« Back to list

CVE-2025-38534

Status: AnalyzedMedium (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix copy-to-cache so that it performs collection with ceph+fscache

The netfs copy-to-cache that is used by Ceph with local caching sets up a new request to write data just read to the cache. The request is started and then left to look after itself whilst the app continues. The request gets notified by the backing fs upon completion of the async DIO write, but then tries to wake up the app because NETFS_RREQ_OFFLOAD_COLLECTION isn't set - but the app isn't waiting there, and so the request just hangs.

Fix this by setting NETFS_RREQ_OFFLOAD_COLLECTION which causes the notification from the backing filesystem to put the collection onto a work queue instead.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Linux — Linux Kernel

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2025-38534",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e2d46f2ec332533816417b60933954173f602121",
              "lessThan": "1ebe58cef84eab22b41b4d5e72c2051ebf00af50",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2d46f2ec332533816417b60933954173f602121",
              "lessThan": "4c238e30774e3022a505fa54311273add7570f13",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/netfs/read_pgpriv2.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.15.8",
              "versionType": "semver",
              "lessThanOrEqual": "6.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/netfs/read_pgpriv2.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-08-16T12:15:29.087",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1ebe58cef84eab22b41b4d5e72c2051ebf00af50",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4c238e30774e3022a505fa54311273add7570f13",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix copy-to-cache so that it performs collection with ceph+fscache\n\nThe netfs copy-to-cache that is used by Ceph with local caching sets up a\nnew request to write data just read to the cache.  The request is started\nand then left to look after itself whilst the app continues.  The request\ngets notified by the backing fs upon completion of the async DIO write, but\nthen tries to wake up the app because NETFS_RREQ_OFFLOAD_COLLECTION isn't\nset - but the app isn't waiting there, and so the request just hangs.\n\nFix this by setting NETFS_RREQ_OFFLOAD_COLLECTION which causes the\nnotification from the backing filesystem to put the collection onto a work\nqueue instead."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs: Arreglar la copia a caché para que realice la recolección con ceph+fscache La copia a caché de netfs que usa Ceph con caché local configura una nueva solicitud para escribir datos recién leídos en la caché. La solicitud se inicia y luego se deja que se cuide a sí misma mientras la aplicación continúa. La solicitud es notificada por el sistema de archivos de respaldo al completarse la escritura DIO asíncrona, pero luego intenta despertar la aplicación porque NETFS_RREQ_OFFLOAD_COLLECTION no está configurado, pero la aplicación no está esperando allí, y por lo tanto la solicitud simplemente se cuelga. Arregla esto configurando NETFS_RREQ_OFFLOAD_COLLECTION que hace que la notificación del sistema de archivos de respaldo coloque la recolección en una cola de trabajo."
    }
  ],
  "lastModified": "2026-06-17T09:17:03.667",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3B1D6837-C0C8-4CC6-9D70-85B362FFE711",
              "versionEndExcluding": "6.15.8",
              "versionStartIncluding": "6.14"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "09709862-E348-4378-8632-5A7813EDDC86"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "415BF58A-8197-43F5-B3D7-D1D63057A26E"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A0517869-312D-4429-80C2-561086E1421C"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "85421F4E-C863-4ABF-B4B4-E887CC2F7F92"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3827F0D4-5FEE-4181-B267-5A45E7CA11FC"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}