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GHSA-3P8H-WX5X-6QQ3

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-07 09:32

Details

In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access

mr_check_range() validates that [iova, iova+length) falls within the registered MR range using wraparound-prone arithmetic:

if (iova < mr->ibmr.iova ||
    iova + length > mr->ibmr.iova + mr->ibmr.length)

A remote peer can craft an RDMA-Write/Read RETH so that iova + length wraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the check. rxe_mr_iova_to_index() then computes a huge index (int idx, only guarded by WARN_ON) and rxe_mr_copy_xarray() dereferences mr->page_info[huge], causing an out-of-bounds read/write and a kernel oops that is triggerable by an unauthenticated remote peer.

Rewrite the check in overflow-safe form; the first two clauses guarantee that the subsequent subtractions do not underflow:

if (iova < mr->ibmr.iova ||
    length > mr->ibmr.length ||
    iova - mr->ibmr.iova > mr->ibmr.length - length)

With the fix, mr_check_range() returns -EINVAL for the crafted iova and the responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98365"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:18:30Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access\n\nmr_check_range() validates that [iova, iova+length) falls within the\nregistered MR range using wraparound-prone arithmetic:\n\n    if (iova \u003c mr-\u003eibmr.iova ||\n        iova + length \u003e mr-\u003eibmr.iova + mr-\u003eibmr.length)\n\nA remote peer can craft an RDMA-Write/Read RETH so that iova + length\nwraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the\ncheck. rxe_mr_iova_to_index() then computes a huge index (int idx, only\nguarded by WARN_ON) and rxe_mr_copy_xarray() dereferences\nmr-\u003epage_info[huge], causing an out-of-bounds read/write and a kernel\noops that is triggerable by an unauthenticated remote peer.\n\nRewrite the check in overflow-safe form; the first two clauses guarantee\nthat the subsequent subtractions do not underflow:\n\n    if (iova \u003c mr-\u003eibmr.iova ||\n        length \u003e mr-\u003eibmr.length ||\n        iova - mr-\u003eibmr.iova \u003e mr-\u003eibmr.length - length)\n\nWith the fix, mr_check_range() returns -EINVAL for the crafted iova and\nthe responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.",
  "id": "GHSA-3p8h-wx5x-6qq3",
  "modified": "2026-10-07T09:32:17Z",
  "published": "2026-10-06T09:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98365"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f3b705144e3a3c14184fec6e354680081fe91ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3431f525718f6b07da308cda6d44f8cb548bbd37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d9426a74fc8cb8f375fcdc19b465a030f9b8cab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7d2118660545a00b21e83010ded1a231c6fb8c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d10e2a08799e858d3e71ea4169bcd018f216d444"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-98365 (GCVE-0-2026-98365)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:46 – Updated: 2026-10-07 06:50

Title

RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access mr_check_range() validates that [iova, iova+length) falls within the registered MR range using wraparound-prone arithmetic: if (iova < mr->ibmr.iova || iova + length > mr->ibmr.iova + mr->ibmr.length) A remote peer can craft an RDMA-Write/Read RETH so that iova + length wraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the check. rxe_mr_iova_to_index() then computes a huge index (int idx, only guarded by WARN_ON) and rxe_mr_copy_xarray() dereferences mr->page_info[huge], causing an out-of-bounds read/write and a kernel oops that is triggerable by an unauthenticated remote peer. Rewrite the check in overflow-safe form; the first two clauses guarantee that the subsequent subtractions do not underflow: if (iova < mr->ibmr.iova || length > mr->ibmr.length || iova - mr->ibmr.iova > mr->ibmr.length - length) With the fix, mr_check_range() returns -EINVAL for the crafted iova and the responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

