Vulnerability-Lookup

GHSA-3X6R-43QP-FXH7

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

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

netfs: zero gaps in read-gaps folio to avoid writing back stale data

netfs_read_gaps() leaves gaps around a streaming write's dirty region unread on the server side, so a short/EOF response there left stale folio content that later got written back.

Zero it after the read completes, not before: netfs_wait_for_read() returns rreq->transferred once ret >= 0, so build an iterator over the same bvec array the read used, advance past ret, and zero the rest. The dirty region already maps to sink pages in that array rather than the real folio, so this can't touch it, and only the actual shortfall gets zeroed instead of the whole gap upfront.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98843"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: zero gaps in read-gaps folio to avoid writing back stale data\n\nnetfs_read_gaps() leaves gaps around a streaming write\u0027s dirty region\nunread on the server side, so a short/EOF response there left stale\nfolio content that later got written back.\n\nZero it after the read completes, not before: netfs_wait_for_read()\nreturns rreq-\u003etransferred once ret \u003e= 0, so build an iterator over the\nsame bvec array the read used, advance past ret, and zero the rest.\nThe dirty region already maps to sink pages in that array rather than\nthe real folio, so this can\u0027t touch it, and only the actual shortfall\ngets zeroed instead of the whole gap upfront.",
  "id": "GHSA-3x6r-43qp-fxh7",
  "modified": "2026-10-18T18:32:05Z",
  "published": "2026-10-18T18:32:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98843"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a62fe628a877c249c8286b157ee99d82840d9dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/512eaf01ffabf4258e945016b50df5aed940b705"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8db55c5cd831a786a1a2a2d391aa80354535a353"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98843 (GCVE-0-2026-98843)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:50 – Updated: 2026-10-18 15:50

Title

netfs: zero gaps in read-gaps folio to avoid writing back stale data

Summary

In the Linux kernel, the following vulnerability has been resolved: netfs: zero gaps in read-gaps folio to avoid writing back stale data netfs_read_gaps() leaves gaps around a streaming write's dirty region unread on the server side, so a short/EOF response there left stale folio content that later got written back. Zero it after the read completes, not before: netfs_wait_for_read() returns rreq->transferred once ret >= 0, so build an iterator over the same bvec array the read used, advance past ret, and zero the rest. The dirty region already maps to sink pages in that array rather than the real folio, so this can't touch it, and only the actual shortfall gets zeroed instead of the whole gap upfront.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7100 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/512eaf01ffabf4258…
https://git.kernel.org/stable/c/2a62fe628a877c249…
https://git.kernel.org/stable/c/8db55c5cd831a786a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 512eaf01ffabf4258e945016b50df5aed940b705 (git) Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 2a62fe628a877c249c8286b157ee99d82840d9dc (git) Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 8db55c5cd831a786a1a2a2d391aa80354535a353 (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3-rc6 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/netfs/buffered_read.c"
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            },
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                }
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              "negate": false,
              "operator": "OR"
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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