Vulnerability-Lookup

GHSA-PMMG-3C8M-93Q3

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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

efivarfs: Rate limit statfs() handler

Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs.

So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89604"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nefivarfs: Rate limit statfs() handler\n\nRavi reports that statfs() may be called by unprivileged users on the\nefivarfs mount point, which may result in a flood of calls to the\nQueryVariableInfo() runtime service. These calls are disproportionately\ncostly on x86 systems where the variable store is backed by SMM, as each\nSMM entry requires a rendez-vous of all the CPUs.\n\nSo rate limit the calls to QueryVariableInfo() at twice per second, and\nreturn the most recently obtained value for calls that are elided.",
  "id": "GHSA-pmmg-3c8m-93q3",
  "modified": "2026-09-14T15:32:31Z",
  "published": "2026-09-11T21:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89604"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89604 (GCVE-0-2026-89604)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01

Title

efivarfs: Rate limit statfs() handler

Summary

In the Linux kernel, the following vulnerability has been resolved: efivarfs: Rate limit statfs() handler Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs. So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/97d71ebee48cd1b29…
https://git.kernel.org/stable/c/3cd611c9f1dbcc116…
https://git.kernel.org/stable/c/8953bdd1b9c0e748d…
https://git.kernel.org/stable/c/92895a14329cc9533…
https://git.kernel.org/stable/c/0dbc2e94b81df5a12…
https://git.kernel.org/stable/c/b2326338dc683e8c1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 115409cbb6a296d73702a62c54c5b1b11cb88b3d , < 97d71ebee48cd1b29091762b3e5cca4f815dd84c (git) Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae (git) Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 (git) Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 92895a14329cc9533e2a74a265214f690ba3851a (git) Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < 0dbc2e94b81df5a1264068b6ed3605c654b8afcb (git) Affected: d86ff3333cb1d5f42d8898fb5fdb304e143c0237 , < b2326338dc683e8c1067c0cbf7a47986c4190902 (git) Affected: 6.1.178 , < 6.1.188 (semver)
Linux	Linux	Affected: 6.5 Unaffected: 0 , < 6.5 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
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              "versionType": "semver"
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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.

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