CVE-2026-68418 (GCVE-0-2026-68418)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:05
VLAI
Title
RDMA/irdma: Prevent user-triggered null deref on QP create
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent user-triggered null deref on QP create Previously, the user QP creation path would only attempt to populate iwqp->iwpbl if the user-provided req.user_wqe_bufs field was non-zero. The problem is that iwqp->iwpbl is unconditionally dereferenced later on in irdma_setup_virt_qp. While there was a check for iwqp->iwpbl != NULL, this check would only occur if req.user_wqe_bufs was non-zero. The end result is that a user could send a zero user_wqe_bufs value and trigger a null ptr deref. Fix this by unconditionally calling irdma_get_pbl and bailing if it fails, similar to the CQ and SRQ paths.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < ec675b4cdfd378d8c9dd8c93126c024f2469bd79 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < 728211c815f6eef28dd3df2a5b6297483185aa20 (git)
Affected: b48c24c2d710cf34810c555dcef883a3d35a9c08 , < b9b0889071569d43623c260074e159cd8f26adb1 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (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/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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          "vendor": "Linux",
          "versions": [
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      "cpeApplicability": [
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          "nodes": [
            {
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Prevent user-triggered null deref on QP create\n\nPreviously, the user QP creation path would only attempt to\npopulate iwqp-\u003eiwpbl if the user-provided req.user_wqe_bufs\nfield was non-zero. The problem is that iwqp-\u003eiwpbl is\nunconditionally dereferenced later on in irdma_setup_virt_qp.\n\nWhile there was a check for iwqp-\u003eiwpbl != NULL, this check\nwould only occur if req.user_wqe_bufs was non-zero. The end\nresult is that a user could send a zero user_wqe_bufs value\nand trigger a null ptr deref.\n\nFix this by unconditionally calling irdma_get_pbl and bailing\nif it fails, similar to the CQ and SRQ paths."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:05:13.218Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/ec675b4cdfd378d8c9dd8c93126c024f2469bd79"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/b9b0889071569d43623c260074e159cd8f26adb1"
        }
      ],
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68418",
    "datePublished": "2026-08-10T12:04:38.930Z",
    "dateReserved": "2026-07-30T09:28:09.391Z",
    "dateUpdated": "2026-08-17T05:05:13.218Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-20",
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      "percentile": "0.05015"
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      "cve": "CVE-2026-68418",
      "id": "msrc_CVE-2026-68418",
      "initial_release_date": "2026-08-11T01:14:41.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RDMA/irdma: Prevent user-triggered null deref on QP create",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-68418.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/infiniband/hw/irdma/verbs.c"
                ],
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              {
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                  },
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                  }
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Prevent user-triggered null deref on QP create\n\nPreviously, the user QP creation path would only attempt to\npopulate iwqp-\u003eiwpbl if the user-provided req.user_wqe_bufs\nfield was non-zero. The problem is that iwqp-\u003eiwpbl is\nunconditionally dereferenced later on in irdma_setup_virt_qp.\n\nWhile there was a check for iwqp-\u003eiwpbl != NULL, this check\nwould only occur if req.user_wqe_bufs was non-zero. The end\nresult is that a user could send a zero user_wqe_bufs value\nand trigger a null ptr deref.\n\nFix this by unconditionally calling irdma_get_pbl and bailing\nif it fails, similar to the CQ and SRQ paths."
          }
        ],
        "id": "CVE-2026-68418",
        "lastModified": "2026-08-17T06:17:50.810",
        "metrics": {},
        "published": "2026-08-10T13:20:35.623",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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      "current_release_date": "2026-08-31T11:45:36+00:00",
      "cve": "CVE-2026-68418",
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      "product_status:known_affected": "233",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: RDMA/irdma: Prevent user-triggered null deref on QP create",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68418.json",
      "version": "3"
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-68418",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68418.json",
      "version": "9"
    }
  }
}



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  • 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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