CVE-2022-50235 (GCVE-0-2022-50235)
Vulnerability from cvelistv5
Published
2025-09-15 14:01
Modified
2026-08-05 08:57
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Protect against send buffer overflow in NFSv2 READDIR Restore the previous limit on the @count argument to prevent a buffer overflow attack.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9e291a6a28d32545ed2fd959a8165144d1724df1
Version: eabc0aab98e5218ceecd82069b0d6fdfff5ee885
Version: 53b1119a6e5028b125f431a0116ba73510d82a72
Version: 53b1119a6e5028b125f431a0116ba73510d82a72
Version: 53b1119a6e5028b125f431a0116ba73510d82a72
Version: 5.15.12   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsproc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0e57d696f60dee6117a8ace0cac7c5761d375277",
              "status": "affected",
              "version": "9e291a6a28d32545ed2fd959a8165144d1724df1",
              "versionType": "git"
            },
            {
              "lessThan": "dc7f225090c29a5f3b9419b1af32846a201555e7",
              "status": "affected",
              "version": "eabc0aab98e5218ceecd82069b0d6fdfff5ee885",
              "versionType": "git"
            },
            {
              "lessThan": "c2a878095b5c6f04f90553a3c45872f990dab14e",
              "status": "affected",
              "version": "53b1119a6e5028b125f431a0116ba73510d82a72",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "53b1119a6e5028b125f431a0116ba73510d82a72",
              "versionType": "git"
            },
            {
              "lessThan": "00b4492686e0497fdb924a9d4c8f6f99377e176c",
              "status": "affected",
              "version": "53b1119a6e5028b125f431a0116ba73510d82a72",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.75",
              "status": "affected",
              "version": "5.15.12",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsproc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.75",
                  "versionStartIncluding": "5.15.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.17",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.3",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Protect against send buffer overflow in NFSv2 READDIR\n\nRestore the previous limit on the @count argument to prevent a\nbuffer overflow attack."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerability is in nfsd\u0027s NFSv2 READDIR handler (fs/nfsd/nfsproc.c), reachable over the network via NFS/RPC on TCP/UDP port 2049 from a remote client.\nAC:L - The attacker fully controls the READDIR count argument and can reliably force multi-page encoding by targeting or populating a directory with enough entries; no conditions beyond attacker control are required.\nPR:N - NFSv2 commonly accepts AUTH_NULL/AUTH_UNIX with no cryptographic authentication, so an unauthenticated network client that can reach an exported share can invoke READDIR; this matches sibling nfsd send-buffer overflow scoring (CVE-2022-50410).\nUI:N - Exploitation requires only sending crafted NFS READDIR RPCs; no victim user action is needed.\nS:U - The overflow corrupts memory in the nfsd/kernel context on the same host; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Out-of-bounds writes into adjacent svc rq_pages are kernel memory corruption that can be leveraged for arbitrary read primitives and disclosure of kernel memory.\nI:H - The bug is an attacker-triggered buffer/overflow write past the single reserved dirlist page into adjacent kernel pages, enabling integrity compromise and potential code execution.\nA:H - Kernel memory corruption from the send-buffer overflow can cause oops/panic or otherwise crash the NFS server kernel, fully impacting availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:57:51.543Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0e57d696f60dee6117a8ace0cac7c5761d375277"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc7f225090c29a5f3b9419b1af32846a201555e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2a878095b5c6f04f90553a3c45872f990dab14e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d"
        },
        {
          "url": "https://git.kernel.org/stable/c/00b4492686e0497fdb924a9d4c8f6f99377e176c"
        }
      ],
      "title": "NFSD: Protect against send buffer overflow in NFSv2 READDIR",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50235",
    "datePublished": "2025-09-15T14:01:41.043Z",
    "dateReserved": "2025-06-18T10:57:27.432Z",
    "dateUpdated": "2026-08-05T08:57:51.543Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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