{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  fbdev: vfb: defer cleanup until the last reference  FBIOGETCMAP takes a shallow snapshot of info-\u003ecmap and performs the usercopy after dropping info-\u003elock. vfb_remove() frees the colormap immediately after unregistering the framebuffer, even when an open file still holds a reference to fb_info. A concurrent driver unbind can therefore free the colormap while the ioctl copies it to userspace.  KASAN reports:    BUG: KASAN: slab-use-after-free in _copy_to_user   Read of size 512 by task poc/125     _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24)    fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211)    do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114)     Allocated by task 1:    fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108)    vfb_probe (drivers/video/fbdev/vfb.c:459)     Freed by task 124:    fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151)    vfb_remove (drivers/video/fbdev/vfb.c:489)  unregister_framebuffer() drops the registration reference, and fbdev calls fb_destroy after the last put_fb_info(). Move the registered framebuffer's cleanup into an fb_destroy callback so its colormap and screen buffer stay alive until all file references have been released.",
  "id": "DEBIAN-CVE-2026-97604",
  "modified": "2026-09-26T04:47:39.372970479Z",
  "published": "2026-09-25T11:17:14.407Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-97604"
    }
  ],
  "upstream": [
    "CVE-2026-97604"
  ]
}