Description
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.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < 739454057572cb0948658d1142f3fa2c6966465c; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < 416c18ecddafab0ed09be1e7b9d2f448f3d4db16; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < 256f0cff6e946c570392bda1d01a65e789a7afd0; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < b73832292cd914e87a55e863ba4413a907e7db6b; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < 38063cc435b69d56e76f947c10d336fcb2953508; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < d27f12c3f5e85efc479896af4a69eccb37f75e8e; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < e728f444c913a91d290d1824b4770780bbd6378e; >= bf66f3736a945dd4e92d86427276c6eeab0a6c1d, < ab3f894de216f4a62adc3b57e9191888cbf26885 |
| Linux | Linux | 2.6.34 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
References
- https://git.kernel.org/stable/c/256f0cff6e946c570392bda1d01a65e789a7afd0Patch
- https://git.kernel.org/stable/c/38063cc435b69d56e76f947c10d336fcb2953508Patch
- https://git.kernel.org/stable/c/416c18ecddafab0ed09be1e7b9d2f448f3d4db16Patch
- https://git.kernel.org/stable/c/739454057572cb0948658d1142f3fa2c6966465cPatch
- https://git.kernel.org/stable/c/ab3f894de216f4a62adc3b57e9191888cbf26885Patch
- https://git.kernel.org/stable/c/b73832292cd914e87a55e863ba4413a907e7db6bPatch
- https://git.kernel.org/stable/c/d27f12c3f5e85efc479896af4a69eccb37f75e8ePatch
- https://git.kernel.org/stable/c/e728f444c913a91d290d1824b4770780bbd6378ePatch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Timeline
- Published
- Mar 25, 2026
- Last modified
- Oct 15, 2026
- NVD status
- Modified