{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80579",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80579"
  ],
  "published": "2026-08-26T14:37:59Z",
  "summary": "fbdev: clear fb_info->mode before deleting a videomode",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: clear fb_info->mode before deleting a videomode\n\nfb_set_var() can delete a mode from info->modelist when userspace\npasses FB_ACTIVATE_INV_MODE through FBIOPUT_VSCREENINFO. The code\nchecks that the mode being deleted is not the current info->var and\nthat fbcon is not using it, but it does not check fb_info->mode.\n\nfb_info->mode may still point into the modelist entry being deleted.\nIf the entry is freed, later mode sysfs reads through show_mode() can\ndereference a stale pointer.\n\nClear fb_info->mode before calling fb_delete_videomode() when it\nmatches the mode being removed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80579"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce7fef961c63229b22dec415fb988899f479d61f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/95e647d2a5304a8fd11f1ba3c8502de700650131"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T05:18:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through local framebuffer interfaces\u2014FBIOPUT_VSCREENINFO ioctl on /dev/fb* to delete a videomode and sysfs reads of /sys/class/graphics/fb*/mode via show_mode(); fbdev core has no network, Bluetooth, or remote packet path.\nAC:L - Exploitation is a deterministic state bug, not a race: ioctl with FB_ACTIVATE_INV_MODE frees the modelist kmalloc entry while fb_info->mode still points into it, and a subsequent sysfs mode read reliably dereferences the stale pointer without attacker-uncontrollable timing.\nPR:L - The freeing trigger is FBIOPUT_VSCREENINFO on /dev/fb*, which requires only local framebuffer device access (video group or kiosk/embedded/HMI service accounts), not init-namespace root; sysfs mode reads are world-readable and complete the UAF disclosure path.\nUI:N - No victim interaction is required; the attacker performs ioctl mode deletion and sysfs mode reads through their own local process without needing another user to mount, open, or configure unrelated resources.\nS:U - The use-after-free corrupts kernel heap state within the local fbdev subsystem and does not cross VM, container, or IOMMU boundaries to impact resources under a different security authority.\nC:H - After fb_delete_videomode() kfree()s the fb_modelist object, show_mode()/mode_string() reads flag, vmode, xres, yres, and refresh from freed slab memory and copies attacker-influenced bytes to userspace\u2014a UAF information-disclosure primitive.\nI:H - The dangling fb_info->mode pointer into a freed kmalloc object enables classic heap grooming between ioctl free and sysfs read; reallocated slab contents can be corrupted or confused for control-flow or arbitrary-write primitives beyond the immediate read.\nA:H - Dereferencing the freed fb_videomode structure causes KASAN-detectable use-after-free faults and kernel oops/panic on display-equipped embedded, automotive, kiosk, and console systems running the framebuffer subsystem."
    }
  }
}