CVE-2026-72495 (GCVE-0-2026-72495)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
Title
RDMA/bnxt_re: Avoid repeated requests to allocate WC pages
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: Avoid repeated requests to allocate WC pages Applications can request multiple WC pages for the same ucontext. As of now, only 1 WC page per ucontext is supported. Add a lock to avoid concurrent access and a check to fail repeated requests. Also, if the mmap entry insert fails for the WC, free the Doorbell page index mapped for the WC page.
Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 360da60d6c6edb9740de7a8e6d8969d62ceff956 , < 478c4d24193fe3e6aa2accd4874ae43000e4a217 (git)
Affected: 360da60d6c6edb9740de7a8e6d8969d62ceff956 , < da406b8b49c1dfe661a497483940d7ee781430db (git)
Affected: 360da60d6c6edb9740de7a8e6d8969d62ceff956 , < 441baa79043431807115fd030d7d0bb14ed441a0 (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (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",
            "drivers/infiniband/hw/bnxt_re/ib_verbs.h",
            "drivers/infiniband/hw/bnxt_re/uapi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            "drivers/infiniband/hw/bnxt_re/ib_verbs.c",
            "drivers/infiniband/hw/bnxt_re/ib_verbs.h",
            "drivers/infiniband/hw/bnxt_re/uapi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.5"
            },
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              "versionType": "semver"
            },
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
            }
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        }
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              "cpeMatch": [
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                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.5",
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                },
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                  "versionStartIncluding": "6.5",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Avoid repeated requests to allocate WC pages\n\nApplications can request multiple WC pages for the same ucontext.\nAs of now, only 1 WC page per ucontext is supported. Add a lock to\navoid concurrent access and a check to fail repeated requests.\nAlso, if the mmap entry insert fails for the WC, free the Doorbell\npage index mapped for the WC page."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in BNXT_RE_METHOD_ALLOC_PAGE, reached only via write/ioctl on /dev/infiniband/uverbs* after IB ucontext creation; remote RoCE packet handling and in-kernel RDMA target/server paths never invoke this WC DPI allocation routine.\nAC:L - An attacker can deterministically trigger the bug by issuing repeated or concurrent BNXT_RE_ALLOC_WC_PAGE calls from multiple threads on the same ucontext; they control both sides of the race and need no uncontrollable memory layout or victim-specific state.\nPR:N - Standard uverbs character devices are created mode 0666, so any local process can open the bnxt_re device, allocate a ucontext, and invoke BNXT_RE_METHOD_ALLOC_PAGE without CAP_SYS_ADMIN, init-namespace root, or other elevated capabilities.\nUI:N - No victim interaction is required; exploitation needs only the attacker (or a compromised local RDMA workload) repeatedly or concurrently calling ALLOC_PAGE on resources it already controls through normal RDMA verbs.\nS:C - On HPC/cloud hosts exposing bnxt_re to tenant containers or unprivileged RDMA workloads, corrupting shared per-device DPI bookkeeping or exhausting finite doorbell indices crosses the container/tenant boundary to impact the host/kernel security authority.\nC:H - Without serialization or duplicate checks, corrupt DPI index bookkeeping and premature slot reuse can alias WC doorbell BAR pages across contexts, exposing other users\u0027 doorbell state and providing resource-corruption primitives usable for information disclosure.\nI:H - Destroying one ALLOC_PAGE object can deallocate another object\u0027s live WC DPI slot while its BAR mmap remains active, letting a later allocation share the same doorbell page and enabling cross-context WC doorbell writes that corrupt other tenants\u0027 RDMA queue signaling.\nA:H - Each orphaned DPI entry permanently consumes a finite per-device doorbell index (exhaustible via repeated or concurrent ALLOC_PAGE), denying RDMA service cluster-wide; unsynchronized wcdpi updates can also destabilize kernel DPI teardown paths."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:56.649Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/478c4d24193fe3e6aa2accd4874ae43000e4a217"
        },
        {
          "url": "https://git.kernel.org/stable/c/da406b8b49c1dfe661a497483940d7ee781430db"
        },
        {
          "url": "https://git.kernel.org/stable/c/441baa79043431807115fd030d7d0bb14ed441a0"
        }
      ],
      "title": "RDMA/bnxt_re: Avoid repeated requests to allocate WC pages",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72495",
    "datePublished": "2026-08-15T05:57:28.920Z",
    "dateReserved": "2026-08-09T03:40:39.937Z",
    "dateUpdated": "2026-08-17T05:44:56.649Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-08-17",
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      "percentile": "0.07635"
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  }
}



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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

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.