CVE-2026-80785 (GCVE-0-2026-80785)
Vulnerability from cvelistv5
Published
2026-09-04 15:12
Modified
2026-09-07 14:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: serialize mode sysfs access with lock_fb_info() show_mode(), show_modes(), and store_mode() access fb_info->modelist and fb_info->mode without holding lock_fb_info(). store_modes() takes lock_fb_info() while replacing the modelist and freeing the old one. A concurrent reader or writer can load a pointer to an old modelist entry before store_modes() frees it, then dereference freed memory or store a stale freed pointer in fb_info->mode. Take lock_fb_info() in show_mode(), show_modes(), and store_mode() to serialize with store_modes(). In show_mode(), copy the mode to the stack and format after dropping the lock. In store_mode(), split activate() into a _locked variant to avoid double-locking, and hold the locks for the modelist walk, mode conversion, activation, and fb_info->mode assignment together.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbsysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "26135631ed8e487bc6aef70cc41934e258d09bbe",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "061db6b7a910b8378f3b2df64f8c0a3ddc6e85f2",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbsysfs.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.12"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.11",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
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                  "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\nfbdev: serialize mode sysfs access with lock_fb_info()\n\nshow_mode(), show_modes(), and store_mode() access fb_info-\u003emodelist\nand fb_info-\u003emode without holding lock_fb_info(). store_modes() takes\nlock_fb_info() while replacing the modelist and freeing the old one.\n\nA concurrent reader or writer can load a pointer to an old modelist\nentry before store_modes() frees it, then dereference freed memory or\nstore a stale freed pointer in fb_info-\u003emode.\n\nTake lock_fb_info() in show_mode(), show_modes(), and store_mode() to\nserialize with store_modes(). In show_mode(), copy the mode to the\nstack and format after dropping the lock. In store_mode(), split\nactivate() into a _locked variant to avoid double-locking, and hold\nthe locks for the modelist walk, mode conversion, activation, and\nfb_info-\u003emode assignment together."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-07T14:21:08.600Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/26135631ed8e487bc6aef70cc41934e258d09bbe"
        },
        {
          "url": "https://git.kernel.org/stable/c/061db6b7a910b8378f3b2df64f8c0a3ddc6e85f2"
        }
      ],
      "title": "fbdev: serialize mode sysfs access with lock_fb_info()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80785",
    "datePublished": "2026-09-04T15:12:57.076Z",
    "dateReserved": "2026-08-26T14:34:25.793Z",
    "dateUpdated": "2026-09-07T14:21:08.600Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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