CVE-2026-68214

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

media: rtl2832: fix use-after-free in rtl2832_remove()

cancel_delayed_work_sync() is called before i2c_mux_del_adapters()

in rtl2832_remove(). While the cancel waits for any running instance

of i2c_gate_work to finish, it does not prevent the timer from being

rescheduled by a concurrent thread.

During probe, the r820t_attach() call attempts I2C transfers through

the mux adapter. These transfers go through i2c_mux_master_xfer(),

which calls rtl2832_deselect() after the transfer completes,

rescheduling i2c_gate_work via schedule_delayed_work(). If this

transfer is still in flight when rtl2832_remove() runs,

rtl2832_deselect() can reschedule i2c_gate_work after it has been

cancelled, causing a use-after-free when kfree(dev) is called.

Fix this by calling i2c_mux_del_adapters() before

cancel_delayed_work_sync(). Once the mux adapter is unregistered, no

new I2C transfers can go through it, so rtl2832_deselect() can no

l

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References