{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38246",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38246"
  ],
  "published": "2025-07-09T10:43:51Z",
  "summary": "bnxt: properly flush XDP redirect lists",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt: properly flush XDP redirect lists\n\nWe encountered following crash when testing a XDP_REDIRECT feature\nin production:\n\n[56251.579676] list_add corruption. next->prev should be prev (ffff93120dd40f30), but was ffffb301ef3a6740. (next=ffff93120dd\n40f30).\n[56251.601413] ------------[ cut here ]------------\n[56251.611357] kernel BUG at lib/list_debug.c:29!\n[56251.621082] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n[56251.632073] CPU: 111 UID: 0 PID: 0 Comm: swapper/111 Kdump: loaded Tainted: P           O       6.12.33-cloudflare-2025.6.\n3 #1\n[56251.653155] Tainted: [P]=PROPRIETARY_MODULE, [O]=OOT_MODULE\n[56251.663877] Hardware name: MiTAC GC68B-B8032-G11P6-GPU/S8032GM-HE-CFR, BIOS V7.020.B10-sig 01/22/2025\n[56251.682626] RIP: 0010:__list_add_valid_or_report+0x4b/0xa0\n[56251.693203] Code: 0e 48 c7 c7 68 e7 d9 97 e8 42 16 fe ff 0f 0b 48 8b 52 08 48 39 c2 74 14 48 89 f1 48 c7 c7 90 e7 d9 97 48\n 89 c6 e8 25 16 fe ff <0f> 0b 4c 8b 02 49 39 f0 74 14 48 89 d1 48 c7 c7 e8 e7 d9 97 4c 89\n[56251.725811] RSP: 0018:ffff93120dd40b80 EFLAGS: 00010246\n[56251.736094] RAX: 0000000000000075 RBX: ffffb301e6bba9d8 RCX: 0000000000000000\n[56251.748260] RDX: 0000000000000000 RSI: ffff9149afda0b80 RDI: ffff9149afda0b80\n[56251.760349] RBP: ffff9131e49c8000 R08: 0000000000000000 R09: ffff93120dd40a18\n[56251.772382] R10: ffff9159cf2ce1a8 R11: 0000000000000003 R12: ffff911a80850000\n[56251.784364] R13: ffff93120fbc7000 R14: 0000000000000010 R15: ffff9139e7510e40\n[56251.796278] FS:  0000000000000000(0000) GS:ffff9149afd80000(0000) knlGS:0000000000000000\n[56251.809133] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[56251.819561] CR2: 00007f5e85e6f300 CR3: 00000038b85e2006 CR4: 0000000000770ef0\n[56251.831365] PKRU: 55555554\n[56251.838653] Call Trace:\n[56251.845560]  <IRQ>\n[56251.851943]  cpu_map_enqueue.cold+0x5/0xa\n[56251.860243]  xdp_do_redirect+0x2d9/0x480\n[56251.868388]  bnxt_rx_xdp+0x1d8/0x4c0 [bnxt_en]\n[56251.877028]  bnxt_rx_pkt+0x5f7/0x19b0 [bnxt_en]\n[56251.885665]  ? cpu_max_write+0x1e/0x100\n[56251.893510]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.902276]  __bnxt_poll_work+0x190/0x340 [bnxt_en]\n[56251.911058]  bnxt_poll+0xab/0x1b0 [bnxt_en]\n[56251.919041]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.927568]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.935958]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.944250]  __napi_poll+0x2b/0x160\n[56251.951155]  bpf_trampoline_6442548651+0x79/0x123\n[56251.959262]  __napi_poll+0x5/0x160\n[56251.966037]  net_rx_action+0x3d2/0x880\n[56251.973133]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.981265]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56251.989262]  ? __hrtimer_run_queues+0x162/0x2a0\n[56251.996967]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56252.004875]  ? srso_alias_return_thunk+0x5/0xfbef5\n[56252.012673]  ? bnxt_msix+0x62/0x70 [bnxt_en]\n[56252.019903]  handle_softirqs+0xcf/0x270\n[56252.026650]  irq_exit_rcu+0x67/0x90\n[56252.032933]  common_interrupt+0x85/0xa0\n[56252.039498]  </IRQ>\n[56252.044246]  <TASK>\n[56252.048935]  asm_common_interrupt+0x26/0x40\n[56252.055727] RIP: 0010:cpuidle_enter_state+0xb8/0x420\n[56252.063305] Code: dc 01 00 00 e8 f9 79 3b ff e8 64 f7 ff ff 49 89 