CVE-2026-52960 (GCVE-0-2026-52960)
Vulnerability from cvelistv5
Published
2026-06-24 16:28
Modified
2026-08-05 12:32
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ceph: put folios not suitable for writeback The batch holds references to the folios (see `filemap_get_folios`, `folio_batch_release`), so we need to `folio_put` the folios we remove. Tested on v6.18.
References
Impacted products
Vendor Product Version
Linux Linux Version: ce80b76dd32764cc914975777e058d4fae4f0ea0
Version: ce80b76dd32764cc914975777e058d4fae4f0ea0
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/addr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86921e890fe1dea9791fb70bec552516fd47716a",
              "status": "affected",
              "version": "ce80b76dd32764cc914975777e058d4fae4f0ea0",
              "versionType": "git"
            },
            {
              "lessThan": "544576f0f05c4a759806acddfaaeb686f14fb4b0",
              "status": "affected",
              "version": "ce80b76dd32764cc914975777e058d4fae4f0ea0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/addr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: put folios not suitable for writeback\n\nThe batch holds references to the folios (see `filemap_get_folios`,\n`folio_batch_release`), so we need to `folio_put` the folios we remove.\n\nTested on v6.18."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Direct reachability is through CephFS file writeback, and a writable CephFS tree can reasonably be exposed through kernel network fileservers such as nfsd/ksmbd, which drive the same VFS writeback path remotely.\nAC:L - The bug is a deterministic missing folio_put() on skipped writeback folios; an attacker can repeatedly create/write/delete/sync files to accumulate leaked references without needing an uncontrollable race.\nPR:N - In the network-export scenario, the attacker needs no local privileges on the vulnerable host, and writable anonymous or guest-style exports are a reasonable high-severity deployment.\nUI:N - Once the CephFS mount/export exists, exploitation only requires attacker-driven writes and writeback triggers; no victim user action is needed.\nS:U - The impact remains within the vulnerable kernel host and does not cross a separate security authority such as a guest-to-host or IOMMU boundary.\nC:N - The flaw leaks folio references and pins page-cache memory; it does not provide an information disclosure or arbitrary read primitive.\nI:N - The flaw does not corrupt memory or allow unauthorized data modification; it only prevents selected folios from being released.\nA:H - Repeated triggering can leave folios permanently unreclaimable even after unmount/drop_caches, causing severe memory pressure, swapping, allocation failures, and potential system-wide DoS."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:10.671Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86921e890fe1dea9791fb70bec552516fd47716a"
        },
        {
          "url": "https://git.kernel.org/stable/c/544576f0f05c4a759806acddfaaeb686f14fb4b0"
        }
      ],
      "title": "ceph: put folios not suitable for writeback",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52960",
    "datePublished": "2026-06-24T16:28:41.044Z",
    "dateReserved": "2026-06-09T07:44:35.373Z",
    "dateUpdated": "2026-08-05T12:32:10.671Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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