What’s Vulnerable › Vulnerabilities

CVE-2023-3161

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-12 · updated 2026-06-17
• Weakness: CWE-1335

Description

A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel. When providing font->width and font->height greater than 32 to fbcon_set_font, since there are no checks in place, a shift-out-of-bounds occurs leading to undefined behavior and possible denial of service.

Affected products

• Fedoraproject Fedora: 38
• Linux kernel: before 6.2; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4, 6.2-rc5, 6.2-rc6 — fixed in 6.2
• Red Hat Enterprise Linux: 8.0, 9.0

How to fix

Upgrade to a fixed version: Linux kernel 6.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2213485
• https://github.com/torvalds/linux/commit/2b09d5d364986f724f17001ccfe4126b9b43a0be
• https://bugzilla.redhat.com/show_bug.cgi?id=2213485
• https://github.com/torvalds/linux/commit/2b09d5d364986f724f17001ccfe4126b9b43a0be

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