CVE-2026-90172

Estado: RecibidaAlta (7.5)—

In the Linux kernel, the following vulnerability has been resolved:

smb: smbdirect: destroy QP before mem pools on accept failure

On the rdma_accept_failed error path of smbdirect_accept_connect_request(), the receive io posted just above is owned by the QP (recv_io is set to NULL after a successful post). The error path fell through to smbdirect_connection_destroy_mem_pools() before smbdirect_connection_destroy_qp(), so the mem pools and the recv_io slab cache were destroyed while that recv_io was still outstanding on the QP.

The drain in smbdirect_connection_destroy_qp() (ib_drain_qp()) is what runs the recv completion that returns the recv_io to the free list, so destroying the pools first leaves the object outstanding at kmem_cache_destroy() time ("Slab cache still has objects") and later frees it into an already-destroyed mempool (mempool_free_bulk NULL-pointer dereference).

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Give rdma_accept_failed its own teardown that drains the QP first, then destroys the mem pools, and returns. The remaining labels (post_recv_io_failed onward) run before the recv_io was ever posted, so they keep the mem-pools-then-qp order.

The outstanding recv_io at kmem_cache_destroy() time:

Detalles técnicos trazas, registros y código del informe original

[ 3487.344647] =============================================================================
[ 3487.349942] BUG smbdirect_recv_io_cache_ffff88811ba99000 (Not tainted): Objects remaining on __kmem_cache_shutdown()
[ 3487.356078] -----------------------------------------------------------------------------
[ 3487.356078]
[ 3487.356738] Object 0xffff8881511c3440 @offset=13376
[ 3487.358464] Allocated in mempool_alloc_noprof+0x18c/0x290 age=1194 cpu=6 pid=22254
[ 3487.361197]  mempool_alloc_noprof+0x18c/0x290
[ 3487.361542]  smbdirect_connection_create_mem_pools+0x405/0x780
[ 3487.361972]  smbdirect_accept_connect_request+0x5a8/0x1b80
[ 3487.362359]  smbdirect_listen_rdma_event_handler+0x1579/0x1b90
[ 3487.362779]  cma_cm_event_handler+0x9c/0x230
[ 3487.363096]  cma_ib_req_handler+0x2682/0x45d0
[ 3487.363414]  cm_process_work+0x56/0x3d0
[ 3487.363676]  cm_work_handler+0x8a0e/0xd000
[ 3487.367496]  process_scheduled_works+0xa07/0x13a0
[ 3487.367859]  worker_thread+0x7c9/0xc80
[ 3487.368148]  kthread+0x341/0x430
[ 3487.368407]  ret_from_fork+0x3a8/0x7a0
[ 3487.368704]  ret_from_fork_asm+0x1a/0x30
[ 3487.370307] Slab 0xffffea0005447000 objects=19 used=1 fp=0xffff8881511c0040 flags=0x100000000000240(workingset|head|node=0|zone=2)
[ 3487.372840] ------------[ cut here ]------------
[ 3487.373195] WARNING: mm/slub.c:1244 at __slab_err+0x1a/0x30, CPU#6: kworker/6:84/22254
[ 3487.373759] Modules linked in:
[ 3487.373993] CPU: 6 UID: 0 PID: 22254 Comm: kworker/6:84 Tainted: G    B               7.1.0-next-20260623+ #88 PREEMPT(lazy)
[ 3487.374778] Tainted: [B]=BAD_PAGE
[ 3487.377830] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014
[ 3487.378515] Workqueue: ib_cm cm_work_handler
[ 3487.378820] RIP: 0010:__slab_err+0x1a/0x30
[ 3487.379129] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 e8 36 00 00 00 bf 05 00 00 00 be 01 00 00 00 e8 f7 75 45 00 90 <0f> 0b 90 c3 cc cc cc cc cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
[ 3487.383255] RSP: 0018:ffff888220fc7050 EFLAGS: 00010093
[ 3487.383643] RAX: ffffffff8168e60a RBX: ffff88810955e640 RCX: ffff88821c381d80
[ 3487.384158] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff870fa080
[ 3487.384662] RBP: ffff888220fc7068 R08: ffffffff870fa087 R09: 1ffffffff0e1f410
[ 3487.385192] R10: dffffc0000000000 R11: fffffbfff0e1f411 R12: ffffea0005447210
[ 3487.385674] R13: ffffea0005447000 R14: ffff888220fc7068 R15: ffff88812a8ab300
[ 3487.388932] FS:  0000000000000000(0000) GS:ffff888427e76000(0000) knlGS:0000000000000000
[ 3487.389529] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3487.389934] CR2: 00007ffcf2d84fd8 CR3: 0000000111d64006 CR4: 0000000000f72ef0
[ 3487.390440] PKRU: 55555554
[ 3487.390641] Call Trace:
[ 3487.390826]  <TASK>
[ 3
---truncated---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.49%
Percentil entre todas las CVEs puntuadas: 40
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access25 %
Impacto principalT1499.004 Application or System Exploitationimpact70 %

