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CVE-2026-72494 (GCVE-0-2026-72494)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
Title
RDMA/irdma: Replace waitqueue and flag with completion
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Replace waitqueue and flag with completion The driver previously used a waitqueue along with an explicit request_done flag, but without proper barriers around request_done. An earlier patch by Gui-Dong Han <hanguidong02@gmail.com> attempted to fix this by adding the missing memory barriers. Rather than adding the barriers, this patch replaces the waitqueue+flag with a completion, which is designed for this exact purpose.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 44d9e52977a1b90b0db1c7f8b197c218e9226520 , < bde37aed0724c0139dea177f3aae8d989b6babb1 (git)
Affected: 44d9e52977a1b90b0db1c7f8b197c218e9226520 , < d9c8c45e6d2f438a3c8e643ae78b59454fa0fadd (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/irdma/hw.c",
            "drivers/infiniband/hw/irdma/main.h",
            "drivers/infiniband/hw/irdma/utils.c"
          ],
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Replace waitqueue and flag with completion\n\nThe driver previously used a waitqueue along with an explicit\nrequest_done flag, but without proper barriers around request_done.\n\nAn earlier patch by Gui-Dong Han \u003changuidong02@gmail.com\u003e attempted\nto fix this by adding the missing memory barriers. Rather than\nadding the barriers, this patch replaces the waitqueue+flag with\na completion, which is designed for this exact purpose."
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - Intel irdma CQP completion/wait synchronization is exercised from remote iWARP/RoCE connection management (SYN/listener/IEQ/AEQ) and deferred-completion events, not only local ibverbs; network peers drive the completion side of the race on internet-facing RDMA/NFS/SMB-Direct servers.\nAC:L - Attacker controls both sides by flooding concurrent connections/CQP ops remotely or via concurrent RDMA verbs locally; missing release/acquire ordering on request_done vs compl_info is triggerable at high operation rates without luck-dependent layout.\nPR:N - Remote CM and packet-processing paths issue/wait on CQP before MPA/application auth; local exploitation needs only standard unprivileged /dev/infiniband/uverbs* access (0666 under typical rdma-core udev rules), not init-namespace capabilities.\nUI:N - Exploitation needs only attacker-driven network or verbs traffic against an already-bound RDMA device/listener; no additional victim user action at attack time beyond normal server role.\nS:U - Impact stays within kernel/driver security domain (CQP request objects, NIC PF reset); no VM escape or cross-authority boundary.\nC:H - Without proper barriers the waiter can observe request_done before compl_info stores, return success with stale op_ret_val/error, and recycle the cqp_request while hardware still references scratch \u2192 UAF/read primitives.\nI:H - Premature recycle/double-put of dynamic cqp_requests enables attacker-influenced heap reuse; stale callbacks on reused objects and invalid kfree paths provide kernel write/control-flow corruption primitives.\nA:H - Lost request_done causes CQP timeout \u2192 ice_rdma_request_reset PF reset; wrong completion state can leave mod_qp_waitq in uninterruptible wait; UAF/panic paths cause kernel crash/hang."
            }
          ]
        }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/bde37aed0724c0139dea177f3aae8d989b6babb1"
        },
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          "url": "https://git.kernel.org/stable/c/d9c8c45e6d2f438a3c8e643ae78b59454fa0fadd"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72494",
    "datePublished": "2026-08-15T05:57:28.280Z",
    "dateReserved": "2026-08-09T03:40:39.937Z",
    "dateUpdated": "2026-08-17T05:44:55.551Z",
    "state": "PUBLISHED"
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      "date": "2026-09-03",
      "epss": "0.00407",
      "percentile": "0.33918"
    },
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      "product_status:known_not_affected": "1",
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      "title": "RDMA/irdma: Replace waitqueue and flag with completion",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-72494.json",
      "version": "1"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T10:42:42+00:00",
      "cve": "CVE-2026-72494",
      "id": "CVE-2026-72494",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/irdma: Replace waitqueue and flag with completion",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72494.json",
      "version": "3"
    }
  }
}



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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.
  • 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.


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