CVE-2026-68214
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 longer reschedule i2c_gate_work. The subsequent cancel_delayed_work_sync() is then guaranteed to be final.
How to fix
- Linux Linux1e8a6bc19403661661fed5ae82f6eca6c9cdfad2, 68a9c0290897c1436ddceb8cea604c93377a0299, 13c06056699e66ff7109ba68658cc6ea4a23f516, 9acd5bbbe1df8e487e49488692c224496d4c9e16, 24bef237eef8dd1ebcffb129ba21891ddad0d309, 2c71bda6edc630a1f8c3c45d8df5fc22d234e042, 90d781711418881f8c836c2a859cc2886625d750, 680daf40a82d483949f87f0d8f98639dc47e610c or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 1e8a6bc19403661661fed5ae82f6eca6c9cdfad2, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 68a9c0290897c1436ddceb8cea604c93377a0299, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 13c06056699e66ff7109ba68658cc6ea4a23f516, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 9acd5bbbe1df8e487e49488692c224496d4c9e16, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 24bef237eef8dd1ebcffb129ba21891ddad0d309, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 2c71bda6edc630a1f8c3c45d8df5fc22d234e042, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 90d781711418881f8c836c2a859cc2886625d750, cddcc40b1b1553010acb89add84c64b5d123ec94 ≤ v < 680daf40a82d483949f87f0d8f98639dc47e610c, 4.7 | 1e8a6bc19403661661fed5ae82f6eca6c9cdfad2, 68a9c0290897c1436ddceb8cea604c93377a0299, 13c06056699e66ff7109ba68658cc6ea4a23f516, 9acd5bbbe1df8e487e49488692c224496d4c9e16, 24bef237eef8dd1ebcffb129ba21891ddad0d309, 2c71bda6edc630a1f8c3c45d8df5fc22d234e042, 90d781711418881f8c836c2a859cc2886625d750, 680daf40a82d483949f87f0d8f98639dc47e610c |
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