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.
References
Configurations
Configuration 1 (hide)
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History
30 Jul 2026, 17:41
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| References | () https://git.kernel.org/stable/c/0d8c7f21ad8529d5c181e61f86be35b887ae2e4d - Patch | |
| References | () https://git.kernel.org/stable/c/1458a4d804550b7101e8bb02c1cb941088e4c0c7 - Patch | |
| References | () https://git.kernel.org/stable/c/4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e - Patch | |
| References | () https://git.kernel.org/stable/c/7640b4f68acb54c2c4f6b4a8aee0e9849dacd929 - Patch | |
| References | () https://git.kernel.org/stable/c/7f08fc10fa3d3366dc3af723970bd03d7d6d10e3 - Patch | |
| References | () https://git.kernel.org/stable/c/8707f02ac9f5f632039b60df2c9f3dc914709f72 - Patch | |
| References | () https://git.kernel.org/stable/c/88913059c77e171f44ba829282d42dde0d458811 - Patch | |
| References | () https://git.kernel.org/stable/c/eea16b6f805c0b1fb2f72f0f771088ea45356956 - Patch |
19 Jul 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-19 12:16
Updated : 2026-07-30 17:41
NVD link : CVE-2026-53403
Mitre link : CVE-2026-53403
CVE.ORG link : CVE-2026-53403
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference