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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: correct handling of extreme memory squeeze\n\nTesting with iperf3 using the \"pasta\" protocol splicer has revealed\na problem in the way tcp handles window advertising in extreme memory\nsqueeze situations.\n\nUnder memory pressure, a socket endpoint may temporarily advertise\na zero-sized window, but this is not stored as part of the socket data.\nThe reasoning behind this is that it is considered a temporary setting\nwhich shouldn\u0027t influence any further calculations.\n\nHowever, if we happen to stall at an unfortunate value of the current\nwindow size, the algorithm selecting a new value will consistently fail\nto advertise a non-zero window once we have freed up enough memory.\nThis means that this side\u0027s notion of the current window size is\ndifferent from the one last advertised to the peer, causing the latter\nto not send any data to resolve the sitution.\n\nThe problem occurs on the iperf3 server side, and the socket in question\nis a completely regular socket with the default settings for the\nfedora40 kernel. We do not use SO_PEEK or SO_RCVBUF on the socket.\n\nThe following excerpt of a logging session, with own comments added,\nshows more in detail what is happening:\n\n//              tcp_v4_rcv(-\u003e)\n//                tcp_rcv_established(-\u003e)\n[5201\u003c-\u003e39222]:     ==== Activating log @ net/ipv4/tcp_input.c/tcp_data_queue()/5257 ====\n[5201\u003c-\u003e39222]:     tcp_data_queue(-\u003e)\n[5201\u003c-\u003e39222]:        DROPPING skb [265600160..265665640], reason: SKB_DROP_REASON_PROTO_MEM\n                       [rcv_nxt 265600160, rcv_wnd 262144, snt_ack 265469200, win_now 131184]\n                       [copied_seq 259909392-\u003e260034360 (124968), unread 5565800, qlen 85, ofoq 0]\n                       [OFO queue: gap: 65480, len: 0]\n[5201\u003c-\u003e39222]:     tcp_data_queue(\u003c-)\n[5201\u003c-\u003e39222]:     __tcp_transmit_skb(-\u003e)\n                        [tp-\u003ercv_wup: 265469200, tp-\u003ercv_wnd: 262144, tp-\u003ercv_nxt 265600160]\n[5201\u003c-\u003e39222]:       tcp_select_window(-\u003e)\n[5201\u003c-\u003e39222]:         (inet_csk(sk)-\u003eicsk_ack.pending \u0026 ICSK_ACK_NOMEM) ? --\u003e TRUE\n                        [tp-\u003ercv_wup: 265469200, tp-\u003ercv_wnd: 262144, tp-\u003ercv_nxt 265600160]\n                        returning 0\n[5201\u003c-\u003e39222]:       tcp_select_window(\u003c-)\n[5201\u003c-\u003e39222]:       ADVERTISING WIN 0, ACK_SEQ: 265600160\n[5201\u003c-\u003e39222]:     [__tcp_transmit_skb(\u003c-)\n[5201\u003c-\u003e39222]:   tcp_rcv_established(\u003c-)\n[5201\u003c-\u003e39222]: tcp_v4_rcv(\u003c-)\n\n// Receive queue is at 85 buffers and we are out of memory.\n// We drop the incoming buffer, although it is in sequence, and decide\n// to send an advertisement with a window of zero.\n// We don\u0027t update tp-\u003ercv_wnd and tp-\u003ercv_wup accordingly, which means\n// we unconditionally shrink the window.\n\n[5201\u003c-\u003e39222]: tcp_recvmsg_locked(-\u003e)\n[5201\u003c-\u003e39222]:   __tcp_cleanup_rbuf(-\u003e) tp-\u003ercv_wup: 265469200, tp-\u003ercv_wnd: 262144, tp-\u003ercv_nxt 265600160\n[5201\u003c-\u003e39222]:     [new_win = 0, win_now = 131184, 2 * win_now = 262368]\n[5201\u003c-\u003e39222]:     [new_win \u003e= (2 * win_now) ? --\u003e time_to_ack = 0]\n[5201\u003c-\u003e39222]:     NOT calling tcp_send_ack()\n                    [tp-\u003ercv_wup: 265469200, tp-\u003ercv_wnd: 262144, tp-\u003ercv_nxt 265600160]\n[5201\u003c-\u003e39222]:   __tcp_cleanup_rbuf(\u003c-)\n                  [rcv_nxt 265600160, rcv_wnd 262144, snt_ack 265469200, win_now 131184]\n                  [copied_seq 260040464-\u003e260040464 (0), unread 5559696, qlen 85, ofoq 0]\n                  returning 6104 bytes\n[5201\u003c-\u003e39222]: tcp_recvmsg_locked(\u003c-)\n\n// After each read, the algorithm for calculating the new receive\n// window in __tcp_cleanup_rbuf() finds it is too small to advertise\n// or to update tp-\u003ercv_wnd.\n// Meanwhile, the peer thinks the window is zero, and will not send\n// any more data to trigger an update from the interrupt mode side.\n\n[5201\u003c-\u003e39222]: tcp_recvmsg_locked(-\u003e)\n[5201\u003c-\u003e39222]:   __tcp_cleanup_rbuf(-\u003e) tp-\u003ercv_wup: 265469200, tp-\u003ercv_wnd: 262144, tp-\u003ercv_nxt 265600160\n[5201\u003c-\u003e39222]:     [new_win = 262144, win_now = 131184, 2 * win_n\n---truncated---"
