GHSA-9Q78-C4FV-64Q9

Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2026-01-23 03:30
VLAI?
Details

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

cifs: prevent NULL pointer dereference in UTF16 conversion

There can be a NULL pointer dereference bug here. NULL is passed to __cifs_sfu_make_node without checks, which passes it unchecked to cifs_strndup_to_utf16, which in turn passes it to cifs_local_to_utf16_bytes where '*from' is dereferenced, causing a crash.

This patch adds a check for NULL 'src' in cifs_strndup_to_utf16 and returns NULL early to prevent dereferencing NULL pointer.

Found by Linux Verification Center (linuxtesting.org) with SVACE

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-39838"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-19T16:15:42Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: prevent NULL pointer dereference in UTF16 conversion\n\nThere can be a NULL pointer dereference bug here. NULL is passed to\n__cifs_sfu_make_node without checks, which passes it unchecked to\ncifs_strndup_to_utf16, which in turn passes it to\ncifs_local_to_utf16_bytes where \u0027*from\u0027 is dereferenced, causing a crash.\n\nThis patch adds a check for NULL \u0027src\u0027 in cifs_strndup_to_utf16 and\nreturns NULL early to prevent dereferencing NULL pointer.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE",
  "id": "GHSA-9q78-c4fv-64q9",
  "modified": "2026-01-23T03:30:28Z",
  "published": "2025-09-22T21:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39838"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cfa5dd05847137f0fb3ce74ced80c0b4858d716"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65b98a7e65e7a8f3894d8760cd194eaf20504c99"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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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