CVE-2026-72499 (GCVE-0-2026-72499)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
Title
RDMA/bnxt_re: Free CQ toggle page after firmware teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: Free CQ toggle page after firmware teardown Free the toggle page only after firmware teardown completes so that an NQ interrupt arriving during bnxt_qplib_destroy_cq() won't write the toggle value to an already-freed page. Move free_page() after bnxt_qplib_destroy_cq.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e275919d96693c5ca964b20d73a33d52a7e57f04 , < b193854675ecad43b4d69c304c1b6a90b206cc99 (git)
Affected: e275919d96693c5ca964b20d73a33d52a7e57f04 , < bb45e06f9914ca64ac95341a80a0c20bb8dd46a9 (git)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 7.1.5 , ≤ 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/bnxt_re/ib_verbs.c"
          ],
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              "versionType": "git"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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                  "vulnerable": true
                },
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Free CQ toggle page after firmware teardown\n\nFree the toggle page only after firmware teardown completes so that\nan NQ interrupt arriving during bnxt_qplib_destroy_cq() won\u0027t write\nthe toggle value to an already-freed page. Move free_page() after\nbnxt_qplib_destroy_cq."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is triggered by destroying a user CQ through the RDMA uverbs ioctl on /dev/infiniband/uverbs*; although RoCE peers can generate CQ/NQ events, the premature free_page() only occurs in this local destroy path, not from remote packet handling alone.\nAC:L - An attacker controls CQ teardown timing via ibv_destroy_cq and can reliably create the race by keeping QPs active and/or soliciting CQ notifications (including from a cooperating RoCE peer) while destroy_cq runs through bnxt_qplib_destroy_cq firmware teardown.\nPR:L - Exploitation requires only local RDMA verbs access to create/destroy a user CQ on a Gen P7 bnxt_re device; uverbs char devices are created world-accessible (0666) and RDMA is commonly granted to unprivileged HPC/cloud/Kubernetes workload users rather than real root.\nUI:N - No victim interaction is required beyond the attacker (or compromised local workload) invoking CQ destroy on resources it already controls; remote peers may assist timing but do not need the victim to click, mount, or open files.\nS:C - On Kubernetes/HPC hosts that expose bnxt_re to containers/pods, triggering this host-kernel UAF from an unprivileged RDMA-enabled workload can corrupt host memory and enable container-to-host sandbox escape beyond the workload security boundary.\nC:H - This is a kernel write-after-free: an NQ interrupt writes a toggle value into a page already returned to the buddy allocator, enabling corruption of subsequently reallocated kernel objects and classic UAF-based information disclosure primitives.\nI:H - The interrupt path performs a controlled 4-byte write to freed kernel memory during destroy_cq, providing a heap corruption primitive that can be developed into arbitrary kernel write or code execution rather than being limited to a benign crash.\nA:H - Writing to a freed page during interrupt handling can oops/panic the kernel immediately, and repeated CQ create/destroy cycles let an attacker reliably induce host-level denial of service on RDMA-enabled systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:59.920Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b193854675ecad43b4d69c304c1b6a90b206cc99"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb45e06f9914ca64ac95341a80a0c20bb8dd46a9"
        }
      ],
      "title": "RDMA/bnxt_re: Free CQ toggle page after firmware teardown",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72499",
    "datePublished": "2026-08-15T05:57:31.696Z",
    "dateReserved": "2026-08-09T03:40:39.937Z",
    "dateUpdated": "2026-08-17T05:44:59.920Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72499",
      "date": "2026-08-22",
      "epss": "0.0012",
      "percentile": "0.02194"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T19:39:09+00:00",
      "cve": "CVE-2026-72499",
      "id": "CVE-2026-72499",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/bnxt_re: Free CQ toggle page after firmware teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72499.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.


Detection rules are retrieved from Rulezet.