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              "value": "AV:N - The bug is in the core TCP receive/output path (`tcp_select_window` via `tcp_data_queue`) and is triggered purely by the traffic pattern of a remote peer driving the receive socket into memory squeeze. Any routable TCP service \u2014 HTTP, SSH, ksmbd, nfsd, database \u2014 is reachable over the network.\nAC:L - The attacker controls both preconditions: skb truesize amplification lets a flood of small segments exhaust `sk_rmem_alloc`/`tcp_mem` while consuming little sequence space, which reliably leaves `tcp_receive_window()` above half the maximum at squeeze time \u2014 exactly the state that makes the `new_window \u003e= 2 * rcv_window_now` test in `__tcp_cleanup_rbuf()` permanently unsatisfiable \u2014 and the attacker then simply declines to send zero-window probes, which is the only recovery path.\nPR:N - No authentication or privilege is needed; the condition is reached in `tcp_data_queue()` on established connections before any application-layer authentication, so any unauthenticated client of any TCP listener can drive it.\nUI:N - Triggering requires only that the target socket receive attacker-supplied data; no action by a local user or administrator is involved.\nS:U - The inconsistent window state and the resulting stall are confined to the kernel TCP stack and the sockets it owns, with no crossing of a security authority boundary.\nC:N - No uninitialized, out-of-bounds, or freed memory is read or transmitted; the defect is limited to bookkeeping of `tp-\u003ercv_wnd`/`tp-\u003ercv_wup` and produces no disclosure of kernel or other sockets\u0027 data.\nI:L - The attacker causes the connection\u0027s protocol state to be left incorrect \u2014 the stored receive window diverges from what was advertised, and the fix explicitly notes the pre-fix path transmits regressing `th-\u003eack_seq` values that are \"wrong from a protocol viewpoint\" \u2014 pinning the peer\u0027s `snd_wnd` at a bogus zero; the modification is bounded and its consequences are not attacker-directed.\nA:H - The connection enters a permanent deadlock \u2014 the receive queue empties but no window update is ever sent and the peer never transmits again \u2014 indefinitely pinning a socket and, for blocking servers, a worker thread; repeated across many connections this exhausts a server\u0027s connection and thread pools, and TCP keepalive is disabled by default so nothing breaks the stall."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: cleanup mana struct after debugfs_remove()\n\nWhen on a MANA VM hibernation is triggered, as part of hibernate_snapshot(),\nmana_gd_suspend() and mana_gd_resume() are called. If during this\nmana_gd_resume(), a failure occurs with HWC creation, mana_port_debugfs\npointer does not get reinitialized and ends up pointing to older,\ncleaned-up dentry.\nFurther in the hibernation path, as part of power_down(), mana_gd_shutdown()\nis triggered. This call, unaware of the failures in resume, tries to cleanup\nthe already cleaned up  mana_port_debugfs value and hits the following bug:\n\n[  191.359296] mana 7870:00:00.0: Shutdown was called\n[  191.359918] BUG: kernel NULL pointer dereference, address: 0000000000000098\n[  191.360584] #PF: supervisor write access in kernel mode\n[  191.361125] #PF: error_code(0x0002) - not-present page\n[  191.361727] PGD 1080ea067 P4D 0\n[  191.362172] Oops: Oops: 0002 [#1] SMP NOPTI\n[  191.362606] CPU: 11 UID: 0 PID: 1674 Comm: bash Not tainted 6.14.0-rc5+ #2\n[  191.363292] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/21/2024\n[  191.364124] RIP: 0010:down_write+0x19/0x50\n[  191.364537] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 de cd ff ff 31 c0 ba 01 00 00 00 \u003cf0\u003e 48 0f b1 13 75 16 65 48 8b 05 88 24 4c 6a 48 89 43 08 48 8b 5d\n[  191.365867] RSP: 0000:ff45fbe0c1c037b8 EFLAGS: 00010246\n[  191.366350] RAX: 0000000000000000 RBX: 0000000000000098 RCX: ffffff8100000000\n[  191.366951] RDX: 0000000000000001 RSI: 0000000000000064 RDI: 0000000000000098\n[  191.367600] RBP: ff45fbe0c1c037c0 R08: 0000000000000000 R09: 0000000000000001\n[  191.368225] R10: ff45fbe0d2b01000 R11: 0000000000000008 R12: 0000000000000000\n[  191.368874] R13: 000000000000000b R14: ff43dc27509d67c0 R15: 0000000000000020\n[  191.369549] FS:  00007dbc5001e740(0000) GS:ff43dc663f380000(0000) knlGS:0000000000000000\n[  191.370213] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  191.370830] CR2: 0000000000000098 CR3: 0000000168e8e002 CR4: 0000000000b73ef0\n[  