CVE-2022-2964

What it actually does

The flaw triggers multiple out-of-bounds reads and possible out-of-bounds writes inside the ASIX AX88179/178A USB Ethernet driver, allowing memory corruption from within the kernel address space.

Why it matters to the business

Systems that rely on the affected USB Ethernet adapters face elevated risk of local privilege escalation, kernel crashes, or arbitrary code execution; older Linux distributions and downstream appliances remain exposed for extended periods because patches were not uniformly backported.

How an attack unfolds

An attacker with local access connects a malicious or specially crafted USB Ethernet device (or emulates one) that triggers the driver to perform reads and writes beyond allocated buffers, corrupting kernel memory structures and ultimately executing code with kernel privileges.

How to fix it

Upgrade the Linux kernel to a version that contains the corrected driver; if no fixed package is yet available for a given distribution, disable the ax88179_178a module or restrict physical USB access until a patched kernel can be installed.

How to confirm the fix worked

Confirm the running kernel version contains the upstream fix for the out-of-bounds conditions, verify that the ax88179_178a module is either absent or reports the corrected version string, and test that attaching compliant AX88179/178A hardware no longer produces kernel oops or memory corruption warnings.

Typical attack path

1. Obtain local user access on the target system
2. Attach or emulate a malicious AX88179/178A USB Ethernet device
3. Trigger the vulnerable packet-processing paths in the ax88179_178a driver
4. Exploit the resulting memory corruption to escalate privileges or crash the kernel

How to detect it

Search kernel logs (dmesg, /var/log/kern.log, journalctl) for ax88179_178a, ax88179, or ax178a strings accompanied by oops, BUG, or slab-out-of-bounds messages; inspect USB device enumeration events around the time of any unexpected privilege changes or reboots.

• ax88179_178a.*out-of-bounds
• ax88179.*slab corruption
• kernel BUG at drivers/net/usb/ax88179_178a.c

What your security team should do

• Prioritize kernel updates on all systems that expose the ax88179_178a driver
• Inventory hardware using ASIX AX88179/178A chipsets and apply vendor firmware or driver patches where supplied
• Restrict local USB device attachment through policy or hardware controls until patches are deployed
• Monitor kernel logs for ax88179_178a related oops or slab corruption messages