{"id":"CVE-2026-97604","state":"PUBLISHED","title":"fbdev: vfb: defer cleanup until the last reference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: vfb: defer cleanup until the last reference\n\nFBIOGETCMAP takes a shallow snapshot of info->cmap and performs the\nusercopy after dropping info->lock. vfb_remove() frees the colormap\nimmediately after unregistering the framebuffer, even when an open file\nstill holds a reference to fb_info. A concurrent driver unbind can\ntherefore free the colormap while the ioctl copies it to userspace.\n\nKASAN reports:\n\n  BUG: KASAN: slab-use-after-free in _copy_to_user\n  Read of size 512 by task poc/125\n\n   _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24)\n   fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211)\n   do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114)\n\n   Allocated by task 1:\n   fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108)\n   vfb_probe (drivers/video/fbdev/vfb.c:459)\n\n   Freed by task 124:\n   fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151)\n   vfb_remove (drivers/video/fbdev/vfb.c:489)\n\nunregister_framebuffer() drops the registration reference, and fbdev calls\nfb_destroy after the last put_fb_info(). Move the registered framebuffer's\ncleanup into an fb_destroy callback so its colormap and screen buffer stay\nalive until all file references have been released.","publishedAt":"2026-09-25T10:22:16.613Z","updatedAt":"2026-10-19T09:10:08.190Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"bf49eac7ed11aabd0b9b790c062742a8e4be97c6","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"040ce3950f64a11e9ee5646c8aaa91fd2e29e245","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"ab664e279eb2a68e55895dd115a9488807280f07","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"de5a0eda59fe4b3eacd1a67c992e54766bb6683f","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"86356f13598f59f5acb1754895747dcdaf65a254","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"5ff1effb047e465cde193d7df95988aa1520035e","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"3c91e51a53cf805e551e5dc8149cd0539a6dbb9d","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"a0a34a40ed299c9c7cff6af163a5b883ee9d6d73","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/vfb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/vfb.c"]}],"references":["https://git.kernel.org/stable/c/bf49eac7ed11aabd0b9b790c062742a8e4be97c6","https://git.kernel.org/stable/c/040ce3950f64a11e9ee5646c8aaa91fd2e29e245","https://git.kernel.org/stable/c/ab664e279eb2a68e55895dd115a9488807280f07","https://git.kernel.org/stable/c/de5a0eda59fe4b3eacd1a67c992e54766bb6683f","https://git.kernel.org/stable/c/86356f13598f59f5acb1754895747dcdaf65a254","https://git.kernel.org/stable/c/5ff1effb047e465cde193d7df95988aa1520035e","https://git.kernel.org/stable/c/3c91e51a53cf805e551e5dc8149cd0539a6dbb9d","https://git.kernel.org/stable/c/a0a34a40ed299c9c7cff6af163a5b883ee9d6d73"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97604.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97604","state":"PUBLISHED","datePublished":"2026-09-25T10:22:16.613Z","dateUpdated":"2026-10-19T09:10:08.190Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T16:01:01.158Z"},"containers":{"cna":{"title":"fbdev: vfb: defer cleanup until the last reference","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: vfb: defer cleanup until the last reference\n\nFBIOGETCMAP takes a shallow snapshot of info->cmap and performs the\nusercopy after dropping info->lock. vfb_remove() frees the colormap\nimmediately after unregistering the framebuffer, even when an open file\nstill holds a reference to fb_info. A concurrent driver unbind can\ntherefore free the colormap while the ioctl copies it to userspace.\n\nKASAN reports:\n\n  BUG: KASAN: slab-use-after-free in _copy_to_user\n  Read of size 512 by task poc/125\n\n   _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24)\n   fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211)\n   do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114)\n\n   Allocated by task 1:\n   fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108)\n   vfb_probe (drivers/video/fbdev/vfb.c:459)\n\n   Freed by task 124:\n   fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151)\n   vfb_remove (drivers/video/fbdev/vfb.c:489)\n\nunregister_framebuffer() drops the registration reference, and fbdev calls\nfb_destroy after the last put_fb_info(). Move the registered framebuffer's\ncleanup into an fb_destroy callback so its colormap and screen buffer stay\nalive until all file references have been released."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"bf49eac7ed11aabd0b9b790c062742a8e4be97c6","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"040ce3950f64a11e9ee5646c8aaa91fd2e29e245","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"ab664e279eb2a68e55895dd115a9488807280f07","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"de5a0eda59fe4b3eacd1a67c992e54766bb6683f","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"86356f13598f59f5acb1754895747dcdaf65a254","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"5ff1effb047e465cde193d7df95988aa1520035e","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"3c91e51a53cf805e551e5dc8149cd0539a6dbb9d","versionType":"git"},{"version":"5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a","status":"affected","lessThan":"a0a34a40ed299c9c7cff6af163a5b883ee9d6d73","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/vfb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/vfb.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bf49eac7ed11aabd0b9b790c062742a8e4be97c6"},{"url":"https://git.kernel.org/stable/c/040ce3950f64a11e9ee5646c8aaa91fd2e29e245"},{"url":"https://git.kernel.org/stable/c/ab664e279eb2a68e55895dd115a9488807280f07"},{"url":"https://git.kernel.org/stable/c/de5a0eda59fe4b3eacd1a67c992e54766bb6683f"},{"url":"https://git.kernel.org/stable/c/86356f13598f59f5acb1754895747dcdaf65a254"},{"url":"https://git.kernel.org/stable/c/5ff1effb047e465cde193d7df95988aa1520035e"},{"url":"https://git.kernel.org/stable/c/3c91e51a53cf805e551e5dc8149cd0539a6dbb9d"},{"url":"https://git.kernel.org/stable/c/a0a34a40ed299c9c7cff6af163a5b883ee9d6d73"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:10:08.190Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}