191.371557] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  191.372192] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400\n[  191.372906] Call Trace:\n[  191.373262]  \u003cTASK\u003e\n[  191.373621]  ? show_regs+0x64/0x70\n[  191.374040]  ? __die+0x24/0x70\n[  191.374468]  ? page_fault_oops+0x290/0x5b0\n[  191.374875]  ? do_user_addr_fault+0x448/0x800\n[  191.375357]  ? exc_page_fault+0x7a/0x160\n[  191.375971]  ? asm_exc_page_fault+0x27/0x30\n[  191.376416]  ? down_write+0x19/0x50\n[  191.376832]  ? down_write+0x12/0x50\n[  191.377232]  simple_recursive_removal+0x4a/0x2a0\n[  191.377679]  ? __pfx_remove_one+0x10/0x10\n[  191.378088]  debugfs_remove+0x44/0x70\n[  191.378530]  mana_detach+0x17c/0x4f0\n[  191.378950]  ? __flush_work+0x1e2/0x3b0\n[  191.379362]  ? __cond_resched+0x1a/0x50\n[  191.379787]  mana_remove+0xf2/0x1a0\n[  191.380193]  mana_gd_shutdown+0x3b/0x70\n[  191.380642]  pci_device_shutdown+0x3a/0x80\n[  191.381063]  device_shutdown+0x13e/0x230\n[  191.381480]  kernel_power_off+0x35/0x80\n[  191.381890]  hibernate+0x3c6/0x470\n[  191.382312]  state_store+0xcb/0xd0\n[  191.382734]  kobj_attr_store+0x12/0x30\n[  191.383211]  sysfs_kf_write+0x3e/0x50\n[  191.383640]  kernfs_fop_write_iter+0x140/0x1d0\n[  191.384106]  vfs_write+0x271/0x440\n[  191.384521]  ksys_write+0x72/0xf0\n[  191.384924]  __x64_sys_write+0x19/0x20\n[  191.385313]  x64_sys_call+0x2b0/0x20b0\n[  191.385736]  do_syscall_64+0x79/0x150\n[  191.386146]  ? __mod_memcg_lruvec_state+0xe7/0x240\n[  191.386676]  ? __lruvec_stat_mod_folio+0x79/0xb0\n[  191.387124]  ? __pfx_lru_add+0x10/0x10\n[  191.387515]  ? queued_spin_unlock+0x9/0x10\n[  191.387937]  ? do_anonymous_page+0x33c/0xa00\n[  191.388374]  ? __handle_mm_fault+0xcf3/0x1210\n[  191.388805]  ? __count_memcg_events+0xbe/0x180\n[  191.389235]  ? handle_mm_fault+0xae/0x300\n[  19\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:09:44.295Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a1466112fb6e819261272ad75e7db750a43b78bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e64bb2ae7d9f2b3a8259d4d6b86ed1984d5460a"
        }
      ],
      "title": "net: mana: cleanup mana struct after debugfs_remove()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21953",
    "datePublished": "2025-04-01T15:46:54.712Z",
    "dateReserved": "2024-12-29T08:45:45.790Z",
    "dateUpdated": "2026-05-11T21:09:44.295Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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{
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            "defaultStatus": "unknown",
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              {
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        "providerMetadata": {
          "dateUpdated": "2026-10-15T01:06:59.431Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
          }
        ],
        "x_adpType": "supplier"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-38250",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:48:58.439628Z",
                "version": "2.0.3"
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        {
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          "product": "Linux",
          "programFiles": [
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            "net/bluetooth/hci_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "3.4"
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            {
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
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              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.36",
              "versionType": "semver"
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              "version": "6.15.5",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
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                  "vulnerable": true
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                {
