CVE-2023-52800

What it actually does

Missing RCU read-side critical section around ath11k_mac_get_ar_by_pdev_id() call in htt pktlog handling allows potential use-after-free of RCU-protected active pdevs in the ath11k Wi-Fi driver.

Why it matters to the business

Kernel instability, crashes, or local privilege escalation risks on Linux systems using Qualcomm ath11k wireless hardware, increasing downtime and security exposure in enterprise and embedded environments until patched.

How an attack unfolds

An attacker with local access triggers concurrent pdev removal and pktlog operations to race the unprotected RCU lookup, causing a use-after-free that can be leveraged for memory corruption; listed threat actors in 2024 campaigns targeting Linux kernel flaws could adapt similar techniques though no public exploit exists for this issue.

How to fix it

Apply the upstream fix by updating to the Linux kernel commit 03ed26935bebf6b6fd8a656490bf3dcc71b72679 or later stable releases containing it; rebuild and deploy updated kernel packages across affected systems.

How to confirm the fix worked

Inspect ath11k htt pktlog source for addition of rcu_read_lock/unlock around ath11k_mac_get_ar_by_pdev_id(); verify running kernel includes the referenced commit hash via uname or kernel build info.

Typical attack path

1. Obtain local code execution on target Linux system with ath11k Wi-Fi enabled
2. Load or trigger ath11k module and initiate pktlog handling
3. Concurrently perform pdev attach/detach operations under RCU protection
4. Exploit resulting use-after-free for memory corruption or denial of service

How to detect it

Search kernel logs and crash dumps for ath11k-related oops, warnings, or use-after-free traces involving htt pktlog or pdev lookup functions; correlate with wireless interface attach/detach events.

What your security team should do

• Immediately upgrade all ath11k-based Linux systems to kernels containing commit 03ed26935bebf6b6fd8a656490bf3dcc71b72679
• Prioritize patching in wireless-enabled servers, laptops, and embedded devices due to potential local exploitation
• Monitor vendor kernel updates and test in staging before broad deployment
• Review wireless driver usage and consider disabling pktlog features if patching is delayed