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CVE-2026-46191: fbcon: Avoid OOB font access if console rotation fails

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-10-15
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: fbcon: Avoid OOB font access if console rotation fails Clear the font buffer if the reallocation during console rotation fails in fbcon_rotate_font(). The putcs implementations for the rotated buffer will return early in this case. See [1] for an example. Currently, fbcon_rotate_font() keeps the old buffer, which is too small for the rotated font. Printing to the rotated console with a high-enough character code will overflow the font buffer. v2: - fix typos in commit message

Affected products

• Linux kernel: from 2.6.15 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.7 — fixed in 6.12.90, 6.18.32, 6.6.140, 7.0.7

How to fix

Upgrade to a fixed version: Linux kernel 6.12.90, 6.18.32, 6.6.140, 7.0.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/46cf3646dea54baeaa2eafe3fb1ba769947f31b0
• https://git.kernel.org/stable/c/524a6079395916fb3d790ef2bb46a1d2939b27dd
• https://git.kernel.org/stable/c/594973a2e54924d8ba31c9faac669fc1ba6fcb80
• https://git.kernel.org/stable/c/7105d9f1387d63b15c9a860674fc92c959181f2f
• https://git.kernel.org/stable/c/ab6c34b9829d5de03f1d08a47a2253729a6e7e27
• https://git.kernel.org/stable/c/b44cc78ff46b96e72d333a3be6aaaa0a14797263
• https://git.kernel.org/stable/c/b51c343a81e6e806525a4435e22532c107dd7e9d
• https://git.kernel.org/stable/c/e4ef723d8975a2694cc90733a6b888a5e2841842
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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