CVE-2026-23357

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < 739454057572cb0948658d1142f3fa2c6966465caffected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < 416c18ecddafab0ed09be1e7b9d2f448f3d4db16affected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < 256f0cff6e946c570392bda1d01a65e789a7afd0affected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < b73832292cd914e87a55e863ba4413a907e7db6baffected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < 38063cc435b69d56e76f947c10d336fcb2953508affected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < d27f12c3f5e85efc479896af4a69eccb37f75e8eaffected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < e728f444c913a91d290d1824b4770780bbd6378eaffected
LinuxLinuxbf66f3736a945dd4e92d86427276c6eeab0a6c1d < ab3f894de216f4a62adc3b57e9191888cbf26885affected
LinuxLinux2.6.34affected
LinuxLinux0 < 2.6.34unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.167 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.77 <= 6.12.*unaffected
LinuxLinux6.18.17 <= 6.18.*unaffected
LinuxLinux6.19.7 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References