CVE-2026-98683 (GCVE-0-2026-98683)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:45 – Updated: 2026-10-19 09:23
VLAI
Title
smb: client: flush dirty data before zeroing a range
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: flush dirty data before zeroing a range smb3_zero_range() emulates FALLOC_FL_ZERO_RANGE by invalidating the page cache over the target range with truncate_pagecache_range() and then issuing FSCTL_SET_ZERO_DATA to the server. Dirty data was only flushed conditionally, when the range reached or extended EOF. For a purely interior zero range that does not reach EOF, no flush happened, so a dirty folio overlapping the range could be written back to the server after the FSCTL and refill the range that was just zeroed with stale data. Fix this by unconditionally flushing and waiting for dirty data in the range before invalidating the page cache and issuing FSCTL_SET_ZERO_DATA, exactly as was done for smb3_punch_hole() in commit d7d2adcd022b ("smb/client: flush dirty data before punching a hole"); the two paths are structurally identical here. This is observed as generic/363 randomly reading stale data where a zeroed range is expected against Windows Server.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 91d1dfae464987aaf6c79ff51d8674880fb3be77 , < cecf4114069fc19629d284710fd783d56bbca862 (git)
Affected: 91d1dfae464987aaf6c79ff51d8674880fb3be77 , < e8ba21c7e6ef3d4cb617858760673877b2e4a2bb (git)
Affected: 91d1dfae464987aaf6c79ff51d8674880fb3be77 , < 8f8d32c1044f70e46e87550e039a15ff20a4b21c (git)
Affected: 13af7446428771e9e529284d390e7994df8be683 (git)
Affected: 0a9423f99ded38b32bd1864347332cc557e6b141 (git)
Affected: 7dfa4279c55f467a88e653a5d544817181b22aea (git)
Affected: 6.1.110 , < 6.2 (semver)
Affected: 6.6.51 , < 6.7 (semver)
Affected: 6.10.10 , < 6.11 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cecf4114069fc19629d284710fd783d56bbca862",
              "status": "affected",
              "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
              "versionType": "git"
            },
            {
              "lessThan": "e8ba21c7e6ef3d4cb617858760673877b2e4a2bb",
              "status": "affected",
              "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
              "versionType": "git"
            },
            {
              "lessThan": "8f8d32c1044f70e46e87550e039a15ff20a4b21c",
              "status": "affected",
              "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "13af7446428771e9e529284d390e7994df8be683",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0a9423f99ded38b32bd1864347332cc557e6b141",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7dfa4279c55f467a88e653a5d544817181b22aea",
              "versionType": "git"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.110",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.51",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.10",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.110",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.6.51",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.10.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: flush dirty data before zeroing a range\n\nsmb3_zero_range() emulates FALLOC_FL_ZERO_RANGE by invalidating the\npage cache over the target range with truncate_pagecache_range() and\nthen issuing FSCTL_SET_ZERO_DATA to the server.\n\nDirty data was only flushed conditionally, when the range reached or\nextended EOF.  For a purely interior zero range that does not reach\nEOF, no flush happened, so a dirty folio overlapping the range could\nbe written back to the server after the FSCTL and refill the range\nthat was just zeroed with stale data.\n\nFix this by unconditionally flushing and waiting for dirty data in the\nrange before invalidating the page cache and issuing\nFSCTL_SET_ZERO_DATA, exactly as was done for smb3_punch_hole() in\ncommit d7d2adcd022b (\"smb/client: flush dirty data before punching a\nhole\"); the two paths are structurally identical here.\n\nThis is observed as generic/363 randomly reading stale data where a\nzeroed range is expected against Windows Server."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:53.516Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cecf4114069fc19629d284710fd783d56bbca862"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8ba21c7e6ef3d4cb617858760673877b2e4a2bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f8d32c1044f70e46e87550e039a15ff20a4b21c"
        }
      ],
      "title": "smb: client: flush dirty data before zeroing a range",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98683",
    "datePublished": "2026-10-18T15:45:50.014Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-19T09:23:53.516Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98683",
      "date": "2026-10-27",
      "epss": "0.00166",
      "percentile": "0.05777"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:40:11.000Z",
      "cve": "CVE-2026-98683",
      "id": "msrc_CVE-2026-98683",
      "initial_release_date": "2026-10-20T22:24:07.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: flush dirty data before zeroing a range",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98683.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/smb/client/smb2ops.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "cecf4114069fc19629d284710fd783d56bbca862",
                    "status": "affected",
                    "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e8ba21c7e6ef3d4cb617858760673877b2e4a2bb",
                    "status": "affected",
                    "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8f8d32c1044f70e46e87550e039a15ff20a4b21c",
                    "status": "affected",
                    "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "13af7446428771e9e529284d390e7994df8be683",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "0a9423f99ded38b32bd1864347332cc557e6b141",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "7dfa4279c55f467a88e653a5d544817181b22aea",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6.2",
                    "status": "affected",
                    "version": "6.1.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.7",
                    "status": "affected",
                    "version": "6.6.51",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.11",
                    "status": "affected",
                    "version": "6.10.10",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/smb/client/smb2ops.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.11"
                  },
                  {
                    "lessThan": "6.11",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.56",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: flush dirty data before zeroing a range\n\nsmb3_zero_range() emulates FALLOC_FL_ZERO_RANGE by invalidating the\npage cache over the target range with truncate_pagecache_range() and\nthen issuing FSCTL_SET_ZERO_DATA to the server.\n\nDirty data was only flushed conditionally, when the range reached or\nextended EOF.  For a purely interior zero range that does not reach\nEOF, no flush happened, so a dirty folio overlapping the range could\nbe written back to the server after the FSCTL and refill the range\nthat was just zeroed with stale data.\n\nFix this by unconditionally flushing and waiting for dirty data in the\nrange before invalidating the page cache and issuing\nFSCTL_SET_ZERO_DATA, exactly as was done for smb3_punch_hole() in\ncommit d7d2adcd022b (\"smb/client: flush dirty data before punching a\nhole\"); the two paths are structurally identical here.\n\nThis is observed as generic/363 randomly reading stale data where a\nzeroed range is expected against Windows Server."
          }
        ],
        "id": "CVE-2026-98683",
        "lastModified": "2026-10-19T10:19:32.727",
        "metrics": {},
        "published": "2026-10-18T16:17:21.660",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8f8d32c1044f70e46e87550e039a15ff20a4b21c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cecf4114069fc19629d284710fd783d56bbca862"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e8ba21c7e6ef3d4cb617858760673877b2e4a2bb"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-22T03:01:08+00:00",
      "cve": "CVE-2026-98683",
      "id": "CVE-2026-98683",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: flush dirty data before zeroing a range",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98683.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-22T16:35:58Z",
      "cve": "CVE-2026-98683",
      "id": "CVE-2026-98683",
      "initial_release_date": "2026-10-18T23:43:44Z",
      "product_status:known_affected": "13",
      "product_status:known_not_affected": "335",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98683",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98683.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.