CVE-2025-38198 (GCVE-0-2025-38198)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2025-07-28 04:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: Make sure modelist not set on unregistered console It looks like attempting to write to the "store_modes" sysfs node will run afoul of unregistered consoles: UBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28 index -1 is out of range for type 'fb_info *[32]' ... fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122 fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048 fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673 store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113 dev_attr_store+0x55/0x80 drivers/base/core.c:2439 static struct fb_info *fbcon_registered_fb[FB_MAX]; ... static signed char con2fb_map[MAX_NR_CONSOLES]; ... static struct fb_info *fbcon_info_from_console(int console) ... return fbcon_registered_fb[con2fb_map[console]]; If con2fb_map contains a -1 things go wrong here. Instead, return NULL, as callers of fbcon_info_from_console() are trying to compare against existing "info" pointers, so error handling should kick in correctly.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.142",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.95",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "versionEndExcluding": "6.1.142",
                  "vulnerable": true
                },
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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\nfbcon: Make sure modelist not set on unregistered console\n\nIt looks like attempting to write to the \"store_modes\" sysfs node will\nrun afoul of unregistered consoles:\n\nUBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28\nindex -1 is out of range for type \u0027fb_info *[32]\u0027\n...\n fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122\n fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048\n fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673\n store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113\n dev_attr_store+0x55/0x80 drivers/base/core.c:2439\n\nstatic struct fb_info *fbcon_registered_fb[FB_MAX];\n...\nstatic signed char con2fb_map[MAX_NR_CONSOLES];\n...\nstatic struct fb_info *fbcon_info_from_console(int console)\n...\n        return fbcon_registered_fb[con2fb_map[console]];\n\nIf con2fb_map contains a -1 things go wrong here. Instead, return NULL,\nas callers of fbcon_info_from_console() are trying to compare against\nexisting \"info\" pointers, so error handling should kick in correctly."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:14:52.439Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b3237d451bf3a4490cb1a76f3b7c91d9888f1c4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/519ba75728ee8cd561dce25fc52a2ec5c47171dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/f28f1f578cd810779d01999c60618cda14c281dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/54b28f7c567dd659e5f9562f518e4d7f3f6a367b"
        },
        {
          "url": "https://git.kernel.org/stable/c/cedc1b63394a866bf8663a3e40f4546f1d28c8d8"
        }
      ],
      "title": "fbcon: Make sure modelist not set on unregistered console",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38198",
    "datePublished": "2025-07-04T13:37:20.588Z",
    "dateReserved": "2025-04-16T04:51:23.993Z",
    "dateUpdated": "2025-07-28T04:14:52.439Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38198\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T14:15:27.040\",\"lastModified\":\"2025-07-08T16:18:53.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbcon: Make sure modelist not set on unregistered console\\n\\nIt looks like attempting to write to the \\\"store_modes\\\" sysfs node will\\nrun afoul of unregistered consoles:\\n\\nUBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28\\nindex -1 is out of range for type \u0027fb_info *[32]\u0027\\n...\\n fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122\\n fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048\\n fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673\\n store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113\\n dev_attr_store+0x55/0x80 drivers/base/core.c:2439\\n\\nstatic struct fb_info *fbcon_registered_fb[FB_MAX];\\n...\\nstatic signed char con2fb_map[MAX_NR_CONSOLES];\\n...\\nstatic struct fb_info *fbcon_info_from_console(int console)\\n...\\n        return fbcon_registered_fb[con2fb_map[console]];\\n\\nIf con2fb_map contains a -1 things go wrong here. Instead, return NULL,\\nas callers of fbcon_info_from_console() are trying to compare against\\nexisting \\\"info\\\" pointers, so error handling should kick in correctly.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbcon: Aseg\u00farese de que modelist no est\u00e9 configurado en una consola no registrada Parece que intentar escribir en el nodo sysfs \\\"store_modes\\\" entrar\u00e1 en conflicto con las consolas no registradas: UBSAN: array-index-out-of-bounds in drivers/video/fbdev/core/fbcon.c:122:28 index -1 is out of range for type \u0027fb_info *[32]\u0027 ... fbcon_info_from_console+0x192/0x1a0 drivers/video/fbdev/core/fbcon.c:122 fbcon_new_modelist+0xbf/0x2d0 drivers/video/fbdev/core/fbcon.c:3048 fb_new_modelist+0x328/0x440 drivers/video/fbdev/core/fbmem.c:673 store_modes+0x1c9/0x3e0 drivers/video/fbdev/core/fbsysfs.c:113 dev_attr_store+0x55/0x80 drivers/base/core.c:2439 static struct fb_info *fbcon_registered_fb[FB_MAX]; ... static signed char con2fb_map[MAX_NR_CONSOLES]; ... static struct fb_info *fbcon_info_from_console(int console) ... return fbcon_registered_fb[con2fb_map[console]]; Si con2fb_map contiene un valor de -1, la situaci\u00f3n podr\u00eda fallar. En su lugar, se devuelve NULL, ya que quienes llaman a fbcon_info_from_console() intentan comparar con punteros \\\"info\\\" existentes, por lo que la gesti\u00f3n de errores deber\u00eda funcionar correctamente.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/519ba75728ee8cd561dce25fc52a2ec5c47171dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54b28f7c567dd659e5f9562f518e4d7f3f6a367b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3237d451bf3a4490cb1a76f3b7c91d9888f1c4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cedc1b63394a866bf8663a3e40f4546f1d28c8d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f28f1f578cd810779d01999c60618cda14c281dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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