Vulnerability-Lookup

GHSA-F5GM-G4V9-MV95

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32

Details

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

RDMA/siw: publish QP after initialization

siw_create_qp() currently calls siw_qp_add() before the queues, CQ pointers, state, completion, and device list entry are ready. A QPN lookup can therefore reach a QP that is still being constructed.

Move siw_qp_add() to the end of siw_create_qp(), after QP initialization and before adding the QP to the siw device list.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68417"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:35Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: publish QP after initialization\n\nsiw_create_qp() currently calls siw_qp_add() before the queues, CQ\npointers, state, completion, and device list entry are ready. A QPN\nlookup can therefore reach a QP that is still being constructed.\n\nMove siw_qp_add() to the end of siw_create_qp(), after QP\ninitialization and before adding the QP to the siw device list.",
  "id": "GHSA-f5gm-g4v9-mv95",
  "modified": "2026-08-19T18:32:19Z",
  "published": "2026-08-10T15:33:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68417"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36e91a58397ca8c978e38a0bf389f0c6113fa8ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c9d128219964dcea897bf6139b88242e987be8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ff82e3841ecab1ff38d5817c969a019d266c83c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52f9fcb191143448df55fd215ff09c5207fed43e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74912ad168f87d6b2b670a87987bb302d6e64aa1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb27fcc67c429d97f785c92c35a6c5adebb05d7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68417 (GCVE-0-2026-68417)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-19 16:35

Title

RDMA/siw: publish QP after initialization

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: publish QP after initialization siw_create_qp() currently calls siw_qp_add() before the queues, CQ pointers, state, completion, and device list entry are ready. A QPN lookup can therefore reach a QP that is still being constructed. Move siw_qp_add() to the end of siw_create_qp(), after QP initialization and before adding the QP to the siw device list.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/3c9d128219964dcea…
https://git.kernel.org/stable/c/3ff82e3841ecab1ff…
https://git.kernel.org/stable/c/36e91a58397ca8c97…
https://git.kernel.org/stable/c/74912ad168f87d6b2…
https://git.kernel.org/stable/c/fcc9d50022bcdb1f9…
https://git.kernel.org/stable/c/52f9fcb191143448d…
https://git.kernel.org/stable/c/bb27fcc67c429d97f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 3c9d128219964dcea897bf6139b88242e987be8f (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 3ff82e3841ecab1ff38d5817c969a019d266c83c (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 36e91a58397ca8c978e38a0bf389f0c6113fa8ca (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 74912ad168f87d6b2b670a87987bb302d6e64aa1 (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 52f9fcb191143448df55fd215ff09c5207fed43e (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < bb27fcc67c429d97f785c92c35a6c5adebb05d7f (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3c9d128219964dcea897bf6139b88242e987be8f",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            },
            {
              "lessThan": "3ff82e3841ecab1ff38d5817c969a019d266c83c",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            },
            {
              "lessThan": "36e91a58397ca8c978e38a0bf389f0c6113fa8ca",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            },
            {
              "lessThan": "74912ad168f87d6b2b670a87987bb302d6e64aa1",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            },
            {
              "lessThan": "fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            },
            {
              "lessThan": "52f9fcb191143448df55fd215ff09c5207fed43e",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            },
            {
              "lessThan": "bb27fcc67c429d97f785c92c35a6c5adebb05d7f",
              "status": "affected",
              "version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: publish QP after initialization\n\nsiw_create_qp() currently calls siw_qp_add() before the queues, CQ\npointers, state, completion, and device list entry are ready. A QPN\nlookup can therefore reach a QP that is still being constructed.\n\nMove siw_qp_add() to the end of siw_create_qp(), after QP\ninitialization and before adding the QP to the siw device list."
        }
      ],
      "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 - Exploitation requires local access to the RDMA character devices (/dev/infiniband/uverbsN for create_qp and /dev/infiniband/rdma_cm for the QPN lookup); no network packet reaches the racing code path without a local trigger first.\nAC:L - The attacker controls both sides of the race: one thread issues create_qp while another issues rdma_connect/rdma_accept with an attacker-supplied qp_num, and QPNs from xa_alloc(XA_FLAGS_ALLOC1) are predictable. The post-publish failure can be made deterministic by passing a short udata-\u003eoutlen, so the window is wide and repeatable at will.\nPR:L - Any unprivileged local user with access to the siw uverbs and rdma_cm character devices can create QPs and issue rdma_connect/rdma_accept with an arbitrary qp_num; no capability check gates siw_create_qp, siw_connect or siw_accept.\nUI:N - The attacker drives both the QP creation and the concurrent QPN lookup from its own threads; no action by any other user or administrator is needed.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no crossing of a VM, IOMMU or sandbox boundary.\nC:H - The siw_qp object can be kfree\u0027d by the ib core error path while the CM thread still holds a reference, giving a use-after-free on a slab object the attacker can groom and read back through QP/CM state, enabling disclosure of arbitrary kernel memory.\nI:H - After the free, siw_free_qp() performs list_del(\u0026qp-\u003edevq), vfree() of four pointer fields and siw_put_tx_cpu(qp-\u003etx_cpu) using values read from reallocated attacker-controlled memory, yielding arbitrary-pointer free, list-unlink writes and out-of-range per-CPU decrements suitable for control-flow hijacking.\nA:H - Even without exploitation the race reliably causes kernel crashes: NULL sendq/recvq/scq/rcq dereferences, list_del on an uninitialized devq head, waits on an uninitialized qp_free completion, and use-after-free oopses."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:35:15.087Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c9d128219964dcea897bf6139b88242e987be8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ff82e3841ecab1ff38d5817c969a019d266c83c"
        },
        {
          "url": "https://git.kernel.org/stable/c/36e91a58397ca8c978e38a0bf389f0c6113fa8ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/74912ad168f87d6b2b670a87987bb302d6e64aa1"
        },
        {
          "url": "https://git.kernel.org/stable/c/fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/52f9fcb191143448df55fd215ff09c5207fed43e"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb27fcc67c429d97f785c92c35a6c5adebb05d7f"
        }
      ],
      "title": "RDMA/siw: publish QP after initialization",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68417",
    "datePublished": "2026-08-10T12:04:37.936Z",
    "dateReserved": "2026-07-30T09:28:09.391Z",
    "dateUpdated": "2026-08-19T16:35:15.087Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-F5GM-G4V9-MV95

CVE-2026-68417 (GCVE-0-2026-68417)

Tags

Sightings

Nomenclature