Vulnerability-Lookup

GHSA-3Q42-3W8P-XMR3

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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

ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd

struct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in userspace-mapped memory. It's racy to access its fields with normal loads, as userspace may write to them concurrently. Use READ_ONCE() to copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the local copy in place of the one in the io_uring_sqe.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45975"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd\n\nstruct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in\nuserspace-mapped memory. It\u0027s racy to access its fields with normal\nloads, as userspace may write to them concurrently. Use READ_ONCE() to\ncopy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the\nlocal copy in place of the one in the io_uring_sqe.",
  "id": "GHSA-3q42-3w8p-xmr3",
  "modified": "2026-05-27T15:33:19Z",
  "published": "2026-05-27T15:33:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45975"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce63eda3e6d36e2c253febee1c8421ecbd1a680e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed9f54cc1e335096733aed03c2a46de3d58922ed"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45975 (GCVE-0-2026-45975)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-05-27 12:18

Title

ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd

Summary

In the Linux kernel, the following vulnerability has been resolved: ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd struct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in userspace-mapped memory. It's racy to access its fields with normal loads, as userspace may write to them concurrently. Use READ_ONCE() to copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the local copy in place of the one in the io_uring_sqe.

Severity

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/ce63eda3e6d36e2c2…
https://git.kernel.org/stable/c/ed9f54cc1e3350967…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 87213b0d847cd300285b5545598e0548baeb5208 , < ce63eda3e6d36e2c253febee1c8421ecbd1a680e (git) Affected: 87213b0d847cd300285b5545598e0548baeb5208 , < ed9f54cc1e335096733aed03c2a46de3d58922ed (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/ublk_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ce63eda3e6d36e2c253febee1c8421ecbd1a680e",
              "status": "affected",
              "version": "87213b0d847cd300285b5545598e0548baeb5208",
              "versionType": "git"
            },
            {
              "lessThan": "ed9f54cc1e335096733aed03c2a46de3d58922ed",
              "status": "affected",
              "version": "87213b0d847cd300285b5545598e0548baeb5208",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/ublk_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd\n\nstruct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in\nuserspace-mapped memory. It\u0027s racy to access its fields with normal\nloads, as userspace may write to them concurrently. Use READ_ONCE() to\ncopy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the\nlocal copy in place of the one in the io_uring_sqe."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:18:33.939Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ce63eda3e6d36e2c253febee1c8421ecbd1a680e"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed9f54cc1e335096733aed03c2a46de3d58922ed"
        }
      ],
      "title": "ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45975",
    "datePublished": "2026-05-27T12:18:33.939Z",
    "dateReserved": "2026-05-13T15:03:33.090Z",
    "dateUpdated": "2026-05-27T12:18:33.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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.

Action not permitted

GHSA-3Q42-3W8P-XMR3

CVE-2026-45975 (GCVE-0-2026-45975)

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Sightings

Nomenclature