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GHSA-R85P-J355-CRHR

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-18 18:31

Details

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

smb: client: discard post-EOF pagecache when extending a file via clone range

cifs_remap_file_range() discarded the pagecache only for the folios overlapping the destination region, so when a clone extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended.

Start the discard at the smaller of fstart and the old EOF. i_size is still old here, so nothing past the old EOF is flushed to the server.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98685"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:21Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: discard post-EOF pagecache when extending a file via clone range\n\ncifs_remap_file_range() discarded the pagecache only for the folios\noverlapping the destination region, so when a clone extends the file the\nfolio straddling the old EOF - which may hold data dirtied past EOF\nthrough an mmap - was never dropped and became visible as file content\nonce the file was extended.\n\nStart the discard at the smaller of fstart and the old EOF.  i_size is\nstill old here, so nothing past the old EOF is flushed to the server.",
  "id": "GHSA-r85p-j355-crhr",
  "modified": "2026-10-18T18:31:59Z",
  "published": "2026-10-18T18:31:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98685"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15bb9f1d3e967e328649e92a1451e60a0dc66118"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4721587f96cb8de8164f3fd203093a0875560999"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98685 (GCVE-0-2026-98685)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:45 – Updated: 2026-10-19 09:23

Title

smb: client: discard post-EOF pagecache when extending a file via clone range

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: discard post-EOF pagecache when extending a file via clone range cifs_remap_file_range() discarded the pagecache only for the folios overlapping the destination region, so when a clone extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Start the discard at the smaller of fstart and the old EOF. i_size is still old here, so nothing past the old EOF is flushed to the server.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6820 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/15bb9f1d3e967e328…
https://git.kernel.org/stable/c/4721587f96cb8de81…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c54fc3a4f375663f2361a9cbb2955fb4ef912879 , < 15bb9f1d3e967e328649e92a1451e60a0dc66118 (git) Affected: c54fc3a4f375663f2361a9cbb2955fb4ef912879 , < 4721587f96cb8de8164f3fd203093a0875560999 (git) Affected: 358bd5f436d820bb758833050aae065b35d6986c (git) Affected: 43801359c8971cc49b4a4db5015fba77fbd09c32 (git) Affected: 6.1.68 , < 6.2 (semver) Affected: 6.6.7 , < 6.7 (semver)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifsfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "15bb9f1d3e967e328649e92a1451e60a0dc66118",
              "status": "affected",
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              "versionType": "git"
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              "version": "c54fc3a4f375663f2361a9cbb2955fb4ef912879",
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            },
            {
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              "version": "358bd5f436d820bb758833050aae065b35d6986c",
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            },
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            },
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              "status": "affected",
              "version": "6.1.68",
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            },
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              "status": "affected",
              "version": "6.6.7",
              "versionType": "semver"
            }
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        },
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifsfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.68",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: discard post-EOF pagecache when extending a file via clone range\n\ncifs_remap_file_range() discarded the pagecache only for the folios\noverlapping the destination region, so when a clone extends the file the\nfolio straddling the old EOF - which may hold data dirtied past EOF\nthrough an mmap - was never dropped and became visible as file content\nonce the file was extended.\n\nStart the discard at the smaller of fstart and the old EOF.  i_size is\nstill old here, so nothing past the old EOF is flushed to the server."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:55.472Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4721587f96cb8de8164f3fd203093a0875560999"
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    "datePublished": "2026-10-18T15:45:53.821Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-19T09:23:55.472Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

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.

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