CVE-2024-47698

What it actually does

Out-of-bounds write in rtl2832_pid_filter caused by boundary check allowing index value of 32 on a 32-bit filters field, enabling access beyond allocated bits via set_bit/clear_bit.

Why it matters to the business

Local attackers on affected Linux systems can trigger crashes or memory corruption leading to denial of service or potential privilege escalation; low exploitability but high severity on media/DVB hardware configurations.

How an attack unfolds

A local attacker supplies a crafted PID filter index reaching 32 to the driver, bypassing the flawed check and writing outside the intended bit range; listed threat actors have targeted similar kernel OOB write issues in espionage and financial campaigns.

How to fix it

Apply kernel patches that change the boundary check from index > 32 to index >= 32; for listed langchain-experimental packages upgrade to version 0.0.21 where applicable.

How to confirm the fix worked

Confirm updated kernel source contains the corrected boundary check; test with index values 31 and 32 to ensure no OOB access occurs.

Typical attack path

1. Obtain local user access on target Linux system with DVB frontend hardware
2. Invoke rtl2832_pid_filter with index >= 32
3. Trigger set_bit or clear_bit on invalid position causing OOB memory write
4. Leverage corruption for crash or escalation

How to detect it

Review kernel logs and audit trails for OOB access patterns around media drivers; correlate with process activity invoking DVB frontends; threat actor mentions indicate possible overlap with known Linux kernel exploitation campaigns.

What your security team should do

• Prioritize patching systems exposing DVB/media drivers due to high CVSS
• Monitor EPSS trend stability and absence from KEV for risk acceptance decisions
• Audit local applications for direct calls to affected filter functions