c5 0f 1f 44 00 00 31 ff e8 a5 32 3a ff 45 84 ff 0f 85 ae\n 01 00 00 fb 45 85 f6 <0f> 88 88 01 00 00 48 8b 04 24 49 63 ce 4c 89 ea 48 6b f1 68 48 29\n[56252.088911] RSP: 0018:ffff93120c97fe98 EFLAGS: 00000202\n[56252.096912] RAX: ffff9149afd80000 RBX: ffff9141d3a72800 RCX: 0000000000000000\n[56252.106844] RDX: 00003329176c6b98 RSI: ffffffe36db3fdc7 RDI: 0000000000000000\n[56252.116733] RBP: 0000000000000002 R08: 0000000000000002 R09: 000000000000004e\n[56252.126652] R10: ffff9149afdb30c4 R11: 071c71c71c71c71c R12: ffffffff985ff860\n[56252.136637] R13: 00003329176c6b98 R14: 0000000000000002 R15: 0000000000000000\n[56252.146667]  ? cpuidle_enter_state+0xab/0x420\n[56252.153909]  cpuidle_enter+0x2d/0x40\n[56252.160360]  do_idle+0x176/0x1c0\n[56252.166456\n---truncated---",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38246"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/16254aa985d14dee050564c4a3936f3dc096e1f7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6665b8f0f58082c480ed8627029f44d046ef2c8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/02bf488d56df9db4f5147280b65d9011e1ab88d2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9caca6ac0e26cd20efd490d8b3b2ffb1c7c00f6f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is triggered entirely by the mix of XDP verdicts produced for received network packets in a single NAPI poll, and those verdicts are decided from attacker-controlled packet headers. A remote unauthenticated attacker sending an interleaved packet stream to an internet-facing bnxt NIC reaches `bnxt_rx_xdp()` with no local access.\nAC:L - In the relevant deployment (a native-mode XDP program on bnxt that uses both XDP_TX and XDP_REDIRECT \u2014 the standard L4LB/DDoS-mitigation pattern for this NIC class), the attacker fully controls both sides: they only need one redirected packet followed by one XDP_TX packet within the same 64-packet NAPI batch, which is trivial at line rate. The fix author states the crash reproduces stably by simply returning the two actions randomly.\nPR:N - No authentication or privilege of any kind is needed \u2014 the attacker merely sends packets to the interface, and the vulnerable code runs in the NAPI receive path before any socket, credential, or namespace check.\nUI:N - Exploitation requires only inbound traffic processed by the driver's NAPI poll; no victim action is involved.\nS:U - The missed flush corrupts kernel list state and kernel stack memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `bq->flush_node` dangles into a destroyed `net_rx_action()` stack frame, so subsequent list traversal in `__cpu_map_flush`/`__dev_flush` interprets reused kernel stack memory as `struct xdp_bulk_queue` and can feed those contents to `bq_xmit_all()` \u2192 `ndo_xdp_xmit`, transmitting kernel memory out a network interface; unflushed xdp_frames also reference page_pool pages that the driver has already recycled.\nI:H - `__list_del_clearprev()` on the stale node writes 8-byte kernel pointers through dangling `prev`/`next` addresses into a kernel stack frame that has since been reused for other execution, corrupting saved registers, locals, and potentially return addresses \u2014 a memory-corruption primitive with control-flow implications rather than a mere crash.\nA:H - The defect produced a confirmed production kernel panic \u2014 `list_add corruption` \u2192 `kernel BUG at lib/list_debug.c:29` \u2192 invalid opcode oops in softirq/IRQ context on a 6.12 kernel, taking the machine down and requiring kdump."
    }
  }
}