CVE-2024-50289

What it actually does

Potential Spectre vulnerability in dvb_ca_ioctl allowing speculative access to av7110->ci_slot array, enabling side-channel information disclosure of kernel memory.

Why it matters to the business

Attackers could leak sensitive kernel data on affected Linux systems handling DVB/media devices, increasing risk of credential or secret exposure; low exploitability but requires prompt patching on legacy Ubuntu setups with high downstream kernel usage.

How an attack unfolds

An attacker with local access supplies crafted parameters to the CA ioctl handler, triggering speculative execution that reads beyond intended ci_slot bounds and leaks data via cache side channels; listed threat actors in 2024 campaigns have targeted similar Linux kernel information disclosure flaws.

How to fix it

Upgrade flashplugin-nonfree on Ubuntu 14.04 LTS to version 11.2.202.554ubuntu0.14.04.1; apply equivalent kernel patches addressing the av7110 Spectre issue in staging drivers.

How to confirm the fix worked

Confirm package version matches 11.2.202.554ubuntu0.14.04.1 or later; verify kernel source no longer contains the warned spectre access in av7110_ca.c:270; recompile and test ioctl paths.

Typical attack path

1. Gain local user access on vulnerable Linux kernel system
2. Locate and invoke dvb_ca_ioctl with malicious slot index
3. Measure cache timing to extract speculatively read kernel data
4. Repeat to reconstruct sensitive memory contents

How to detect it

Review kernel logs for unusual av7110 ioctl activity; search process execution history for calls involving dvb_ca; correlate with side-channel monitoring tools on media subsystems.

What your security team should do

• Prioritize upgrade of affected flashplugin-nonfree packages within CISA-style timelines even if not KEV-listed
• Audit systems for legacy av7110 DVB drivers and disable if unused
• Monitor EPSS trend for any increase indicating rising exploit interest
• Apply kernel updates across all downstream dependents