CVE-2024-50180

What it actually does

Buffer overflow in sisfb driver when sprintf writes xres/yres values (parsed from strbuf1) into undersized 16-byte strbuf array, exceeding bounds on non-digit input.

Why it matters to the business

Legacy Linux systems using SiS framebuffer hardware face kernel instability or code execution risks; high downstream dependents amplify exposure across distributions, with urgency from active 2024 exploitation campaigns by espionage and financially motivated actors.

How an attack unfolds

Attacker supplies crafted resolution strings containing non-digits to strbuf1, triggering oversized sprintf write during mode set; similar Linux kernel out-of-bounds write flaws have been leveraged in 2024 zero-day campaigns by espionage and financially motivated actors.

How to fix it

Upgrade Linux kernel to version increasing strbuf to 24 bytes; apply listed fixes for affected packages including firefox (Ubuntu:14.04:LTS) at 42.0+build2-0ubuntu0.14.04.1.

How to confirm the fix worked

Confirm kernel source contains enlarged strbuf array and recompile; test with inputs containing mixed digit/space characters in resolution strings.

Typical attack path

1. Locate systems exposing sisfb framebuffer interface
2. Supply malicious xres/yres data via userspace ioctl or config
3. Trigger sprintf overflow to corrupt adjacent kernel memory
4. Achieve denial of service or escalate to arbitrary code execution

How to detect it

Review kernel logs for sisfb sprintf-related panics or oops involving strbuf; correlate with process activity triggering framebuffer changes in environments targeted by listed threat actors.

What your security team should do

• Prioritize kernel updates on all systems using sisfb driver given 2024 exploitation campaigns
• Audit legacy hardware for SiS framebuffer usage and migrate where possible
• Monitor EPSS and KEV updates for rising exploit maturity