CVE-2026-74584 (GCVE-0-2026-74584)

Vulnerability from cvelistv5 – Published: 2026-08-22 14:28 – Updated: 2026-08-25 05:40
VLAI
Title
RDMA/bnxt_re: zero shared page before exposing to userspace
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: zero shared page before exposing to userspace bnxt_re_alloc_ucontext() allocates uctx->shpg via __get_free_page(GFP_KERNEL). The buddy allocator does not zero pages without __GFP_ZERO, so the page contains stale kernel data from whatever object most recently freed it. The page is then mapped into userspace via vm_insert_page() under BNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes 4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside bnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed to userspace unsanitised, leaking kernel memory contents. Any user with access to /dev/infiniband/uverbsX on a host with a bnxt_re device (typically rdma group membership) can read this data via a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT. Other shared pages in the same file already use get_zeroed_page() correctly: drivers/infiniband/hw/bnxt_re/ib_verbs.c srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL); cq->uctx_cq_page = (void *)get_zeroed_page(GFP_KERNEL); uctx->shpg is the only outlier. Bring it in line with the existing convention by switching to get_zeroed_page().
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < 53c97e9882f4e747b4ac31b211317c2eba541af9 (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < 9896bdfd21d918e9f26a52bc6109cc77970ee0b1 (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < 9128c2411b83a64c0a69d2ff059c741bde25a9cc (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < c19b360fa10c521c0b681875cdaa51545d45a491 (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1 (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < e2b143df29003d2704b51f62e9297006953dbacb (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a (git)
Affected: 1ac5a404797523cedaf424a3aaa3cf8f9548dff8 , < f6b079629becfa977f9c51fe53ad2e6dcc55ef44 (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.37 , ≤ 6.18.* (semver)
Unaffected: 7.0.14 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: zero shared page before exposing to userspace\n\nbnxt_re_alloc_ucontext() allocates uctx-\u003eshpg via\n__get_free_page(GFP_KERNEL). The buddy allocator does not zero pages\nwithout __GFP_ZERO, so the page contains stale kernel data from\nwhatever object most recently freed it.\n\nThe page is then mapped into userspace via vm_insert_page() under\nBNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes\n4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside\nbnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed\nto userspace unsanitised, leaking kernel memory contents.\n\nAny user with access to /dev/infiniband/uverbsX on a host with a\nbnxt_re device (typically rdma group membership) can read this data\nvia a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT.\n\nOther shared pages in the same file already use get_zeroed_page()\ncorrectly:\n\n  drivers/infiniband/hw/bnxt_re/ib_verbs.c\n      srq-\u003euctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL);\n      cq-\u003euctx_cq_page  = (void *)get_zeroed_page(GFP_KERNEL);\n\nuctx-\u003eshpg is the only outlier. Bring it in line with the existing\nconvention by switching to get_zeroed_page()."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The leak is triggered only through local access to /dev/infiniband/uverbs* via ioctl GET_CONTEXT and mmap(pgoff 0); bnxt_re_mmap maps the shared page with vm_insert_page, and remote RoCE/IB packet handling never reaches this uverbs allocation path.\nAC:L - On a host with bnxt_re loaded, opening uverbs, issuing GET_CONTEXT, and mmap at offset 0 deterministically exposes the unstale page; the attacker controls all syscall parameters and needs no race, special memory layout, or victim-specific state.\nPR:N - Kernel uverbs character devices are created world-accessible (mode 0666) via uverbs_devnode, and ib_uverbs_open performs no capability or root check beyond netns access, so any local process can open the device and allocate a bnxt_re ucontext.\nUI:N - Exploitation requires only attacker-driven open/ioctl/mmap/read syscalls on their own uverbs file descriptor; no cooperative victim action such as mounting filesystems, opening files, or clicking links is needed.\nS:C - On HPC/cloud hosts exposing bnxt_re to tenant containers or shared RDMA workloads, mmap of unstale host-kernel buddy pages leaks host kernel memory across the container/tenant security boundary into an unprivileged workload\u0027s address space.\nC:H - __get_free_page without __GFP_ZERO leaves up to 4092 bytes of stale kernel heap/slack data readable per ucontext; repeated opens yield additional pages, disclosing kernel pointers, structures, and other sensitive material beyond a few-byte bounded leak.\nI:N - The flaw only exposes existing kernel memory contents to userspace via mmap; it does not corrupt, overwrite, or modify kernel objects, grant write primitives, or enable code execution through the shared page mapping.\nA:N - Reading the unstale mapped page does not trigger kernel oops, panic, hang, or resource exhaustion; the vulnerable path completes normally and availability is unaffected aside from normal per-context page allocation."
            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:11.315Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/9896bdfd21d918e9f26a52bc6109cc77970ee0b1"
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          "url": "https://git.kernel.org/stable/c/c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6b079629becfa977f9c51fe53ad2e6dcc55ef44"
        }
      ],
      "title": "RDMA/bnxt_re: zero shared page before exposing to userspace",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74584",
    "datePublished": "2026-08-22T14:28:07.988Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:11.315Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.03088"
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                    "versionType": "semver"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: zero shared page before exposing to userspace\n\nbnxt_re_alloc_ucontext() allocates uctx-\u003eshpg via\n__get_free_page(GFP_KERNEL). The buddy allocator does not zero pages\nwithout __GFP_ZERO, so the page contains stale kernel data from\nwhatever object most recently freed it.\n\nThe page is then mapped into userspace via vm_insert_page() under\nBNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes\n4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside\nbnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed\nto userspace unsanitised, leaking kernel memory contents.\n\nAny user with access to /dev/infiniband/uverbsX on a host with a\nbnxt_re device (typically rdma group membership) can read this data\nvia a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT.\n\nOther shared pages in the same file already use get_zeroed_page()\ncorrectly:\n\n  drivers/infiniband/hw/bnxt_re/ib_verbs.c\n      srq-\u003euctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL);\n      cq-\u003euctx_cq_page  = (void *)get_zeroed_page(GFP_KERNEL);\n\nuctx-\u003eshpg is the only outlier. Bring it in line with the existing\nconvention by switching to get_zeroed_page()."
          }
        ],
        "id": "CVE-2026-74584",
        "lastModified": "2026-08-25T06:18:32.357",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 4.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-22T15:16:21.230",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/53c97e9882f4e747b4ac31b211317c2eba541af9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9128c2411b83a64c0a69d2ff059c741bde25a9cc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9896bdfd21d918e9f26a52bc6109cc77970ee0b1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c19b360fa10c521c0b681875cdaa51545d45a491"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e2b143df29003d2704b51f62e9297006953dbacb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f6b079629becfa977f9c51fe53ad2e6dcc55ef44"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:49:23+00:00",
      "cve": "CVE-2026-74584",
      "id": "CVE-2026-74584",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/bnxt_re: zero shared page before exposing to userspace",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74584.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:26:15Z",
      "cve": "CVE-2026-74584",
      "id": "CVE-2026-74584",
      "initial_release_date": "2026-08-27T16:51:19Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "710",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74584",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74584.json",
      "version": "9"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.