CVE-2025-39967 (GCVE-0-2025-39967)
Vulnerability from cvelistv5
Published
2025-10-15 07:55
Modified
2025-10-15 07:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: fix integer overflow in fbcon_do_set_font Fix integer overflow vulnerabilities in fbcon_do_set_font() where font size calculations could overflow when handling user-controlled font parameters. The vulnerabilities occur when: 1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow. 2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow 3. This results in smaller allocations than expected, leading to buffer overflows during font data copying. Add explicit overflow checking using check_mul_overflow() and check_add_overflow() kernel helpers to safety validate all size calculations before allocation.
References
Impacted products
Vendor Product Version
Linux Linux Version: 96e41fc29e8af5c5085fb8a79cab8d0d00bab86c
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: 39b3cffb8cf3111738ea993e2757ab382253d86a
Version: ae021a904ac82d9fc81c25329d3c465c5a7d5686
Version: 451bffa366f2cc0e5314807cb847f31c0226efed
Version: 2c455e9c5865861f5ce09c5f596909495ed7657c
Version: 72f099805dbc907fbe8fa19bccdc31d3e2ee6e9e
Version: 34cf1aff169dc6dedad8d79da7bf1b4de2773dbc
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{
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          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c"
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          ],
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          "vendor": "Linux",
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: fix integer overflow in fbcon_do_set_font\n\nFix integer overflow vulnerabilities in fbcon_do_set_font() where font\nsize calculations could overflow when handling user-controlled font\nparameters.\n\nThe vulnerabilities occur when:\n1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount\n   multiplication with user-controlled values that can overflow.\n2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow\n3. This results in smaller allocations than expected, leading to buffer\n   overflows during font data copying.\n\nAdd explicit overflow checking using check_mul_overflow() and\ncheck_add_overflow() kernel helpers to safety validate all size\ncalculations before allocation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-15T07:55:51.554Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe"
        }
      ],
      "title": "fbcon: fix integer overflow in fbcon_do_set_font",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39967",
    "datePublished": "2025-10-15T07:55:51.554Z",
    "dateReserved": "2025-04-16T07:20:57.149Z",
    "dateUpdated": "2025-10-15T07:55:51.554Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39967\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-15T08:15:34.210\",\"lastModified\":\"2025-10-16T15:29:11.563\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbcon: fix integer overflow in fbcon_do_set_font\\n\\nFix integer overflow vulnerabilities in fbcon_do_set_font() where font\\nsize calculations could overflow when handling user-controlled font\\nparameters.\\n\\nThe vulnerabilities occur when:\\n1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount\\n   multiplication with user-controlled values that can overflow.\\n2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow\\n3. This results in smaller allocations than expected, leading to buffer\\n   overflows during font data copying.\\n\\nAdd explicit overflow checking using check_mul_overflow() and\\ncheck_add_overflow() kernel helpers to safety validate all size\\ncalculations before allocation.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a4bac869560f943edbe3c2b032062f6673b13d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/994bdc2d23c79087fbf7dcd9544454e8ebcef877\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c8ec14075c5317edd6b242f1be8167aa1e4e333\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6eb9f423b3db000aaedf83367b8539f6b72dcfc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/adac90bb1aaf45ca66f9db8ac100be16750ace78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b8a6e85328aeb9881531dbe89bcd2637a06c3c95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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