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GHSA-93G4-3JVG-HJGX

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

Details

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

debugfs: Fix lockdown check for mmap_prepare

Commit 651fdda8406d ("relay: update relay to use mmap_prepare") changed the mmap file operation to mmap_prepare for relayfs, but the lockdown check in debugfs was not updated accordingly.

This prevents debugfs from being locked down when the kernel is in integrity mode if a file uses mmap_prepare but not mmap.

Since the conversion to mmap_prepare across the kernel is not yet complete, update the lockdown check to look for both mmap and mmap_prepare to ensure comprehensive coverage.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89745"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:20:05Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndebugfs: Fix lockdown check for mmap_prepare\n\nCommit 651fdda8406d (\"relay: update relay to use mmap_prepare\")\nchanged the `mmap` file operation to `mmap_prepare` for relayfs, but\nthe lockdown check in debugfs was not updated accordingly.\n\nThis prevents debugfs from being locked down when the kernel is in\nintegrity mode if a file uses `mmap_prepare` but not `mmap`.\n\nSince the conversion to `mmap_prepare` across the kernel is not yet\ncomplete, update the lockdown check to look for both `mmap` and\n`mmap_prepare` to ensure comprehensive coverage.",
  "id": "GHSA-93g4-3jvg-hjgx",
  "modified": "2026-09-11T21:31:39Z",
  "published": "2026-09-11T21:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89745"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89745 (GCVE-0-2026-89745)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-11 19:46

Title

debugfs: Fix lockdown check for mmap_prepare

Summary

In the Linux kernel, the following vulnerability has been resolved: debugfs: Fix lockdown check for mmap_prepare Commit 651fdda8406d ("relay: update relay to use mmap_prepare") changed the `mmap` file operation to `mmap_prepare` for relayfs, but the lockdown check in debugfs was not updated accordingly. This prevents debugfs from being locked down when the kernel is in integrity mode if a file uses `mmap_prepare` but not `mmap`. Since the conversion to `mmap_prepare` across the kernel is not yet complete, update the lockdown check to look for both `mmap` and `mmap_prepare` to ensure comprehensive coverage.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/e7f6a6b5741d16fda…
https://git.kernel.org/stable/c/f81808de37338aac8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 651fdda8406d42a5004c5c79f269540a85d6a1ab , < e7f6a6b5741d16fdac7adaecbe0fa52ae756f208 (git) Affected: 651fdda8406d42a5004c5c79f269540a85d6a1ab , < f81808de37338aac8e167f99bfae647b1b835c70 (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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          "programFiles": [
            "fs/debugfs/file.c"
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          "vendor": "Linux",
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              "versionType": "original_commit_for_fix"
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    "datePublished": "2026-09-11T19:46:50.758Z",
    "dateReserved": "2026-09-11T19:38:34.762Z",
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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.
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