fkie_cve-2025-39838
Vulnerability from fkie_nvd
Published
2025-09-19 16:15
Modified
2025-09-22 21:23
Severity ?
Summary
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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cfa5dd05847137f0fb3ce74ced80c0b4858d716
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65b98a7e65e7a8f3894d8760cd194eaf20504c99
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2025-39838",
  "lastModified": "2025-09-22T21:23:01.543",
  "metrics": {},
  "published": "2025-09-19T16:15:42.457",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1cfa5dd05847137f0fb3ce74ced80c0b4858d716"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/65b98a7e65e7a8f3894d8760cd194eaf20504c99"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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