CVE-2024-27065

What it actually does

The nf_tables implementation skips proper internal flag comparison on table updates, allowing transactions that modify flags without triggering expected authorization checks.

Why it matters to the business

Local users on affected Linux kernels and Debian packages can bypass intended table update restrictions, potentially leading to unauthorized network configuration changes; low urgency given flat EPSS, no KEV listing, and no ransomware use, though widespread kernel prevalence increases exposure across many systems.

How an attack unfolds

An attacker with local access crafts a table update that avoids flag comparison logic, enabling unauthorized modifications; listed threat actor context around Android kernel remote code execution highlights potential for escalated local abuse in kernel environments.

How to fix it

Upgrade Linux kernel to fixed version 5.4.273 or commit 845083249d6a392f3a88804e1669bdb936ee129f; for libvorbis and libvorbisidec on Debian 11-14 apply the listed fixed packages such as 1.2.0.dfsg-1 or 1.0.2+svn16259-2.

How to confirm the fix worked

Verify running kernel version against 5.4.273 or later, confirm package versions match fixed Debian entries, and test that table updates without flag changes are skipped as intended.

Typical attack path

1. Obtain local user access on an affected Linux system
2. Interact with nf_tables subsystem to issue table update operations
3. Supply crafted updates that bypass internal flag checks
4. Achieve unauthorized table state changes leading to privilege escalation or policy bypass

How to detect it

Review kernel and netfilter logs for unexpected table update transactions; correlate with the listed Android kernel remote code execution threat actor patterns if observed in Android-derived environments.

What your security team should do

• Prioritize kernel upgrades on all production systems to 5.4.273 or equivalent fixed commit
• Audit Debian package versions for libvorbis and libvorbisidec and apply listed fixes immediately
• Monitor EPSS trend and re-evaluate if exploit maturity changes given 896 days since publication