CVE-2026-43470 (GCVE-0-2026-43470)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-05-11 22:25
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfs: return EISDIR on nfs3_proc_create if d_alias is a dir If we found an alias through nfs3_do_create/nfs_add_or_obtain /d_splice_alias which happens to be a dir dentry, we don't return any error, and simply forget about this alias, but the original dentry we were adding and passed as parameter remains negative. This later causes an oops on nfs_atomic_open_v23/finish_open since we supply a negative dentry to do_dentry_open. This has been observed running lustre-racer, where dirs and files are created/removed concurrently with the same name and O_EXCL is not used to open files (frequent file redirection). While d_splice_alias typically returns a directory alias or NULL, we explicitly check d_is_dir() to ensure that we don't attempt to perform file operations (like finish_open) on a directory inode, which triggers the observed oops.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7c6c5249f061b64fc6b5b90bc147169a048691bf
Version: 7c6c5249f061b64fc6b5b90bc147169a048691bf
Version: 7c6c5249f061b64fc6b5b90bc147169a048691bf
Version: 7c6c5249f061b64fc6b5b90bc147169a048691bf
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/nfs3proc.c"
          ],
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          "vendor": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.10"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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      "cpeApplicability": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs: return EISDIR on nfs3_proc_create if d_alias is a dir\n\nIf we found an alias through nfs3_do_create/nfs_add_or_obtain\n/d_splice_alias which happens to be a dir dentry, we don\u0027t return\nany error, and simply forget about this alias, but the original\ndentry we were adding and passed as parameter remains negative.\n\nThis later causes an oops on nfs_atomic_open_v23/finish_open since we\nsupply a negative dentry to do_dentry_open.\n\nThis has been observed running lustre-racer, where dirs and files are\ncreated/removed concurrently with the same name and O_EXCL is not\nused to open files (frequent file redirection).\n\nWhile d_splice_alias typically returns a directory alias or NULL, we\nexplicitly check d_is_dir() to ensure that we don\u0027t attempt to perform\nfile operations (like finish_open) on a directory inode, which triggers\nthe observed oops."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:25:13.820Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7e2963773760a664684435201960dd2fb712f1b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/203c792cb4315360d49973ae2e57feeb6d3dcf7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ee1770fcb2f1b48354622b926e7dc10222805f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/410666a298c34ebd57256fde6b24c96bd23059a2"
        }
      ],
      "title": "nfs: return EISDIR on nfs3_proc_create if d_alias is a dir",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43470",
    "datePublished": "2026-05-08T14:22:30.218Z",
    "dateReserved": "2026-05-01T14:12:56.011Z",
    "dateUpdated": "2026-05-11T22:25:13.820Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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