In the Linux kernel, the following vulnerability has been resolved:

fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var

info->var, a framebuffer's current mode, is expected to have a matching
entry in info->modelist. var_to_display() relies on this and treats a
failed fb_match_mode() as "This should not happen". fb_set_var() keeps it
true by adding the mode to the list on every change, and
do_register_framebuffer() does the same at registration.

store_modes() replaces the modelist from userspace. fb_new_modelist()
validates the new modes but does not check that info->var still has a
match. It relies on fbcon_new_modelist() to re-point consoles, but that
only handles consoles mapped to the framebuffer. With fbcon unbound there
are none, so info->var is left describing a mode that is no longer in the
list.

A later console takeover runs var_to_display(), where fb_match_mode()
returns NULL and leaves fb_display[i].mode NULL. fbcon_switch() passes it
to display_to_var(), and fb_videomode_to_var() dereferences the NULL mode.

Keep the current mode in the list in fb_new_modelist(), the same way
fb_set_var() does.

https://git.kernel.org/stable/c/0d8c7f21ad8529d5c181e61f86be35b887ae2e4d

https://git.kernel.org/stable/c/1458a4d804550b7101e8bb02c1cb941088e4c0c7

https://git.kernel.org/stable/c/4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e

https://git.kernel.org/stable/c/7640b4f68acb54c2c4f6b4a8aee0e9849dacd929

https://git.kernel.org/stable/c/7f08fc10fa3d3366dc3af723970bd03d7d6d10e3

https://git.kernel.org/stable/c/8707f02ac9f5f632039b60df2c9f3dc914709f72

https://git.kernel.org/stable/c/88913059c77e171f44ba829282d42dde0d458811

https://git.kernel.org/stable/c/eea16b6f805c0b1fb2f72f0f771088ea45356956

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["drivers/video/fbdev/core/fbmem.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"1458a4d804550b7101e8bb02c1cb941088e4c0c7","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"8707f02ac9f5f632039b60df2c9f3dc914709f72","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"0d8c7f21ad8529d5c181e61f86be35b887ae2e4d","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"7640b4f68acb54c2c4f6b4a8aee0e9849dacd929","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"eea16b6f805c0b1fb2f72f0f771088ea45356956","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"88913059c77e171f44ba829282d42dde0d458811","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"7f08fc10fa3d3366dc3af723970bd03d7d6d10e3","versionType":"git","status":"affected"},{"version":"0","lessThan":"5.10.260","versionType":"semver","status":"affected"},{"version":"0","lessThan":"5.15.211","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.1.177","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.6.144","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.12.95","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.18.38","versionType":"semver","status":"affected"},{"version":"0","lessThan":"7.1.3","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["drivers/video/fbdev/core/fbmem.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"5.10.260","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.211","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.177","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.144","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.95","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.38","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.3","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]