Vulnerability-Lookup

GHSA-P4JX-GH49-76WV

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

RDMA/mlx5: Fix undefined shift of user RQ WQE size

set_rq_size() computes the RQ WQE size as "1 << rq_wqe_shift" based on the user-provided rq_wqe_shift, which is only checked to be greater than 32, so shifts of 32 are still accepted. A shift of 31 also overflows a signed integer, leading to undefined behavior.

Use check_shl_overflow() to compute the RQ WQE size and reject any invalid values.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74297"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:29Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix undefined shift of user RQ WQE size\n\nset_rq_size() computes the RQ WQE size as \"1 \u003c\u003c rq_wqe_shift\" based on\nthe user-provided rq_wqe_shift, which is only checked to be greater than\n32, so shifts of 32 are still accepted. A shift of 31 also overflows a\nsigned integer, leading to undefined behavior.\n\nUse check_shl_overflow() to compute the RQ WQE size and reject any\ninvalid values.",
  "id": "GHSA-p4jx-gh49-76wv",
  "modified": "2026-08-17T06:33:37Z",
  "published": "2026-08-15T06:32:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74297"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42f3d2c8c18b92ea33e506a38b64f1a8986c2823"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b87a2497276a72fd63028e7419abf0fb7ed837b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fc874fdfb366bfb11c62e6af9a831c8be59ddda"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9fff54929cc00849d738faa99f06c32399aeb026"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b732db02a2b04cde393638df19de6251ce62a74e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b746f949c2ac2b041102836095d6d4a2ef21fa75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1dbf52d24a8cb1aa56780ba51b72e7d495f258c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d881d60223aac8fdc12b227d89c76e131e92a9cd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74297 (GCVE-0-2026-74297)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45

Title

RDMA/mlx5: Fix undefined shift of user RQ WQE size

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix undefined shift of user RQ WQE size set_rq_size() computes the RQ WQE size as "1 << rq_wqe_shift" based on the user-provided rq_wqe_shift, which is only checked to be greater than 32, so shifts of 32 are still accepted. A shift of 31 also overflows a signed integer, leading to undefined behavior. Use check_shl_overflow() to compute the RQ WQE size and reject any invalid values.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/9fff54929cc00849d…
https://git.kernel.org/stable/c/b746f949c2ac2b041…
https://git.kernel.org/stable/c/c1dbf52d24a8cb1aa…
https://git.kernel.org/stable/c/6fc874fdfb366bfb1…
https://git.kernel.org/stable/c/42f3d2c8c18b92ea3…
https://git.kernel.org/stable/c/4b87a2497276a72fd…
https://git.kernel.org/stable/c/b732db02a2b04cde3…
https://git.kernel.org/stable/c/d881d60223aac8fdc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < 9fff54929cc00849d738faa99f06c32399aeb026 (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < b746f949c2ac2b041102836095d6d4a2ef21fa75 (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < c1dbf52d24a8cb1aa56780ba51b72e7d495f258c (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < 6fc874fdfb366bfb11c62e6af9a831c8be59ddda (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < 42f3d2c8c18b92ea33e506a38b64f1a8986c2823 (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < 4b87a2497276a72fd63028e7419abf0fb7ed837b (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < b732db02a2b04cde393638df19de6251ce62a74e (git) Affected: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c , < d881d60223aac8fdc12b227d89c76e131e92a9cd (git)
Linux	Linux	Affected: 3.11 Unaffected: 0 , < 3.11 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (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/mlx5/qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9fff54929cc00849d738faa99f06c32399aeb026",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
            {
              "lessThan": "b746f949c2ac2b041102836095d6d4a2ef21fa75",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
            {
              "lessThan": "c1dbf52d24a8cb1aa56780ba51b72e7d495f258c",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
            {
              "lessThan": "6fc874fdfb366bfb11c62e6af9a831c8be59ddda",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
            {
              "lessThan": "42f3d2c8c18b92ea33e506a38b64f1a8986c2823",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
            {
              "lessThan": "4b87a2497276a72fd63028e7419abf0fb7ed837b",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
            {
              "lessThan": "b732db02a2b04cde393638df19de6251ce62a74e",
              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "versionType": "git"
            }
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          ],
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          "versions": [
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              "status": "affected",
              "version": "3.11"
            },
            {
              "lessThan": "3.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
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                },
                {
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                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.11",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                }
              ],
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              "operator": "OR"
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        }
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix undefined shift of user RQ WQE size\n\nset_rq_size() computes the RQ WQE size as \"1 \u003c\u003c rq_wqe_shift\" based on\nthe user-provided rq_wqe_shift, which is only checked to be greater than\n32, so shifts of 32 are still accepted. A shift of 31 also overflows a\nsigned integer, leading to undefined behavior.\n\nUse check_shl_overflow() to compute the RQ WQE size and reject any\ninvalid values."
        }
      ],
      "metrics": [
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - Exploitation requires a local ioctl on /dev/infiniband/uverbs to IB_USER_VERBS_CMD_CREATE_QP; malicious rq_wqe_shift is supplied in mlx5_ib_create_qp userspace data, not from remote RDMA/InfiniBand wire traffic.\nAC:L - An attacker with uverbs access can deterministically pass rq_wqe_shift values 31 or 32 in create_qp driver udata; no races or victim state beyond opening the device and issuing the ioctl are required.\nPR:L - Only local access to the RDMA character device is required (typically rdma group membership on HPC/AI cloud GPU nodes), not init-namespace root; this matches basic local user capability rather than administrator privilege.\nUI:N - No victim interaction is needed; the attacker triggers the flaw entirely through their own create_qp ioctl with crafted mlx5_ib_create_qp fields.\nS:U - Impact stays within the kernel and RDMA context of the attacking process/tenant; it is not a VM-hypervisor or cross-security-authority boundary escape despite using a network-capable NIC.\nC:H - Integer overflow/undefined shift can undersize ib_umem registration while hardware is programmed with a huge RQ stride, enabling out-of-bounds DMA reads and kernel/user memory disclosure beyond the registered queue buffer.\nI:H - Corrupted max_gs (e.g. negative from shift 31) bypasses scatter/gather limits in post_recv, and undersized buffers with oversized hardware stride allow out-of-bounds writes and exploitable memory corruption.\nA:H - Undefined signed shifts and inconsistent queue sizing can cause kernel oops/panic during QP setup or later queue operations, and misprogrammed hardware can hang or crash the host under active RDMA use."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:36.087Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/9fff54929cc00849d738faa99f06c32399aeb026"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d881d60223aac8fdc12b227d89c76e131e92a9cd"
        }
      ],
      "title": "RDMA/mlx5: Fix undefined shift of user RQ WQE size",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74297",
    "datePublished": "2026-08-15T05:58:01.414Z",
    "dateReserved": "2026-08-15T05:44:03.882Z",
    "dateUpdated": "2026-08-17T05:45:36.087Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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-P4JX-GH49-76WV

CVE-2026-74297 (GCVE-0-2026-74297)

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Sightings

Nomenclature