Vulnerabilidad de DoS en kernel Linux por mal manejo de recursos RDMA en SMBDirect; vector AV:N pero requiere conexión específica, impacto alta disponibilidad por crash/NULL-dereference.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-90172",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "eb3ed1e9048cf7b2a38112f48e0f1b772bb7860d",
              "lessThan": "959813a3752b459ed77b0b3eaf30b9f4c6204260",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "eb3ed1e9048cf7b2a38112f48e0f1b772bb7860d",
              "lessThan": "383a9480f5f40bc46454cce27ccfad532cedad9c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/smbdirect/accept.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/smbdirect/accept.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:10.820",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/383a9480f5f40bc46454cce27ccfad532cedad9c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/959813a3752b459ed77b0b3eaf30b9f4c6204260",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: smbdirect: destroy QP before mem pools on accept failure\n\nOn the rdma_accept_failed error path of\nsmbdirect_accept_connect_request(), the receive io posted just above is\nowned by the QP (recv_io is set to NULL after a successful post).  The\nerror path fell through to smbdirect_connection_destroy_mem_pools()\nbefore smbdirect_connection_destroy_qp(), so the mem pools and the\nrecv_io slab cache were destroyed while that recv_io was still\noutstanding on the QP.\n\nThe drain in smbdirect_connection_destroy_qp() (ib_drain_qp()) is what\nruns the recv completion that returns the recv_io to the free list, so\ndestroying the pools first leaves the object outstanding at\nkmem_cache_destroy() time (\"Slab cache still has objects\") and later\nfrees it into an already-destroyed mempool (mempool_free_bulk\nNULL-pointer dereference).\n\nGive rdma_accept_failed its own teardown that drains the QP first, then\ndestroys the mem pools, and returns.  The remaining labels\n(post_recv_io_failed onward) run before the recv_io was ever posted, so\nthey keep the mem-pools-then-qp order.\n\nThe outstanding recv_io at kmem_cache_destroy() time:\n\n[ 3487.344647] =============================================================================\n[ 3487.349942] BUG smbdirect_recv_io_cache_ffff88811ba99000 (Not tainted): Objects remaining on __kmem_cache_shutdown()\n[ 3487.356078] -----------------------------------------------------------------------------\n[ 3487.356078]\n[ 3487.356738] Object 0xffff8881511c3440 @offset=13376\n[ 3487.358464] Allocated in mempool_alloc_noprof+0x18c/0x290 age=1194 cpu=6 pid=22254\n[ 3487.361197]  mempool_alloc_noprof+0x18c/0x290\n[ 3487.361542]  smbdirect_connection_create_mem_pools+0x405/0x780\n[ 3487.361972]  smbdirect_accept_connect_request+0x5a8/0x1b80\n[ 3487.362359]  smbdirect_listen_rdma_event_handler+0x1579/0x1b90\n[ 3487.362779]  cma_cm_event_handler+0x9c/0x230\n[ 3487.363096]  cma_ib_req_handler+0x2682/0x45d0\n[ 3487.363414]  cm_process_work+0x56/0x3d0\n[ 3487.363676]  cm_work_handler+0x8a0e/0xd000\n[ 3487.367496]  process_scheduled_works+0xa07/0x13a0\n[ 3487.367859]  worker_thread+0x7c9/0xc80\n[ 3487.368148]  kthread+0x341/0x430\n[ 3487.368407]  ret_from_fork+0x3a8/0x7a0\n[ 3487.368704]  ret_from_fork_asm+0x1a/0x30\n[ 3487.370307] Slab 0xffffea0005447000 objects=19 used=1 fp=0xffff8881511c0040 flags=0x100000000000240(workingset|head|node=0|zone=2)\n[ 3487.372840] ------------[ cut here ]------------\n[ 3487.373195] WARNING: mm/slub.c:1244 at __slab_err+0x1a/0x30, CPU#6: kworker/6:84/22254\n[ 3487.373759] Modules linked in:\n[ 3487.373993] CPU: 6 UID: 0 PID: 22254 Comm: kworker/6:84 Tainted: G    B               7.1.0-next-20260623+ #88 PREEMPT(lazy)\n[ 3487.374778] Tainted: [B]=BAD_PAGE\n[ 3487.377830] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n[ 3487.378515] Workqueue: ib_cm cm_work_handler\n[ 3487.378820] RIP: 0010:__slab_err+0x1a/0x30\n[ 3487.379129] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 e8 36 00 00 00 bf 05 00 00 00 be 01 00 00 00 e8 f7 75 45 00 90 <0f> 0b 90 c3 cc cc cc cc cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00\n[ 3487.383255] RSP: 0018:ffff888220fc7050 EFLAGS: 00010093\n[ 3487.383643] RAX: ffffffff8168e60a RBX: ffff88810955e640 RCX: ffff88821c381d80\n[ 3487.384158] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff870fa080\n[ 3487.384662] RBP: ffff888220fc7068 R08: ffffffff870fa087 R09: 1ffffffff0e1f410\n[ 3487.385192] R10: dffffc0000000000 R11: fffffbfff0e1f411 R12: ffffea0005447210\n[ 3487.385674] R13: ffffea0005447000 R14: ffff888220fc7068 R15: ffff88812a8ab300\n[ 3487.388932] FS:  0000000000000000(0000) GS:ffff888427e76000(0000) knlGS:0000000000000000\n[ 3487.389529] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 3487.389934] CR2: 00007ffcf2d84fd8 CR3: 0000000111d64006 CR4: 0000000000f72ef0\n[ 3487.390440] PKRU: 55555554\n[ 3487.390641] Call Trace:\n[ 3487.390826]  <TASK>\n[ 3\n---truncated---"
    }
  ],
  "lastModified": "2026-09-18T18:17:45.017",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}