github - ghsa-9gr8-3pvc-4w93

GHSA-9GR8-3PVC-4W93

Vulnerability from github – Published: 2025-04-01 18:30 – Updated: 2025-10-31 21:30

Details

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

sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()

If a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids range) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel crash.

To prevent this, validate prev_cpu in scx_bpf_select_cpu_dfl() and trigger an scx error if an invalid CPU is specified.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21965"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-01T16:15:27Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()\n\nIf a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids\nrange) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel\ncrash.\n\nTo prevent this, validate prev_cpu in scx_bpf_select_cpu_dfl() and\ntrigger an scx error if an invalid CPU is specified.",
  "id": "GHSA-9gr8-3pvc-4w93",
  "modified": "2025-10-31T21:30:53Z",
  "published": "2025-04-01T18:30:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21965"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/515680e76c536dd4aa8e2b5d674b0d441baddf5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/752b56bb76e2471197d25d6948d85753043b10da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9360dfe4cbd62ff1eb8217b815964931523b75b3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-21965 (GCVE-0-2025-21965)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:47 – Updated: 2025-05-04 07:25

Title

sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()

Summary

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl() If a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids range) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel crash. To prevent this, validate prev_cpu in scx_bpf_select_cpu_dfl() and trigger an scx error if an invalid CPU is specified.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/752b56bb76e247119…
	https://git.kernel.org/stable/c/515680e76c536dd4a…
	https://git.kernel.org/stable/c/9360dfe4cbd62ff1e…

Impacted products

Vendor

Product

Version

Linux

Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 752b56bb76e2471197d25d6948d85753043b10da (git)
Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 515680e76c536dd4aa8e2b5d674b0d441baddf5b (git)
Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 9360dfe4cbd62ff1eb8217b815964931523b75b3 (git)

Linux

Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.20 , ≤ 6.12.* (semver)
Unaffected: 6.13.8 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "752b56bb76e2471197d25d6948d85753043b10da",
              "status": "affected",
              "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
              "versionType": "git"
            },
            {
              "lessThan": "515680e76c536dd4aa8e2b5d674b0d441baddf5b",
              "status": "affected",
              "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
              "versionType": "git"
            },
            {
              "lessThan": "9360dfe4cbd62ff1eb8217b815964931523b75b3",
              "status": "affected",
              "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.20",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()\n\nIf a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids\nrange) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel\ncrash.\n\nTo prevent this, validate prev_cpu in scx_bpf_select_cpu_dfl() and\ntrigger an scx error if an invalid CPU is specified."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:25:55.365Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/515680e76c536dd4aa8e2b5d674b0d441baddf5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9360dfe4cbd62ff1eb8217b815964931523b75b3"
        }
      ],
      "title": "sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21965",
    "datePublished": "2025-04-01T15:47:01.129Z",
    "dateReserved": "2024-12-29T08:45:45.796Z",
    "dateUpdated": "2025-05-04T07:25:55.365Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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-9GR8-3PVC-4W93

CVE-2025-21965 (GCVE-0-2025-21965)

Tags

Sightings

Nomenclature