CVE-2026-90308 (GCVE-0-2026-90308)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-18 17:54
VLAI
Title
RDMA/erdma: Hold QP references for AE and CM processing
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold QP references for AE and CM processing AE QP fatal events and iWARP CM paths load QPs from dev->qp_xa and then use or reference them outside the xarray lock. erdma_destroy_qp() can drop the destroy-path reference and free QP resources while such a lookup is in flight. Add erdma_qp_get_by_qpn() to acquire a kref under the xarray lock with kref_get_unless_zero(). Remove the QP from the xarray before dropping the destroy-path reference so no new lookup can acquire it while destruction waits for existing users.
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: 155055771704f8cbb5c176a4309b7dc30a50450c , < 6e32f84b63c054e09392153125d7202abab2d14b (git)
Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < ec987c0654651036dad6a42f7fa2a6d7c16a3687 (git)
Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < c92686867638cda954fdb2bdbac8a75e3aa6eaae (git)
Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < a52eeff32024f190b3bdc99088c7becccd4fa60b (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_cm.c",
            "drivers/infiniband/hw/erdma/erdma_eq.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6e32f84b63c054e09392153125d7202abab2d14b",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "ec987c0654651036dad6a42f7fa2a6d7c16a3687",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "c92686867638cda954fdb2bdbac8a75e3aa6eaae",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "a52eeff32024f190b3bdc99088c7becccd4fa60b",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_cm.c",
            "drivers/infiniband/hw/erdma/erdma_eq.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "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": "6.12.110",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold QP references for AE and CM processing\n\nAE QP fatal events and iWARP CM paths load QPs from dev-\u003eqp_xa\nand then use or reference them outside the xarray lock.\nerdma_destroy_qp() can drop the destroy-path reference and free QP\nresources while such a lookup is in flight.\n\nAdd erdma_qp_get_by_qpn() to acquire a kref under the xarray\nlock with kref_get_unless_zero(). Remove the QP from the xarray\nbefore dropping the destroy-path reference so no new lookup can acquire\nit while destruction waits for existing users."
        }
      ],
      "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 UAF is a race between local ib_uverbs_destroy_qp()-\u003eerdma_destroy_qp() dropping the QP kref and either ucma_connect()/ucma_accept() (RDMA_USER_CM_CONNECT/ACCEPT -\u003e iw_cm_connect()/iw_cm_accept() -\u003e erdma_connect()/erdma_accept() xa_load of userspace params-\u003eqpn) or erdma_comm_irq_handler()-\u003eerdma_aeq_event_handler(). The CM QPN is rdma_ucm_conn_param.qp_num, not a remote iWARP/RoCE field.\nAC:L - The attacker who created the QP drives both sides: one thread issues ucma_connect()/ucma_accept() or QP ops that produce an AEQE, while another calls ib_uverbs_destroy_qp(), racing find_qp_by_qpn()/xa_load against the destroy-path erdma_qp_put(). The window (bare xa_load, then kref_get or no get at all) can be retried across many QPs.\nPR:L - ib_uverbs_open() and ucma_open() perform no capability check; uverbs_devnode() and ucma_misc.mode publish /dev/infiniband/uverbs* and /dev/infiniband/rdma_cm as 0666, so an unprivileged user on an ERDMA host can create_qp, RDMA_USER_CM_CONNECT/ACCEPT, and destroy_qp.\nUI:N - The attacker creates the QP via uverbs, issues ucma_connect()/ucma_accept() (or generates an AEQE) and ib_uverbs_destroy_qp() from their own processes; no other user must mount, open, or otherwise act.\nS:U - The use-after-free is of the host kernel\u0027s struct erdma_qp (kref, ibqp.event_handler, queue buffers) under the same kernel authority and does not cross a VM, IOMMU, or guest-host boundary.\nC:H - After erdma_destroy_qp() drops the last kref and the RDMA core frees the QP, erdma_aeq_event_handler() still reads qp-\u003eibqp.event_handler and qp_context from the freed object, and erdma_connect() may kref_get a freed QP; a sprayed replacement yields a kernel-memory read primitive.