CVE-2026-53403: fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var

criticalCVSS 9.8CVE-2026-53403

CSIRTS triage

vendor: Linux product: fbdevOther

What: A null pointer dereference can occur in fb_videomode_to_var due to an issue in fb_new_modelist.
Who is affected: Deployments using fbdev for framebuffer device management.
Urgency: Remediation is necessary as the severity is unknown and exploitation is not confirmed.
Action: Apply the patch for CVE-2026-53403.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch fbdev

Get an email when a new fbdev advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53403

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-534030.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53403	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for fbdev

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-64245: In the Linux kernel, the following vulnerability has been resolved: fbdev: modedb: fix a possi…nvd · 2026-07-24
unknownCVE-2026-63826: In the Linux kernel, the following vulnerability has been resolved: fbdev: fix use-after-free …nvd · 2026-07-19
unknownCVE-2026-53403: In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix fb_new_modelist…nvd · 2026-07-19
highCVE-2026-53402: In the Linux kernel, the following vulnerability has been resolved: fbdev: fbcon: fix out-of-b…nvd · 2026-07-19
highCVE-2026-53401: In the Linux kernel, the following vulnerability has been resolved: fbdev: omap2: fix use-afte…nvd · 2026-07-19
highCVE-2026-53401: fbdev: omap2: fix use-after-free in omapfb_mmapmsrc · 2026-07-14