5 references

URL	Tags
https://git.kernel.org/stable/c/b7d2118660545a00b…
https://git.kernel.org/stable/c/5d9426a74fc8cb8f3…
https://git.kernel.org/stable/c/2f3b705144e3a3c14…
https://git.kernel.org/stable/c/3431f525718f6b07d…
https://git.kernel.org/stable/c/d10e2a08799e858d3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < b7d2118660545a00b21e83010ded1a231c6fb8c5 (git) Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 5d9426a74fc8cb8f375fcdc19b465a030f9b8cab (git) Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 2f3b705144e3a3c14184fec6e354680081fe91ec (git) Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 3431f525718f6b07da308cda6d44f8cb548bbd37 (git) Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < d10e2a08799e858d3e71ea4169bcd018f216d444 (git)
Linux	Linux	Affected: 4.8 Unaffected: 0 , < 4.8 (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.54 , ≤ 6.18.* (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b7d2118660545a00b21e83010ded1a231c6fb8c5",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "5d9426a74fc8cb8f375fcdc19b465a030f9b8cab",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "2f3b705144e3a3c14184fec6e354680081fe91ec",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "3431f525718f6b07da308cda6d44f8cb548bbd37",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "d10e2a08799e858d3e71ea4169bcd018f216d444",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access\n\nmr_check_range() validates that [iova, iova+length) falls within the\nregistered MR range using wraparound-prone arithmetic:\n\n    if (iova \u003c mr-\u003eibmr.iova ||\n        iova + length \u003e mr-\u003eibmr.iova + mr-\u003eibmr.length)\n\nA remote peer can craft an RDMA-Write/Read RETH so that iova + length\nwraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the\ncheck. rxe_mr_iova_to_index() then computes a huge index (int idx, only\nguarded by WARN_ON) and rxe_mr_copy_xarray() dereferences\nmr-\u003epage_info[huge], causing an out-of-bounds read/write and a kernel\noops that is triggerable by an unauthenticated remote peer.\n\nRewrite the check in overflow-safe form; the first two clauses guarantee\nthat the subsequent subtractions do not underflow:\n\n    if (iova \u003c mr-\u003eibmr.iova ||\n        length \u003e mr-\u003eibmr.length ||\n        iova - mr-\u003eibmr.iova \u003e mr-\u003eibmr.length - length)\n\nWith the fix, mr_check_range() returns -EINVAL for the crafted iova and\nthe responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bad iova and length come from the RETH header of a RoCEv2 RDMA WRITE/READ (UDP/IP, routable). qp_resp_from_reth() copies them into qp-\u003eresp, and check_rkey() hands them to mr_check_range(), where iova+length wraps past 2^64 and the bounds check passes.\nAC:L - The attacker is the connected RC peer, so it controls the QPN, PSN and RETH contents and chooses va near 2^64 to make iova+length wrap for any MR. The bug fires on the first packet, with no race or memory layout to win.\nPR:N - RoCE has no authentication. check_addr() only matches the peer\u0027s IP address, and services such as rtrs-srv send MR rkeys with IB_ACCESS_REMOTE_WRITE to any client that connects, without checking credentials.\nUI:N - No victim action is needed. The responder processes the attacker\u0027s RETH request entirely in kernel receive context once the QP is connected.\nS:U - The out-of-bounds access corrupts or discloses kernel memory on the same host, inside the kernel\u0027s own security authority. No VM or IOMMU boundary is crossed.\nC:H - For RDMA READ, rxe_mr_copy_xarray() memcpy()s from a struct page pointer read out of bounds of mr-\u003epage_info[], and that data is sent back to the remote peer. Choosing va moves the index over a window of about 2^20 entries.\nI:H - For RDMA WRITE, rxe_mr_copy_xarray() memcpy()s the peer\u0027s payload into the page pointed to by the out-of-bounds page_info[idx].page entry. That is a remote write into kernel-chosen memory, which can be used to hijack control flow.\nA:H - An out-of-bounds page_info index, past the WARN_ON in rxe_mr_iova_to_index(), dereferences garbage page pointers and oopses the kernel. A remote peer can repeat this at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T06:50:18.479Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2f3b705144e3a3c14184fec6e354680081fe91ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/3431f525718f6b07da308cda6d44f8cb548bbd37"
        },
        {
          "url": "https://git.kernel.org/stable/c/d10e2a08799e858d3e71ea4169bcd018f216d444"
        }
      ],
      "title": "RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98365",
    "datePublished": "2026-10-06T08:46:50.834Z",
    "dateReserved": "2026-09-25T10:25:14.344Z",
    "dateUpdated": "2026-10-07T06:50:18.479Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-3P8H-WX5X-6QQ3

CVE-2026-98365 (GCVE-0-2026-98365)

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