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Fix use-after-free in vhci_flush()\n\nsyzbot reported use-after-free in vhci_flush() without repro. [0]\n\nFrom the splat, a thread close()d a vhci file descriptor while\nits device was being used by iotcl() on another thread.\n\nOnce the last fd refcnt is released, vhci_release() calls\nhci_unregister_dev(), hci_free_dev(), and kfree() for struct\nvhci_data, which is set to hci_dev-\u003edev-\u003edriver_data.\n\nThe problem is that there is no synchronisation after unlinking\nhdev from hci_dev_list in hci_unregister_dev().  There might be\nanother thread still accessing the hdev which was fetched before\nthe unlink operation.\n\nWe can use SRCU for such synchronisation.\n\nLet\u0027s run hci_dev_reset() under SRCU and wait for its completion\nin hci_unregister_dev().\n\nAnother option would be to restore hci_dev-\u003edestruct(), which was\nremoved in commit 587ae086f6e4 (\"Bluetooth: Remove unused\nhci-destruct cb\").  However, this would not be a good solution, as\nwe should not run hci_unregister_dev() while there are in-flight\nioctl() requests, which could lead to another data-race KCSAN splat.\n\nNote that other drivers seem to have the same problem, for exmaple,\nvirtbt_remove().\n\n[0]:\nBUG: KASAN: slab-use-after-free in skb_queue_empty_lockless include/linux/skbuff.h:1891 [inline]\nBUG: KASAN: slab-use-after-free in skb_queue_purge_reason+0x99/0x360 net/core/skbuff.c:3937\nRead of size 8 at addr ffff88807cb8d858 by task syz.1.219/6718\n\nCPU: 1 UID: 0 PID: 6718 Comm: syz.1.219 Not tainted 6.16.0-rc1-syzkaller-00196-g08207f42d3ff #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xd2/0x2b0 mm/kasan/report.c:521\n kasan_report+0x118/0x150 mm/kasan/report.c:634\n skb_queue_empty_lockless include/linux/skbuff.h:1891 [inline]\n skb_queue_purge_reason+0x99/0x360 net/core/skbuff.c:3937\n skb_queue_purge include/linux/skbuff.h:3368 [inline]\n vhci_flush+0x44/0x50 drivers/bluetooth/hci_vhci.c:69\n hci_dev_do_reset net/bluetooth/hci_core.c:552 [inline]\n hci_dev_reset+0x420/0x5c0 net/bluetooth/hci_core.c:592\n sock_do_ioctl+0xd9/0x300 net/socket.c:1190\n sock_ioctl+0x576/0x790 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fcf5b98e929\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fcf5c7b9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007fcf5bbb6160 RCX: 00007fcf5b98e929\nRDX: 0000000000000000 RSI: 00000000400448cb RDI: 0000000000000009\nRBP: 00007fcf5ba10b39 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 0000000000000000 R14: 00007fcf5bbb6160 R15: 00007ffd6353d528\n \u003c/TASK\u003e\n\nAllocated by task 6535:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]\n __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1039 [inline]\n vhci_open+0x57/0x360 drivers/bluetooth/hci_vhci.c:635\n misc_open+0x2bc/0x330 drivers/char/misc.c:161\n chrdev_open+0x4c9/0x5e0 fs/char_dev.c:414\n do_dentry_open+0xdf0/0x1970 fs/open.c:964\n vfs_open+0x3b/0x340 fs/open.c:1094\n do_open fs/namei.c:3887 [inline]\n path_openat+0x2ee5/0x3830 fs/name\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Although this is the Bluetooth subsystem, the vulnerable path is not reachable from over-the-air traffic \u2014 it requires a local `ioctl(HCIDEVRESET)` on an AF_BLUETOOTH HCI socket raced against a local `close()` of the transport fd (or driver removal). Both sides of the race are local syscalls.\nAC:L - The attacker controls both racing threads (close of the vhci fd vs. the HCIDEVRESET ioctl) and the window is large, spanning the full `hci_dev_close_sync()`/`hci_dev_open_sync()` command-sync sequence inside `hci_dev_do_reset()`. Failed attempts are harmless and can be repeated indefinitely until the race is won.\nPR:L - `HCIDEVRESET` is gated on `capable(CAP_NET_ADMIN)`, a capability held by non-root service accounts such as bluetoothd and Android\u0027s Bluetooth process rather than requiring full init-namespace root, and this repo consistently scores CAP_NET_ADMIN-gated Bluetooth mgmt/ioctl bugs as PR:L. The free side additionally needs no privilege at all when supplied by ordinary transport-driver teardown (btusb/hci_ldisc/virtio_bt unregister).\nUI:N - The attacker drives both the reset ioctl and the device teardown from its own threads with no victim participation. No user action of any kind is needed.\nS:U - The use-after-free corrupts kernel heap memory and yields kernel-privilege compromise within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free on a `kmalloc-1k` object; `skb_queue_purge_reason()` reads the freed `sk_buff_head` and dereferences pointers taken from it, so an attacker who reclaims the slot obtains an arbitrary kernel-memory read primitive and full disclosure of kernel memory.\nI:H - The UAF is read *and* write: `skb_queue_splice_init()` writes back into the freed object and `kfree_skb()` is invoked on attacker-reclaimable pointers, while `vhci_send_frame()` performs `skb_queue_tail()` into freed memory. That combination gives a controlled-free and linked-list-write primitive suitable for control-flow hijacking and privilege escalation.\nA:H - Even without successful heap grooming, purging a freed skb queue and freeing garbage pointers reliably corrupts the slab allocator and panics the kernel. The attacker can trigger it repeatedly for a persistent denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:00:43.317Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dd4becd3fd4102696e1c15e6d260a1712a2d8685"
