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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp/dccp: Don\u0027t use timer_pending() in reqsk_queue_unlink().\n\nMartin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().\n\n  \"\"\"\n  We are seeing a use-after-free from a bpf prog attached to\n  trace_tcp_retransmit_synack. The program passes the req-\u003esk to the\n  bpf_sk_storage_get_tracing kernel helper which does check for null\n  before using it.\n  \"\"\"\n\nThe commit 83fccfc3940c (\"inet: fix potential deadlock in\nreqsk_queue_unlink()\") added timer_pending() in reqsk_queue_unlink() not\nto call del_timer_sync() from reqsk_timer_handler(), but it introduced a\nsmall race window.\n\nBefore the timer is called, expire_timers() calls detach_timer(timer, true)\nto clear timer-\u003eentry.pprev and marks it as not pending.\n\nIf reqsk_queue_unlink() checks timer_pending() just after expire_timers()\ncalls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will\ncontinue running and send multiple SYN+ACKs until it expires.\n\nThe reported UAF could happen if req-\u003esk is close()d earlier than the timer\nexpiration, which is 63s by default.\n\nThe scenario would be\n\n  1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),\n     but del_timer_sync() is missed\n\n  2. reqsk timer is executed and scheduled again\n\n  3. req-\u003esk is accept()ed and reqsk_put() decrements rsk_refcnt, but\n     reqsk timer still has another one, and inet_csk_accept() does not\n     clear req-\u003esk for non-TFO sockets\n\n  4. sk is close()d\n\n  5. reqsk timer is executed again, and BPF touches req-\u003esk\n\nLet\u0027s not use timer_pending() by passing the caller context to\n__inet_csk_reqsk_queue_drop().\n\nNote that reqsk timer is pinned, so the issue does not happen in most\nuse cases. [1]\n\n[0]\nBUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0\n\nUse-after-free read at 0x00000000a891fb3a (in kfence-#1):\nbpf_sk_storage_get_tracing+0x2e/0x1b0\nbpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda\nbpf_trace_run2+0x4c/0xc0\ntcp_rtx_synack+0xf9/0x100\nreqsk_timer_handler+0xda/0x3d0\nrun_timer_softirq+0x292/0x8a0\nirq_exit_rcu+0xf5/0x320\nsysvec_apic_timer_interrupt+0x6d/0x80\nasm_sysvec_apic_timer_interrupt+0x16/0x20\nintel_idle_irq+0x5a/0xa0\ncpuidle_enter_state+0x94/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb\n\nkfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6\n\nallocated by task 0 on cpu 9 at 260507.901592s:\nsk_prot_alloc+0x35/0x140\nsk_clone_lock+0x1f/0x3f0\ninet_csk_clone_lock+0x15/0x160\ntcp_create_openreq_child+0x1f/0x410\ntcp_v6_syn_recv_sock+0x1da/0x700\ntcp_check_req+0x1fb/0x510\ntcp_v6_rcv+0x98b/0x1420\nipv6_list_rcv+0x2258/0x26e0\nnapi_complete_done+0x5b1/0x2990\nmlx5e_napi_poll+0x2ae/0x8d0\nnet_rx_action+0x13e/0x590\nirq_exit_rcu+0xf5/0x320\ncommon_interrupt+0x80/0x90\nasm_common_interrupt+0x22/0x40\ncpuidle_enter_state+0xfb/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb\n\nfreed by task 0 on cpu 9 at 260507.927527s:\nrcu_core_si+0x4ff/0xf10\nirq_exit_rcu+0xf5/0x320\nsysvec_apic_timer_interrupt+0x6d/0x80\nasm_sysvec_apic_timer_interrupt+0x16/0x20\ncpuidle_enter_state+0xfb/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb"
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              "value": "AV:N - The vulnerability lives in the TCP/DCCP connection-request path and is driven entirely by packets from a remote peer \u2014 a SYN arms the pinned reqsk timer, and a final ACK, RST, or crafted ICMP/ICMPv6 error races `inet_csk_reqsk_queue_drop()` against it. Any internet-facing listening TCP socket is reachable with no local access.\nAC:L - The attacker controls both sides of the race: it chooses when the timer is armed (SYN \u2192 `jiffies + TCP_TIMEOUT_INIT`, 1 s) and when the drop executes (ACK/RST/ICMP at t\u22481 s), and can run thousands of connections in parallel to hit the window reliably. The `TIMER_PINNED` same-CPU argument is defeated by attacker-chosen droppers that run on a different CPU \u2014 ICMP errors via `tcp_req_err()`, plus `tcp_abort()` and `inet_twsk_purge()` in process/workqueue context.\nPR:N - The entire path is pre-authentication TCP three-way-handshake and ICMP error handling in the kernel network stack, executed before any application-level credential check. An unauthenticated remote host merely needs to connect to a listening port.\nUI:N - No victim action is required; the server\u0027s ordinary `accept()`/`close()` lifecycle completes the scenario, and the ICMP and RST droppers need no local activity at all.\nS:U - The corruption is confined to kernel memory within the same security authority \u2014 freed socket objects and listener accept-queue accounting. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed 2376-byte `struct tcp_sock` (KFENCE-confirmed); `bpf_sk_storage_get()` reads `sk-\u003esk_state` and follows the stale `sk-\u003esk_bpf_storage` pointer, returning `sdata-\u003edata` to the caller. An attacker who grooms the reallocated slab object turns that into an arbitrary kernel read primitive.\nI:H - The same UAF yields a write primitive \u2014 with `BPF_SK_STORAGE_GET_F_CREATE` the helper performs `refcount_inc_not_zero(\u0026sk-\u003esk_refcnt)` and `bpf_local_storage_update()` against the freed/reallocated object, and per CVSS kernel guidance a use-after-free is treated as exploitable for control-flow hijacking. Independently, the double `atomic_dec(\u0026queue-\u003eyoung)` persistently corrupts the listener\u0027s SYN-queue accounting.\nA:H - Dereferencing the freed socket oopses or panics the kernel, and the condition is remotely repeatable across many connections. Even without a crash, each hijacked request floods SYN+ACK retransmissions for ~63 s and the underflowed `young` counter permanently clamps `max_syn_ack_retries` to 2, degrading the listener for its remaining lifetime."
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50264",
    "datePublished": "2024-11-19T01:29:59.511Z",
    "dateReserved": "2024-10-21T19:36:19.982Z",
    "dateUpdated": "2026-08-05T11:42:54.020Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}