{
  "cveId": "CVE-2022-49978",
  "url": "https://patchblox.com/security/cve/CVE-2022-49978",
  "summary": "CVE-2022-49978 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49978, released June 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  fbdev: fb_pm2fb: Avoid potential divide by zero...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fbdev: fb_pm2fb: Avoid potential divide by zero error  In \u0060do_fb_ioctl()\u0060 of fbmem.c, if cmd is FBIOPUT_VSCREENINFO, var will be copied from user, then go through \u0060fb_set_var()\u0060 and \u0060info-\u003Efbops-\u003Efb_check_var()\u0060 which could may be \u0060pm2fb_check_var()\u0060. Along the path, \u0060var-\u003Epixclock\u0060 won\u0027t be modified. This function checks whether reciprocal of \u0060var-\u003Epixclock\u0060 is too high. If \u0060var-\u003Epixclock\u0060 is zero, there will be a divide by zero error. So, it is necessary to check whether denominator is zero to avoid crash. As this bug is found by Syzkaller, logs are listed below.  divide error in pm2fb_check_var Call Trace:  \u003CTASK\u003E  fb_set_var\u002B0x367/0xeb0 drivers/video/fbdev/core/fbmem.c:1015  do_fb_ioctl\u002B0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110  fb_ioctl\u002B0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189",
  "published": "2025-06-18T11:15:25Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00253,
  "epssPercentile": 0.16937,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.0.2-1",
      "fix": "DEBIAN-CVE-2022-49978",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49978",
      "released": "2025-06-18T11:15:25Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.0.2-1",
      "fix": "DEBIAN-CVE-2022-49978",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49978",
      "released": "2025-06-18T11:15:25Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.0.2-1",
      "fix": "DEBIAN-CVE-2022-49978",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49978",
      "released": "2025-06-18T11:15:25Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}