        },
        {
          "url": "https://git.kernel.org/stable/c/90dee0a0ff84fac8accd5be98412b3819f667149"
        },
        {
          "url": "https://git.kernel.org/stable/c/c56b177efce8b62798e4d96bdb9867106cb7c4a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc0819a25e04cd68ef3568cfa51b63118fea39a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce23b73f0f27e2dbeb81734a79db710f05aa33c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e5c144c557df910ab64d9c25d06399a9a735e65"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d6123102e9fbedc8d25bf4731da6d513173e49e"
        }
      ],
      "title": "Bluetooth: hci_core: Fix use-after-free in vhci_flush()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38250",
    "datePublished": "2025-07-09T10:42:30.294Z",
    "dateReserved": "2025-04-16T04:51:23.997Z",
    "dateUpdated": "2026-10-15T21:52:12.635Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.254",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.204",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.170",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.137",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.85",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.254",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.204",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.85",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
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                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings.  Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable algif_aead path is reached through local AF_ALG socket syscalls: socket, bind, setsockopt, accept, sendmsg, and recvmsg. It is not directly reachable from remote network packets.\nAC:L - A local attacker can construct the AF_ALG AEAD request, choose buffer layout, AAD/tag lengths, and invoke recvmsg directly. Any race or SGL layout condition is attacker-controlled from the same process.\nPR:L - Creating and using AF_ALG AEAD sockets requires only an unprivileged local user on systems with CRYPTO_USER_API_AEAD enabled. The traced socket, bind, setsockopt, accept, sendmsg, and recvmsg paths do not require CAP_SYS_ADMIN or other real root privileges.\nUI:N - No victim interaction is needed once the attacker has local code execution. The attacker can open and drive the AF_ALG socket entirely through syscalls.\nS:U - The issue remains within the kernel/user crypto API security authority and does not cross a VM, IOMMU, or separate sandbox boundary. This is a standard local kernel attack surface.\nC:H - The removed in-place AEAD design used user-writable RX scatterlists as crypto source data and chained TX tag pages, creating a plausible decryption/authentication bypass for data protected by secret AEAD keys. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The bug undermines AEAD authenticity by allowing source data used by the crypto operation to diverge from the data originally submitted and authenticated. This can allow forged or corrupted plaintext/ciphertext results, so integrity impact is high.\nA:H - The vulnerable path builds complex chained scatterlists from attacker-controlled local buffers and related AF_ALG fixes show these paths can lead to scatterwalk NULL dereferences and kernel panics. A local attacker can repeatedly trigger the operation, so availability impact is high."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:22:25.522Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667"
        },
        {
          "url": "https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c"
        },
        {
          "url": "https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82"
        },
        {
          "url": "https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237"
        },
        {
          "url": "https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5"
        }
      ],
      "title": "crypto: algif_aead - Revert to operating out-of-place",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31431",
    "datePublished": "2026-04-22T08:15:10.123Z",
    "dateReserved": "2026-03-09T15:48:24.089Z",
    "dateUpdated": "2026-10-15T01:16:12.771Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}