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CVE-2022-48827 (GCVE-0-2022-48827)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:44 – Updated: 2026-08-05 08:52
VLAI
Title
NFSD: Fix the behavior of READ near OFFSET_MAX
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix the behavior of READ near OFFSET_MAX Dan Aloni reports: > Due to commit 8cfb9015280d ("NFS: Always provide aligned buffers to > the RPC read layers") on the client, a read of 0xfff is aligned up > to server rsize of 0x1000. > > As a result, in a test where the server has a file of size > 0x7fffffffffffffff, and the client tries to read from the offset > 0x7ffffffffffff000, the read causes loff_t overflow in the server > and it returns an NFS code of EINVAL to the client. The client as > a result indefinitely retries the request. The Linux NFS client does not handle NFS?ERR_INVAL, even though all NFS specifications permit servers to return that status code for a READ. Instead of NFS?ERR_INVAL, have out-of-range READ requests succeed and return a short result. Set the EOF flag in the result to prevent the client from retrying the READ request. This behavior appears to be consistent with Solaris NFS servers. Note that NFSv3 and NFSv4 use u64 offset values on the wire. These must be converted to loff_t internally before use -- an implicit type cast is not adequate for this purpose. Otherwise VFS checks against sb->s_maxbytes do not work properly.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:57 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1726a39b0879acfb490b22dca643f26f4f907da9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c6eff5c4277146a78b4fb8c9b668dd64542c41b0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 44502aca8e02ab32d6b0eb52e006a5ec9402719b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.220 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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Siemens RUGGEDCOM RST2428P Unaffected: 0 , < * (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Unaffected: 0 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSD: corrige el comportamiento de READ cerca de OFFSET_MAX Dan Aloni informa: \u0026gt; Debido a El commit 8cfb9015280d (\"NFS: siempre proporcione buffers alineados a \u0026gt; las capas de lectura RPC\") en el cliente, una lectura de 0xfff est\u00e1 alineada con el tama\u00f1o del servidor de 0x1000. \u0026gt; \u0026gt; Como resultado, en una prueba donde el servidor tiene un archivo de tama\u00f1o \u0026gt; 0x7ffffffffffffffff, y el cliente intenta leer desde el desplazamiento \u0026gt; 0x7ffffffffffffff000, la lectura causa que loff_t se desborde en el servidor \u0026gt; y devuelve un c\u00f3digo NFS de EINVAL a el cliente. Como resultado, el cliente reintenta indefinidamente la solicitud. El cliente NFS de Linux no maneja NFS?ERR_INVAL, aunque todas las especificaciones de NFS permiten a los servidores devolver ese c\u00f3digo de estado para una READ. En lugar de NFS?ERR_INVAL, haga que las solicitudes READ fuera de rango se realicen correctamente y devuelvan un resultado breve. Establezca el indicador EOF en el resultado para evitar que el cliente vuelva a intentar la solicitud READ. Este comportamiento parece ser coherente con los servidores Solaris NFS. Tenga en cuenta que NFSv3 y NFSv4 utilizan valores de compensaci\u00f3n u64 en el cable. Estos deben convertirse a loff_t internamente antes de su uso; una conversi\u00f3n de tipo impl\u00edcita no es adecuada para este prop\u00f3sito. De lo contrario, las comprobaciones de VFS con sb-\u0026gt;s_maxbytes no funcionan correctamente."
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                  "value": "AV:N - The bug is in the in-kernel NFS server (nfsd3_proc_read / nfsd4_read) and is reached by processing NFSv3/v4 READ RPCs over the network (TCP/UDP 2049); a remote NFS client triggers it by reading near OFFSET_MAX.\nAC:L - An attacker who can write to an export on a filesystem that allows MAX_LFS_FILESIZE (e.g. XFS) can create a sparse file of size OFFSET_MAX and then read it; the loff_t overflow and NFSERR_INVAL response occur reliably with no race or other condition outside attacker control.\nPR:N - Typical nfsd deployments use AUTH_SYS/AUTH_NULL with IP-based exports, so a remote peer that can reach the export self-asserts credentials with no cryptographic authentication and can open/read (and create) files that exercise the READ path.\nUI:N - The attacker drives file creation and the triggering READ entirely via NFS RPCs; no separate action by a victim user or administrator on the server is required.\nS:U - Impact is confined to the NFS server and its Linux clients\u2019 use of that service within the same host/kernel authority; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:N - The defect only causes an out-of-range READ to fail with NFSERR_INVAL after VFS rejects the overflowing loff_t; there is no out-of-bounds read, UAF, or other information-disclosure primitive.\nI:N - There is no memory corruption, OOB write, or attacker-controlled modification of kernel or file data\u2014only a protocol error return for an overflowing offset/length pair.\nA:H - Linux NFS clients treat NFSERR_INVAL as non-fatal, drop the page without PageError, and indefinitely reissue the READ, hanging the reader and continuously hammering nfsd; infinite retry/hang is high availability impact."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:52:32.083Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/1726a39b0879acfb490b22dca643f26f4f907da9"
            },
            {
              "url": "https://git.kernel.org/stable/c/c6eff5c4277146a78b4fb8c9b668dd64542c41b0"
            },
            {
              "url": "https://git.kernel.org/stable/c/44502aca8e02ab32d6b0eb52e006a5ec9402719b"
            },
            {
              "url": "https://git.kernel.org/stable/c/0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960"
            }
          ],
          "title": "NFSD: Fix the behavior of READ near OFFSET_MAX",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48827",
        "datePublished": "2024-07-16T11:44:12.019Z",
        "dateReserved": "2024-07-16T11:38:08.903Z",
        "dateUpdated": "2026-08-05T08:52:32.083Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.