CVE-2023-52827

What it actually does

Missing validation on length extracted from HTT messages and ppdu_stats.common.num_users allows out-of-bounds reads during message iteration and parsing in the ath12k driver.

Why it matters to the business

Local processes on affected Linux systems can trigger crashes or leak kernel memory contents, potentially exposing sensitive data or causing wireless subsystem instability.

How an attack unfolds

An attacker with local access crafts or intercepts HTT messages containing unexpected length values, bypassing the absent bounds checks in ath12k_htt_pull_ppdu_stats to read beyond allocated buffers.

How to fix it

Apply the upstream fix by updating the Linux kernel to commit 79527c21a3ce04cffc35ea54f74ee087e532be57 or later stable release containing the validation checks for len and num_users.

How to confirm the fix worked

Confirm the presence of the bounds checks on len and num_users in ath12k_htt_pull_ppdu_stats after applying the patch; verify the running kernel contains commit 79527c21a3ce04cffc35ea54f74ee087e532be57 via git log or kernel version string.

Typical attack path

1. Obtain local code execution or user privileges on a Linux host with ath12k Wi-Fi hardware
2. Trigger or inject malformed HTT PPDU stats messages into the driver path
3. Read kernel memory beyond intended bounds or induce a denial-of-service crash

How to detect it

Review kernel logs for ath12k driver oops or warnings around PPDU stats handling; correlate with unexpected process activity attempting to interact with wireless interfaces.

What your security team should do

• Prioritize kernel updates on all systems using ath12k hardware
• Monitor vendor backports for distribution-specific packages
• Restrict local user access on multi-tenant systems until patched