fbdev: vfb: defer cleanup until the last reference

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97604
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:14 UTC
Updated2026-09-25 11:17:14 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a 86356f13598f59f5acb1754895747dcdaf65a254 git Not specified
CNA Linux Linux affected 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a 5ff1effb047e465cde193d7df95988aa1520035e git Not specified
CNA Linux Linux affected 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a 3c91e51a53cf805e551e5dc8149cd0539a6dbb9d git Not specified
CNA Linux Linux affected 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a a0a34a40ed299c9c7cff6af163a5b883ee9d6d73 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5ff1effb047e465cde193d7df95988aa1520035e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c91e51a53cf805e551e5dc8149cd0539a6dbb9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86356f13598f59f5acb1754895747dcdaf65a254 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0a34a40ed299c9c7cff6af163a5b883ee9d6d73 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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