CVE-2026-53403fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 1458a4d804550b7101e8bb02c1cb941088e4c0c7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8707f02ac9f5f632039b60df2c9f3dc914709f72; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 0d8c7f21ad8529d5c181e61f86be35b887ae2e4d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7640b4f68acb54c2c4f6b4a8aee0e9849dacd929; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before eea16b6f805c0b1fb2f72f0f771088ea45356956; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 88913059c77e171f44ba829282d42dde0d458811; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7f08fc10fa3d3366dc3af723970bd03d7d6d10e3 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.12.1 before 5.10.260; from 5.11 before 5.15.211; from 5.16 before 6.1.177; from 6.2 before 6.6.144; from 6.7 before 6.12.95; from 6.13 before 6.18.38; from 6.19 before 7.1.3; 2.6.12; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/1458a4d804550b7101e8bb02c1cb941088e4c0c7patch
- https://git.kernel.org/stable/c/8707f02ac9f5f632039b60df2c9f3dc914709f72patch
- https://git.kernel.org/stable/c/0d8c7f21ad8529d5c181e61f86be35b887ae2e4dpatch
- https://git.kernel.org/stable/c/7640b4f68acb54c2c4f6b4a8aee0e9849dacd929patch
- https://git.kernel.org/stable/c/4f1a7fe8ba845cb7d39580755f78c3b7b9a0b61epatch
- https://git.kernel.org/stable/c/eea16b6f805c0b1fb2f72f0f771088ea45356956patch
- https://git.kernel.org/stable/c/88913059c77e171f44ba829282d42dde0d458811patch
- https://git.kernel.org/stable/c/7f08fc10fa3d3366dc3af723970bd03d7d6d10e3patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.