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CVE-2026-92525

Estado: RecibidaAlta (7.1)—

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

RDMA/rxe: Validate num_sge/cur_sge before indexing wqe->dma.sge[]

For a user QP, qp->sq.queue is a ring the application writes directly, so rxe_post_send() takes the is_user branch and only schedules send_task without validating the WQE. rxe_requester() consumes it in place via req_next_wqe() and calls copy_data(), which indexes &wqe->dma.sge[cur_sge] with the attacker-controlled num_sge/cur_sge. Only the kernel path bounds num_sge (validate_send_wr()); the user WQE is never checked, so a local unprivileged user can post a WQE with an out-of-range cur_sge or oversized num_sge and force an out-of-bounds read of the per-WQE sge array in copy_data() (vmalloc OOB read, local DoS).

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Bound num_sge to qp->sq.max_sge in rxe_requester() before use, the way get_srq_wqe() already guards SRQ entries, and bound cur_sge only when the WQE carries payload (dma.resid): copy_data() returns early on a zero-length copy before touching dma->sge[], so a zero-payload WQE -- the only kind a max_sge == 0 QP can post -- stays valid.

Reproduced under KASAN; the vmalloc-out-of-bounds in copy_data() is gone.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad de escalada de privilegios en kernel Linux (AV:L, PR:L) explotable por usuario local no privilegiado para causar DoS mediante lectura fuera de límites en estructura de datos del kernel.

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

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

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

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-92525",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "69d3ccf6543f24c452a020c8028ca6f46cb1e8db",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "750bba6ce9bb0b11d6a166031c9728ae3f21765e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "c067aa7b231e91a18a1b3666201ab14dfb00347a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "13cb7160e5b791f5e3ecf9311cf32849fe7e9b62",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "5ec111ddc1f727c1e4580aea459842ae5a8359a5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "lessThan": "126c757e4cd46f866ddc283143b58eb4d9bf52cd",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_req.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_req.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:55.540",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/126c757e4cd46f866ddc283143b58eb4d9bf52cd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/13cb7160e5b791f5e3ecf9311cf32849fe7e9b62",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ec111ddc1f727c1e4580aea459842ae5a8359a5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/69d3ccf6543f24c452a020c8028ca6f46cb1e8db",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/750bba6ce9bb0b11d6a166031c9728ae3f21765e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c067aa7b231e91a18a1b3666201ab14dfb00347a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate num_sge/cur_sge before indexing wqe->dma.sge[]\n\nFor a user QP, qp->sq.queue is a ring the application writes directly,\nso rxe_post_send() takes the is_user branch and only schedules send_task\nwithout validating the WQE. rxe_requester() consumes it in place via\nreq_next_wqe() and calls copy_data(), which indexes\n&wqe->dma.sge[cur_sge] with the attacker-controlled num_sge/cur_sge.\nOnly the kernel path bounds num_sge (validate_send_wr()); the user WQE\nis never checked, so a local unprivileged user can post a WQE with an\nout-of-range cur_sge or oversized num_sge and force an out-of-bounds\nread of the per-WQE sge array in copy_data() (vmalloc OOB read, local\nDoS).\n\nBound num_sge to qp->sq.max_sge in rxe_requester() before use, the way\nget_srq_wqe() already guards SRQ entries, and bound cur_sge only when\nthe WQE carries payload (dma.resid): copy_data() returns early on a\nzero-length copy before touching dma->sge[], so a zero-payload WQE --\nthe only kind a max_sge == 0 QP can post -- stays valid.\n\nReproduced under KASAN; the vmalloc-out-of-bounds in copy_data() is gone."
    }
  ],
  "lastModified": "2026-09-18T18:18:14.300",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}