Vulnerability-Lookup

GHSA-6W6R-Q9PW-CWQ6

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: Validate SQE128 flag before accessing the cmd

ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before IO_URING_F_SQE128 flag check. This could cause out of boundary memory access.

Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return -EINVAL immediately if the flag is not set.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45962"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: Validate SQE128 flag before accessing the cmd\n\nublk_ctrl_cmd_dump() accesses (header *)sqe-\u003ecmd before\nIO_URING_F_SQE128 flag check. This could cause out of boundary memory\naccess.\n\nMove the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return\n-EINVAL immediately if the flag is not set.",
  "id": "GHSA-6w6r-q9pw-cwq6",
  "modified": "2026-05-27T15:33:18Z",
  "published": "2026-05-27T15:33:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45962"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17d33ba7291100008360b5a354962db37ad80684"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31cac6acf77ece488f29fb8f79589d9298e969c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b4dff498f46e9802f71bc84258bf73065f51c6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da7e4b75e50c087d2031a92f6646eb90f7045a67"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbe8e81a2ec608f87f79a34f6444cd62f6a243bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f75a5555e0049e7857eae25b60aee98b80e287ec"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45962 (GCVE-0-2026-45962)

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

Title

ublk: Validate SQE128 flag before accessing the cmd

Summary

In the Linux kernel, the following vulnerability has been resolved: ublk: Validate SQE128 flag before accessing the cmd ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before IO_URING_F_SQE128 flag check. This could cause out of boundary memory access. Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return -EINVAL immediately if the flag is not set.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/4b4dff498f46e9802…
https://git.kernel.org/stable/c/31cac6acf77ece488…
https://git.kernel.org/stable/c/dbe8e81a2ec608f87…
https://git.kernel.org/stable/c/f75a5555e0049e785…
https://git.kernel.org/stable/c/17d33ba7291100008…
https://git.kernel.org/stable/c/da7e4b75e50c087d2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 71f28f3136aff5890cd56de78abc673f8393cad9 , < 4b4dff498f46e9802f71bc84258bf73065f51c6a (git) Affected: 71f28f3136aff5890cd56de78abc673f8393cad9 , < 31cac6acf77ece488f29fb8f79589d9298e969c8 (git) Affected: 71f28f3136aff5890cd56de78abc673f8393cad9 , < dbe8e81a2ec608f87f79a34f6444cd62f6a243bb (git) Affected: 71f28f3136aff5890cd56de78abc673f8393cad9 , < f75a5555e0049e7857eae25b60aee98b80e287ec (git) Affected: 71f28f3136aff5890cd56de78abc673f8393cad9 , < 17d33ba7291100008360b5a354962db37ad80684 (git) Affected: 71f28f3136aff5890cd56de78abc673f8393cad9 , < da7e4b75e50c087d2031a92f6646eb90f7045a67 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
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      "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": [
            {
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              "status": "affected",
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              "status": "affected",
              "version": "71f28f3136aff5890cd56de78abc673f8393cad9",
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        },
        {
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            "drivers/block/ublk_drv.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "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": [
                {
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: Validate SQE128 flag before accessing the cmd\n\nublk_ctrl_cmd_dump() accesses (header *)sqe-\u003ecmd before\nIO_URING_F_SQE128 flag check. This could cause out of boundary memory\naccess.\n\nMove the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return\n-EINVAL immediately if the flag is not set."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:18:19.070Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4b4dff498f46e9802f71bc84258bf73065f51c6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/31cac6acf77ece488f29fb8f79589d9298e969c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbe8e81a2ec608f87f79a34f6444cd62f6a243bb"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/da7e4b75e50c087d2031a92f6646eb90f7045a67"
        }
      ],
      "title": "ublk: Validate SQE128 flag before accessing the cmd",
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        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45962",
    "datePublished": "2026-05-27T12:18:19.070Z",
    "dateReserved": "2026-05-13T15:03:33.089Z",
    "dateUpdated": "2026-05-27T12:18:19.070Z",
    "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-6W6R-Q9PW-CWQ6

CVE-2026-45962 (GCVE-0-2026-45962)

Tags

Sightings

Nomenclature