CVE-2026-97604

CVE CVE-2026-97604EUVD EUVD-2026-86735Published 2026-09-25T10:22:16.000Z

What the advisory describes

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->cmap and performs the usercopy after dropping info->lock. 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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 2.6.30; patch: 6.12.111; patch: 7.2.7; patch: 0; patch: 6.18.53; 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a <a0a34a40ed299c9c7cff6af163a5b883ee9d6d73; patch: 7.3-rc3; 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a <5ff1effb047e465cde193d7df95988aa1520035e; 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a <3c91e51a53cf805e551e5dc8149cd0539a6dbb9d; 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a <86356f13598f59f5acb1754895747dcdaf65a254

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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