \u2192 `rxrpc_input_packet` \u2192 `rxrpc_new_incoming_call`), and AF_RXRPC services live on routable UDP ports such as the well-known AFS callback port 7001. Any remote host able to send a packet to that port reaches the vulnerable function.\nAC:L - A single well-formed rxrpc DATA packet (seq!=0, callNumber!=0, matching serviceId, securityIndex 0) deterministically dereferences the NULL backlog pointer \u2014 no race, memory-layout, or timing dependency in the packet path itself, and the well-known service IDs are protocol constants. The attacker can simply keep the port fed so any bind\u2192listen window (as in `afs_open_socket`) is hit, and sockets bound without listening are persistently exposed.\nPR:N - The attacker is an unauthenticated remote peer holding no credentials on the victim: `rxrpc_get_incoming_security()` accepts `RXRPC_SECURITY_NONE` with no key at all, and even for secured services the CHALLENGE is only queued after `rxrpc_alloc_incoming_call()` has already crashed. The same crash is also reachable by a plain unprivileged local user, since `rxrpc_create()`/`rxrpc_bind()` require no capability.\nUI:N - The crash happens autonomously inside the rxrpc I/O kernel thread while processing an inbound packet against an already-bound service socket. No victim action, mount, or file access is part of the attack.\nS:U - The NULL dereference and its consequences are confined to the kernel of the host running the AF_RXRPC service socket, with no crossing into a hypervisor, IOMMU, or sandbox authority.\nC:N - The faulting access is a read of `b-\u003ecall_backlog_head` at offset 4 from NULL, which is below `mmap_min_addr` and faults immediately. No kernel memory contents are returned to the attacker or leaked to userspace.\nI:N - Execution aborts on the very first load in `rxrpc_alloc_incoming_call()`, before any of the subsequent stores (`peer-\u003esrx = *peer_srx`, `conn-\u003elocal = ...`) are reached. Nothing is written or corrupted, so no overwrite or control-flow hijack primitive exists.\nA:H - The dereference oopses the rxrpc I/O kthread while it holds `read_lock_irq(\u0026local-\u003eservices_lock)` and `spin_lock(\u0026rx-\u003eincoming_lock)`, so the thread dies with IRQs disabled and both locks permanently held \u2014 all rxrpc/AFS traffic on that endpoint stops and any later bind or socket release spins forever. Under the common `panic_on_oops=1` configuration it is an immediate full system panic, repeatable with one packet."
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