Vulnerability-Lookup

GHSA-4M2C-P8VW-33GR

Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31

Details

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

cifs: don't update i_size in cifs_do_truncate without a cached handle

If find_writable_file() returns null, cifs_file_flush will return 0 without issuing set_file_size, and the outer 'if (!rc)' block will set i_size to 0 before telling the server to truncate. If the cifs_open() then fails, the inode will have size 0, while the server file is unchanged.

Move the netfs_resize_file() and cifs_setsize() into the 'if (cfile)', so they only run after a successful set_file_size.

In the no-handle else branch, evict stale pages with truncate_inode_pages before the O_TRUNC open to dispose of old cache pages, and let the open response set the i_size.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99137"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:33Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don\u0027t update i_size in cifs_do_truncate without a cached handle\n\nIf find_writable_file() returns null, cifs_file_flush will return\n0 without issuing set_file_size, and the outer \u0027if (!rc)\u0027 block\nwill set i_size to 0 before telling the server to truncate.  If\nthe cifs_open() then fails, the inode will have size 0, while\nthe server file is unchanged.\n\nMove the netfs_resize_file() and cifs_setsize() into the \u0027if\n(cfile)\u0027, so they only run after a successful set_file_size.\n\nIn the no-handle else branch, evict stale pages with\ntruncate_inode_pages before the O_TRUNC open to dispose of old\ncache pages, and let the open response set the i_size.",
  "id": "GHSA-4m2c-p8vw-33gr",
  "modified": "2026-10-28T12:31:04Z",
  "published": "2026-10-28T12:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99137"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/04d020b3d0b58a1b7e116900e4095b96a7f4e11a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88a51743cd8094b76fd910f53f718747c7729cc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe39cd9d48f2346605f3746e0cc19e89d5f373eb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99137 (GCVE-0-2026-99137)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34

Title

cifs: don't update i_size in cifs_do_truncate without a cached handle

Summary

In the Linux kernel, the following vulnerability has been resolved: cifs: don't update i_size in cifs_do_truncate without a cached handle If find_writable_file() returns null, cifs_file_flush will return 0 without issuing set_file_size, and the outer 'if (!rc)' block will set i_size to 0 before telling the server to truncate. If the cifs_open() then fails, the inode will have size 0, while the server file is unchanged. Move the netfs_resize_file() and cifs_setsize() into the 'if (cfile)', so they only run after a successful set_file_size. In the no-handle else branch, evict stale pages with truncate_inode_pages before the O_TRUNC open to dispose of old cache pages, and let the open response set the i_size.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/04d020b3d0b58a1b7…
https://git.kernel.org/stable/c/88a51743cd8094b76…
https://git.kernel.org/stable/c/fe39cd9d48f234660…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 110fee6b9bb58a5c50047fc2594d415f741b591e , < 04d020b3d0b58a1b7e116900e4095b96a7f4e11a (git) Affected: 110fee6b9bb58a5c50047fc2594d415f741b591e , < 88a51743cd8094b76fd910f53f718747c7729cc8 (git) Affected: 110fee6b9bb58a5c50047fc2594d415f741b591e , < fe39cd9d48f2346605f3746e0cc19e89d5f373eb (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.59 , ≤ 6.18.* (semver) Unaffected: 7.2.13 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/file.c"
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "110fee6b9bb58a5c50047fc2594d415f741b591e",
              "versionType": "git"
            },
            {
              "lessThan": "fe39cd9d48f2346605f3746e0cc19e89d5f373eb",
              "status": "affected",
              "version": "110fee6b9bb58a5c50047fc2594d415f741b591e",
              "versionType": "git"
            }
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          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.13",
              "versionType": "semver"
            },
            {
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.18",
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                }
              ],
              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don\u0027t update i_size in cifs_do_truncate without a cached handle\n\nIf find_writable_file() returns null, cifs_file_flush will return\n0 without issuing set_file_size, and the outer \u0027if (!rc)\u0027 block\nwill set i_size to 0 before telling the server to truncate.  If\nthe cifs_open() then fails, the inode will have size 0, while\nthe server file is unchanged.\n\nMove the netfs_resize_file() and cifs_setsize() into the \u0027if\n(cfile)\u0027, so they only run after a successful set_file_size.\n\nIn the no-handle else branch, evict stale pages with\ntruncate_inode_pages before the O_TRUNC open to dispose of old\ncache pages, and let the open response set the i_size."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:34:49.266Z",
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      ],
      "title": "cifs: don\u0027t update i_size in cifs_do_truncate without a cached handle",
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    "dateReserved": "2026-09-25T10:25:14.395Z",
    "dateUpdated": "2026-10-28T10:34:49.266Z",
    "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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