CVE-2026-53403
Vulnerability Scoring
Analysis In Progress
CVE-2026-53403 Vulnerability Analysis & Exploit Details
CVE-2026-53403
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-53403 Details
Status: Received on 19 Jul 2026, 12:16 UTC
Last updated: 🕖 20 Jul 2026, 07:16 UTC
Originally published on: 🕛 19 Jul 2026, 12:16 UTC
CVSS Release:
CVE-2026-53403 Vulnerability Summary
CVE-2026-53403: 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.
Assessing the Risk of CVE-2026-53403
Access Complexity Graph
The exploitability of CVE-2026-53403 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-53403
No exploitability data is available for CVE-2026-53403.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-53403, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-53403, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-53403 does not compromise confidentiality.
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Integrity:
None
CVE-2026-53403 does not impact data integrity.
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Availability:
None
CVE-2026-53403 does not affect system availability.
CVE-2026-53403 References
External References
- 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
CWE Common Weakness Enumeration
Unknown
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