can: mcp251x: fix deadlock in error path of mcp251x_open

Summary

In the Linux kernel, the following vulnerability has been resolved: can: mcp251x: fix deadlock in error path of mcp251x_open The mcp251x_open() function call free_irq() in its error path with the mpc_lock mutex held. But if an interrupt already occurred the interrupt handler will be waiting for the mpc_lock and free_irq() will deadlock waiting for the handler to finish. This issue is similar to the one fixed in commit 7dd9c26bd6cf ("can: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open") but for the error path. To solve this issue move the call to free_irq() after the lock is released. Setting `priv->force_quit = 1` beforehand ensure that the IRQ handler will exit right away once it acquired the lock.

Timeline

1. Mar 25, 2026, 10:27 AM UTCCVE published
2. Oct 15, 2026, 1:14 AM UTCRecord last updated

Affected versions

• Linux Linux

  From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in 739454057572cb0948658d1142f3fa2c6966465c; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in 416c18ecddafab0ed09be1e7b9d2f448f3d4db16; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in 256f0cff6e946c570392bda1d01a65e789a7afd0; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in b73832292cd914e87a55e863ba4413a907e7db6b; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in 38063cc435b69d56e76f947c10d336fcb2953508; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in d27f12c3f5e85efc479896af4a69eccb37f75e8e; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in e728f444c913a91d290d1824b4770780bbd6378e; From bf66f3736a945dd4e92d86427276c6eeab0a6c1d · fixed in ab3f894de216f4a62adc3b57e9191888cbf26885

• Linux Linux

  2.6.34

• KernelLinux

  From 2.6.34 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.77; From 6.13.0 · fixed in 6.18.17; From 6.19.0 · fixed in 6.19.7

References 8