Vulnerability-Lookup

GHSA-8WVC-JP6J-85P4

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

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

bpf: Require a BPF cpumask for bpf_cpumask_populate()

bpf_cpumask_populate() writes to its destination with bitmap_copy(), but the destination is typed as struct cpumask *. That allows the verifier to accept borrowed cpumask pointers returned by read-only kfuncs, such as scx_bpf_get_online_cpumask(), as a writable destination.

Make the destination a struct bpf_cpumask * so populate follows the same ownership rule as the other mutating cpumask kfuncs. Query kfuncs continue to accept const struct cpumask * inputs.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93112"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:05Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Require a BPF cpumask for bpf_cpumask_populate()\n\nbpf_cpumask_populate() writes to its destination with bitmap_copy(), but\nthe destination is typed as struct cpumask *. That allows the verifier to\naccept borrowed cpumask pointers returned by read-only kfuncs, such as\nscx_bpf_get_online_cpumask(), as a writable destination.\n\nMake the destination a struct bpf_cpumask * so populate follows the same\nownership rule as the other mutating cpumask kfuncs. Query kfuncs continue\nto accept const struct cpumask * inputs.",
  "id": "GHSA-8wvc-jp6j-85p4",
  "modified": "2026-09-17T18:32:11Z",
  "published": "2026-09-17T18:32:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93112"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cfc9348a045da64955af2dd6902e66dfc7d6469"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8740156ad33be5071b588b594c55f279457f667c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7e2a5c6519adc73be55c3de2cb545e095a0fbc5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93112 (GCVE-0-2026-93112)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-17 16:11

Title

bpf: Require a BPF cpumask for bpf_cpumask_populate()

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Require a BPF cpumask for bpf_cpumask_populate() bpf_cpumask_populate() writes to its destination with bitmap_copy(), but the destination is typed as struct cpumask *. That allows the verifier to accept borrowed cpumask pointers returned by read-only kfuncs, such as scx_bpf_get_online_cpumask(), as a writable destination. Make the destination a struct bpf_cpumask * so populate follows the same ownership rule as the other mutating cpumask kfuncs. Query kfuncs continue to accept const struct cpumask * inputs.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/0cfc9348a045da649…
https://git.kernel.org/stable/c/b7e2a5c6519adc73b…
https://git.kernel.org/stable/c/8740156ad33be5071…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 950ad93df2fce70445e655ed2e74f5c1a8653ab2 , < 0cfc9348a045da64955af2dd6902e66dfc7d6469 (git) Affected: 950ad93df2fce70445e655ed2e74f5c1a8653ab2 , < b7e2a5c6519adc73be55c3de2cb545e095a0fbc5 (git) Affected: 950ad93df2fce70445e655ed2e74f5c1a8653ab2 , < 8740156ad33be5071b588b594c55f279457f667c (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/cpumask.c",
            "tools/sched_ext/include/scx/compat.bpf.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
            {
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "950ad93df2fce70445e655ed2e74f5c1a8653ab2",
              "versionType": "git"
            },
            {
              "lessThan": "8740156ad33be5071b588b594c55f279457f667c",
              "status": "affected",
              "version": "950ad93df2fce70445e655ed2e74f5c1a8653ab2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
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              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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        }
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                }
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Require a BPF cpumask for bpf_cpumask_populate()\n\nbpf_cpumask_populate() writes to its destination with bitmap_copy(), but\nthe destination is typed as struct cpumask *. That allows the verifier to\naccept borrowed cpumask pointers returned by read-only kfuncs, such as\nscx_bpf_get_online_cpumask(), as a writable destination.\n\nMake the destination a struct bpf_cpumask * so populate follows the same\nownership rule as the other mutating cpumask kfuncs. Query kfuncs continue\nto accept const struct cpumask * inputs."
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          "url": "https://git.kernel.org/stable/c/8740156ad33be5071b588b594c55f279457f667c"
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    "dateReserved": "2026-09-17T16:02:15.086Z",
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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