FKIE_CVE-2026-93211

Vulnerability from fkie_nvd - Published: 2026-09-24 16:17 - Updated: 2026-09-24 16:17
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/431c70ca5163c98c746f22f16cd58ca5aefec6dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0c58934f5cc4f05b63ef6605dd10c1d0d489e88
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b57bd8cb739cb3cf88bdb1a5903a42a707a5c282
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f060f43a67635dbb393bf5dcbfc3e8b9a44942cb
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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": [
            {
              "lessThan": "f060f43a67635dbb393bf5dcbfc3e8b9a44942cb",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "b57bd8cb739cb3cf88bdb1a5903a42a707a5c282",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "431c70ca5163c98c746f22f16cd58ca5aefec6dc",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "b0c58934f5cc4f05b63ef6605dd10c1d0d489e88",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfscache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-93211",
  "lastModified": "2026-09-24T16:17:16.007",
  "metrics": {},
  "published": "2026-09-24T16:17:16.007",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/431c70ca5163c98c746f22f16cd58ca5aefec6dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0c58934f5cc4f05b63ef6605dd10c1d0d489e88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b57bd8cb739cb3cf88bdb1a5903a42a707a5c282"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f060f43a67635dbb393bf5dcbfc3e8b9a44942cb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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