CVE-2025-38028 (GCVE-0-2025-38028)
Vulnerability from cvelistv5
Published
2025-06-18 09:28
Modified
2026-08-05 11:59
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFS/localio: Fix a race in nfs_local_open_fh() Once the clp->cl_uuid.lock has been dropped, another CPU could come in and free the struct nfsd_file that was just added. To prevent that from happening, take the RCU read lock before dropping the spin lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 86e00412254a717ffd5d38dc5ec0ee1cce6281b3
Version: 86e00412254a717ffd5d38dc5ec0ee1cce6281b3
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "185a2f2ddabdcf999823f61de67f86376883920d",
              "status": "affected",
              "version": "86e00412254a717ffd5d38dc5ec0ee1cce6281b3",
              "versionType": "git"
            },
            {
              "lessThan": "fa7ab64f1e2fdc8f2603aab8e0dd20de89cb10d9",
              "status": "affected",
              "version": "86e00412254a717ffd5d38dc5ec0ee1cce6281b3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.8",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS/localio: Fix a race in nfs_local_open_fh()\n\nOnce the clp-\u003ecl_uuid.lock has been dropped, another CPU could come in\nand free the struct nfsd_file that was just added. To prevent that from\nhappening, take the RCU read lock before dropping the spin lock."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is the NFS client LOCALIO fast path, reached by ordinary read/write/commit syscalls against a mounted NFS filesystem (nfs_generic_pg_pgios and nfs_initiate_commit both call nfs_local_open_fh). LOCALIO by definition requires the nfsd server to be on the same host, so there is no remote packet path to this code.\nAC:L - The attacker controls both sides of the race: one set of threads issues concurrent I/O to enter nfs_local_open_fh, while another forces nfs_localio_disable_client()/nfs_uuid_put() to free the cached nfsd_file (via -ENOMEM/-ENXIO/-ENOENT from __nfs_local_open_fh or -EAGAIN from nfs_local_doio). The window is repeatedly retriable at will and widened by preemption under CPU pressure.\nPR:L - Any unprivileged local user with access to files on a LOCALIO-enabled NFS mount can drive both sides purely with read/write/close syscalls; no capability check exists anywhere along nfs_generic_pg_pgios \u2192 nfs_local_open_fh. The mount itself is a deployment precondition rather than a privilege the attacker must hold.\nUI:N - The attacker triggers the race entirely from their own concurrent threads; no victim action is needed once the localio mount exists.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - If the freed nfsd_file slot is reallocated, nfs_local_open_fh returns a pointer to a different live nfsd_file whose nf_file is then used for the NFS read, disclosing the contents of an unrelated file on the exported filesystem; more generally a UAF on the slab yields an arbitrary-read primitive.\nI:H - refcount_inc_not_zero() writes into freed/reallocated memory, and the returned stale nfsd_file is used for write_iter, corrupting a different file\u0027s data as well as another object\u0027s refcount, which enables a follow-on premature free and control-flow hijack.\nA:H - Use-after-free on the nfsd_file slab causes refcount warnings, slab corruption and oops/panic, and the corrupted refcount leads to a second premature free of a live nfsd_file \u2014 a repeatable local denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:59:03.121Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/185a2f2ddabdcf999823f61de67f86376883920d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa7ab64f1e2fdc8f2603aab8e0dd20de89cb10d9"
        }
      ],
      "title": "NFS/localio: Fix a race in nfs_local_open_fh()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38028",
    "datePublished": "2025-06-18T09:28:33.184Z",
    "dateReserved": "2025-04-16T04:51:23.978Z",
    "dateUpdated": "2026-08-05T11:59:03.121Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.