CVE-2023-45862

What it actually does

The flaw permits an object in the ENE UB6250 USB storage driver to extend past the end of its allocated buffer, resulting in out-of-bounds memory access and potential corruption within the Linux kernel.

Why it matters to the business

Systems using affected Linux kernels with ENE UB6250 hardware may experience unexpected crashes or loss of USB storage functionality, disrupting operations until the kernel is updated.

How an attack unfolds

An attacker with local access connects a malicious or malformed USB device that exercises the ENE UB6250 driver path, triggering the buffer overrun to corrupt kernel memory and cause denial of service.

How to fix it

Update the Linux kernel to a version containing commit ce33e64c1788912976b61314b56935abd4bc97ef or later; rebuild and deploy the patched kernel across all affected systems.

How to confirm the fix worked

Verify the running kernel version is 6.2.5 or newer, or confirm the presence of commit ce33e64c1788912976b61314b56935abd4bc97ef in the kernel source tree; test USB storage operations with the ENE UB6250 hardware post-update.

Typical attack path

1. Obtain local access to a target Linux system
2. Insert or present a crafted USB storage device recognized by the ENE UB6250 driver
3. Trigger the vulnerable code path in ene_ub6250.c to extend an object beyond its allocation
4. Induce kernel memory corruption leading to crash or instability

How to detect it

Review kernel logs for oops or panic messages referencing ene_ub6250 or usb storage drivers around the time of suspected incidents; examine dmesg output and system crash dumps for allocation-related faults.

What your security team should do

• Prioritize kernel updates on all systems exposing USB storage functionality
• Audit hardware inventories for ENE UB6250 readers and schedule phased rollouts
• Monitor vendor kernel packages for backported fixes in supported distributions
• Restrict untrusted USB device access via policy until patches are applied