CVE-2026-93154 (GCVE-0-2026-93154)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-18 17:56
VLAI
Title
RDMA/irdma: Add refcounting to user ring MRs
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Add refcounting to user ring MRs Prevent userspace from deregistering the MRs that back QP/CQ/SRQ rings by bumping the MR's refcount upon association.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < 07974c267f603a76aead348bca97deee95efdcc9 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < f67d8a08f60c9217df6d40da56422d2049f5e334 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/irdma/utils.c",
            "drivers/infiniband/hw/irdma/verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "07974c267f603a76aead348bca97deee95efdcc9",
              "status": "affected",
              "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08",
              "versionType": "git"
            },
            {
              "lessThan": "a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b",
              "status": "affected",
              "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08",
              "versionType": "git"
            },
            {
              "lessThan": "f67d8a08f60c9217df6d40da56422d2049f5e334",
              "status": "affected",
              "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08",
              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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            "drivers/infiniband/hw/irdma/verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Add refcounting to user ring MRs\n\nPrevent userspace from deregistering the MRs that back QP/CQ/SRQ rings\nby bumping the MR\u0027s refcount upon association."
        }
      ],
      "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 trigger is a local IB_USER_VERBS_CMD_DEREG_MR write (ib_uverbs_dereg_mr / UVERBS_METHOD_MR_DESTROY) on /dev/infiniband/uverbs*. After irdma_get_pbl binds an IRDMA_MEMREG_TYPE_QP/CQ/SRQ ring MR to a live QP/CQ/SRQ, irdma_dereg_mr still frees it; no iWARP/RoCE message supplies that deregistration.\nAC:L - The attacker drives every step with no race: irdma_reg_user_mr with reg_type QP/CQ/SRQ, then irdma_setup_umode_qp/irdma_create_cq/irdma_setup_umode_srq so irdma_get_pbl sets on_list=false, then irdma_dereg_mr. Pre-fix irdma_del_memlist is a no-op on an already-associated ring, so the free is deterministic.\nPR:L - ib_uverbs_open() only checks rdma_dev_access_netns() (devices shared across netns by default) and ib_uverbs_dereg_mr() only requires ownership of the caller\u0027s MR uobject, with no capability gate. rdma-core udev rules expose uverbs as 0666; a small ring fits unprivileged RLIMIT_MEMLOCK without CAP_IPC_LOCK.\nUI:N - The attacker registers the ring MR via ib_uverbs_reg_mr, creates the QP/CQ/SRQ, and issues IB_USER_VERBS_CMD_DEREG_MR on that handle from their own process; no other user must mount a device, open a file, or otherwise act.\nS:U - irdma_dereg_mr kfree()s the irdma_mr and releases its umem/HMC PBLEs while the same host\u0027s QP/CQ/SRQ still holds iwpbl and the NIC still DMAs those rings. That is host-kernel memory corruption, not a KVM/Xen guest-to-host escape or an IOMMU isolation bypass.\nC:H - irdma_dereg_mr calls ib_umem_release, irdma_free_pble, and kfree(iwmr) while hardware still walks those HMC PBLEs and DMA-reads SQ/RQ/CQ rings. Recycled umem pages and PBLE tables yield device DMA reads of kernel or other-process memory, and iwqp/iwcq-\u003eiwpbl dangles into the freed irdma_mr.\nI:H - The NIC keeps DMAing CQEs/WQEs into unpinned, reallocatable ring pages and walking freed PBLE page tables, producing device writes into recycled kernel memory. Combined with the irdma_mr heap UAF (struct irdma_pbl iwpbl is embedded in iwmr), this is an arbitrary-write primitive.\nA:H - kfree of a still-referenced irdma_mr, irdma_free_pble of live HMC page tables, and DMA into unmapped SQ/RQ/CQ pages cause a kernel oops/panic or an irdma CQP/device reset when the QP/CQ/SRQ is next used or destroyed."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:56:16.837Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/07974c267f603a76aead348bca97deee95efdcc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f67d8a08f60c9217df6d40da56422d2049f5e334"
        }
      ],
      "title": "RDMA/irdma: Add refcounting to user ring MRs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93154",
    "datePublished": "2026-09-17T16:11:50.107Z",
    "dateReserved": "2026-09-17T16:02:15.089Z",
    "dateUpdated": "2026-09-18T17:56:16.837Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-93154",
      "date": "2026-09-29",
      "epss": "0.00173",
      "percentile": "0.06034"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/infiniband/hw/irdma/utils.c",
                  "drivers/infiniband/hw/irdma/verbs.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
                  },
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                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "versionType": "git"
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                ],
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                "vendor": "Linux",
                "versions": [
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                    "version": "5.14"
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                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "6.18.52",
                    "versionType": "semver"
                  },
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                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
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                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Add refcounting to user ring MRs\n\nPrevent userspace from deregistering the MRs that back QP/CQ/SRQ rings\nby bumping the MR\u0027s refcount upon association."
          }
        ],
        "id": "CVE-2026-93154",
        "lastModified": "2026-09-18T18:18:23.060",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-17T17:18:10.710",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/07974c267f603a76aead348bca97deee95efdcc9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a6c0e693a7c881bfa43ac74cbcad1f8e10f1382b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f67d8a08f60c9217df6d40da56422d2049f5e334"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.