CVE-2026-90173

{
  "id": "CVE-2026-90173",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:10.953",
  "lastModified": "2026-10-19T09:19:07.217",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: smbdirect: free completion queues with ib_free_cq()\n\nsmbdirect_connection_destroy_qp() creates the send and receive completion\nqueues with ib_alloc_cq_any(), which for IB_POLL_WORKQUEUE arms an\ninternal completion handler that runs ib_cq_poll_work() on a workqueue.\nTearing those CQs down with ib_destroy_cq() frees them without first\ncancelling that poll work.\n\nIf the provider posts a completion late -- for example Soft-RoCE (rxe)\nposting an RNR error from rxe_receiver() after rdma_destroy_qp() -- the\nhandler re-queues ib_cq_poll_work() on the already-freed CQ, and a\nfollow-on access faults in rxe_req_notify_cq().\n\nUse ib_free_cq(), which cancel_work_sync()es the poll work before freeing\nthe CQ, so no completion handler can run against a freed queue.\n\n[ 1236.599526] ==================================================================\n[ 1236.602142] BUG: KASAN: slab-use-after-free in ib_cq_poll_work+0xd0/0x1a0\n[ 1236.605524] Read of size 8 at addr ffff888111865800 by task kworker/4:1H/82\n[ 1236.609017]\n[ 1236.609270] CPU: 4 UID: 0 PID: 82 Comm: kworker/4:1H Not tainted 7.2.0-rc3-next-20260717-virtme #110 PREEMPT(lazy)\n[ 1236.609287] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n[ 1236.609498] Workqueue: ib-comp-wq ib_cq_poll_work\n[ 1236.609525] Call Trace:\n[ 1236.609536]  <TASK>\n[ 1236.609545]  __dump_stack+0x21/0x60\n[ 1236.609562]  dump_stack_lvl+0xc2/0x100\n[ 1236.609573]  print_address_description+0x77/0x200\n[ 1236.609587]  ? ib_cq_poll_work+0xd0/0x1a0\n[ 1236.609597]  print_report+0x58/0x70\n[ 1236.609607]  kasan_report+0x117/0x150\n[ 1236.609623]  ? ib_cq_poll_work+0xd0/0x1a0\n[ 1236.609636]  ? process_scheduled_works+0x954/0x1600\n[ 1236.609650]  ib_cq_poll_work+0xd0/0x1a0\n[ 1236.609662]  ? process_scheduled_works+0x954/0x1600\n[ 1236.609674]  process_scheduled_works+0xc22/0x1600\n[ 1236.609698]  ? __pfx_process_scheduled_works+0x10/0x10\n[ 1236.609713]  ? __pfx_assign_work+0x10/0x10\n[ 1236.609726]  ? lock_is_held_type+0x7b/0x110\n[ 1236.609741]  worker_thread+0x975/0xee0\n[ 1236.609757]  ? __pfx_do_raw_spin_lock+0x10/0x10\n[ 1236.609775]  ? __kthread_parkme+0x21e/0x260\n[ 1236.609789]  kthread+0x3a6/0x490\n[ 1236.609800]  ? __pfx_worker_thread+0x10/0x10\n[ 1236.609809]  ? __pfx_kthread+0x10/0x10\n[ 1236.609820]  ret_from_fork+0x55a/0xa20\n[ 1236.609835]  ? __pfx_ret_from_fork+0x10/0x10\n[ 1236.609850]  ? __pfx_kthread+0x10/0x10\n[ 1236.609861]  ret_from_fork_asm+0x1a/0x30\n[ 1236.609880]  </TASK>\n[ 1236.609886]\n[ 1236.661292] Allocated by task 5076:\n[ 1236.662640]  kasan_save_track+0x3e/0x80\n[ 1236.663842]  __kasan_kmalloc+0x72/0x90\n[ 1236.664763]  __kmalloc_noprof+0x2b0/0x5d0\n[ 1236.665356]  __ib_alloc_cq+0x284/0x1000\n[ 1236.666573]  __ib_alloc_cq_any+0x23e/0x340\n[ 1236.668654]  smbdirect_connection_create_qp+0x6f7/0x1070\n[ 1236.669757]  smbdirect_accept_connect_request+0x500/0x1ca0\n[ 1236.672625]  smbdirect_listen_rdma_event_handler+0x1655/0x1c50\n[ 1236.673930]  cma_listen_handler+0x1bf/0x260\n[ 1236.674923]  cma_cm_event_handler+0x128/0x380\n[ 1236.676926]  cma_ib_req_handler+0x2d3d/0x4de0\n[ 1236.678368]  cm_process_work+0xb0/0x530\n[ 1236.680454]  cm_queue_work_unlock+0xb1/0x230\n[ 1236.681673]  cm_work_handler+0x969f/0xdca0\n[ 1236.682704]  process_scheduled_works+0xc22/0x1600\n[ 1236.683447]  worker_thread+0x975/0xee0\n[ 1236.685901]  kthread+0x3a6/0x490\n[ 1236.688164]  ret_from_fork+0x55a/0xa20\n[ 1236.689522]  ret_from_fork_asm+0x1a/0x30\n[ 1236.690073]\n[ 1236.690378] Freed by task 5137:\n[ 1236.692242]  kasan_save_track+0x3e/0x80\n[ 1236.694272]  kasan_save_free_info+0x40/0x50\n[ 1236.695514]  __kasan_slab_free+0x3a/0x60\n[ 1236.696773]  kfree+0x14e/0x4e0\n[ 1236.697216]  ib_destroy_cq_user+0x18d/0x250\n[ 1236.699817]  smbdirect_connection_destroy_qp+0xf2/0x280\n[ 1236.702115]  smbdirect_socket_destroy_sync+0x1607/0x2720\n[ 1236.704062]  smbdirect_socket_release+0x140/0x280\n[ 1236.705286]  smb_direct_free_transpor\n---truncated---"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/smb/smbdirect/connection.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6073eb3e31756d569c4853fb22724525739d0e0c",
              "lessThan": "8a953b1a47fffb71e70767bc1e914401e3c2f27f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6073eb3e31756d569c4853fb22724525739d0e0c",
              "lessThan": "fe2c0cacbcff9d56c03b296f68f22151c4223b04",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/smb/smbdirect/connection.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "7.1",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/8a953b1a47fffb71e70767bc1e914401e3c2f27f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fe2c0cacbcff9d56c03b296f68f22151c4223b04",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}