Vulnerability-Lookup

GHSA-4VGQ-CGVQ-HG3W

Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31

Details

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

nfsd: initialize DRC hash table before registering shrinker

shrinker_register() precedes the INIT_LIST_HEAD loop and the drc_hashsize store. On weakly-ordered architectures (arm64, ppc), a shrinker scan can observe drc_hashsize before the bucket list heads are initialized, causing a NULL deref in the DRC shrinker callback.

Move bucket initialization and the drc_hashsize store before shrinker_register() so the hash table is fully initialized before it becomes visible to the shrinker.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93211"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-24T16:17:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: initialize DRC hash table before registering shrinker\n\nshrinker_register() precedes the INIT_LIST_HEAD loop and the\ndrc_hashsize store. On weakly-ordered architectures (arm64, ppc),\na shrinker scan can observe drc_hashsize before the bucket list\nheads are initialized, causing a NULL deref in the DRC shrinker\ncallback.\n\nMove bucket initialization and the drc_hashsize store before\nshrinker_register() so the hash table is fully initialized before\nit becomes visible to the shrinker.",
  "id": "GHSA-4vgq-cgvq-hg3w",
  "modified": "2026-09-24T18:31:22Z",
  "published": "2026-09-24T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93211"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/431c70ca5163c98c746f22f16cd58ca5aefec6dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0c58934f5cc4f05b63ef6605dd10c1d0d489e88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b57bd8cb739cb3cf88bdb1a5903a42a707a5c282"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f060f43a67635dbb393bf5dcbfc3e8b9a44942cb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93211 (GCVE-0-2026-93211)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:10 – Updated: 2026-09-24 15:10

Title

nfsd: initialize DRC hash table before registering shrinker

Summary

In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize DRC hash table before registering shrinker shrinker_register() precedes the INIT_LIST_HEAD loop and the drc_hashsize store. On weakly-ordered architectures (arm64, ppc), a shrinker scan can observe drc_hashsize before the bucket list heads are initialized, causing a NULL deref in the DRC shrinker callback. Move bucket initialization and the drc_hashsize store before shrinker_register() so the hash table is fully initialized before it becomes visible to the shrinker.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/f060f43a67635dbb3…
https://git.kernel.org/stable/c/b57bd8cb739cb3cf8…
https://git.kernel.org/stable/c/431c70ca5163c98c7…
https://git.kernel.org/stable/c/b0c58934f5cc4f05b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 , < f060f43a67635dbb393bf5dcbfc3e8b9a44942cb (git) Affected: 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 , < b57bd8cb739cb3cf88bdb1a5903a42a707a5c282 (git) Affected: 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 , < 431c70ca5163c98c746f22f16cd58ca5aefec6dc (git) Affected: 8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 , < b0c58934f5cc4f05b63ef6605dd10c1d0d489e88 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfscache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "b57bd8cb739cb3cf88bdb1a5903a42a707a5c282",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "431c70ca5163c98c746f22f16cd58ca5aefec6dc",
              "status": "affected",
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        },
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          ],
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          "vendor": "Linux",
          "versions": [
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            },
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
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              "version": "7.2.4",
              "versionType": "semver"
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
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        }
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      "title": "nfsd: initialize DRC hash table before registering shrinker",
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    "dateReserved": "2026-09-17T16:02:15.093Z",
    "dateUpdated": "2026-09-24T15:10:34.407Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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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.

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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GHSA-4VGQ-CGVQ-HG3W

CVE-2026-93211 (GCVE-0-2026-93211)

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