\nI:H - erdma_aeq_event_handler() invokes qp-\u003eibqp.event_handler on the freed erdma_qp, and erdma_connect()/erdma_accept() write qp-\u003ecep and take qp-\u003estate_lock after a lockless xa_load; reclaiming that object gives a function-pointer call and kernel writes.\nA:H - Using the QP after erdma_qp_put()/wait_for_completion() has released its queues and the ib_qp object causes a kernel oops or panic in erdma_aeq_event_handler() or in erdma_connect()/erdma_accept()."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:54:27.165Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6e32f84b63c054e09392153125d7202abab2d14b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec987c0654651036dad6a42f7fa2a6d7c16a3687"
        },
        {
          "url": "https://git.kernel.org/stable/c/c92686867638cda954fdb2bdbac8a75e3aa6eaae"
        },
        {
          "url": "https://git.kernel.org/stable/c/a52eeff32024f190b3bdc99088c7becccd4fa60b"
        }
      ],
      "title": "RDMA/erdma: Hold QP references for AE and CM processing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90308",
    "datePublished": "2026-09-17T16:08:29.704Z",
    "dateReserved": "2026-09-11T19:38:34.800Z",
    "dateUpdated": "2026-09-18T17:54:27.165Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-90308",
      "date": "2026-09-25",
      "epss": "0.00175",
      "percentile": "0.06207"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-24T02:26:06.000Z",
      "cve": "CVE-2026-90308",
      "id": "msrc_CVE-2026-90308",
      "initial_release_date": "2026-09-19T01:15:25.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RDMA/erdma: Hold QP references for AE and CM processing",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90308.json",
      "version": "4"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/infiniband/hw/erdma/erdma_cm.c",
                  "drivers/infiniband/hw/erdma/erdma_eq.c",
                  "drivers/infiniband/hw/erdma/erdma_verbs.c",
                  "drivers/infiniband/hw/erdma/erdma_verbs.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "6e32f84b63c054e09392153125d7202abab2d14b",
                    "status": "affected",
                    "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "ec987c0654651036dad6a42f7fa2a6d7c16a3687",
                    "status": "affected",
                    "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c92686867638cda954fdb2bdbac8a75e3aa6eaae",
                    "status": "affected",
                    "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a52eeff32024f190b3bdc99088c7becccd4fa60b",
                    "status": "affected",
                    "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/infiniband/hw/erdma/erdma_cm.c",
                  "drivers/infiniband/hw/erdma/erdma_eq.c",
                  "drivers/infiniband/hw/erdma/erdma_verbs.c",
                  "drivers/infiniband/hw/erdma/erdma_verbs.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.0"
                  },
                  {
                    "lessThan": "6.0",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.52",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "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/erdma: Hold QP references for AE and CM processing\n\nAE QP fatal events and iWARP CM paths load QPs from dev-\u003eqp_xa\nand then use or reference them outside the xarray lock.\nerdma_destroy_qp() can drop the destroy-path reference and free QP\nresources while such a lookup is in flight.\n\nAdd erdma_qp_get_by_qpn() to acquire a kref under the xarray\nlock with kref_get_unless_zero(). Remove the QP from the xarray\nbefore dropping the destroy-path reference so no new lookup can acquire\nit while destruction waits for existing users."
          }
        ],
        "id": "CVE-2026-90308",
        "lastModified": "2026-09-18T18:17:52.833",
        "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:17:28.520",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6e32f84b63c054e09392153125d7202abab2d14b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a52eeff32024f190b3bdc99088c7becccd4fa60b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c92686867638cda954fdb2bdbac8a75e3aa6eaae"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ec987c0654651036dad6a42f7fa2a6d7c16a3687"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.