CVE-2026-23357
Published: March 27, 2026Last modified: April 9, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.167-r0) |
| 25 LTS | linux-lts | Fixed (6.12.80-r0) | |
| Stream | linux-lts | Fixed (6.12.80-r0) |
References
- https://git.kernel.org/stable/c/256f0cff6e946c570392bda1d01a65e789a7afd0
- https://git.kernel.org/stable/c/38063cc435b69d56e76f947c10d336fcb2953508
- https://git.kernel.org/stable/c/416c18ecddafab0ed09be1e7b9d2f448f3d4db16
- https://git.kernel.org/stable/c/739454057572cb0948658d1142f3fa2c6966465c
- https://git.kernel.org/stable/c/ab3f894de216f4a62adc3b57e9191888cbf26885
- https://git.kernel.org/stable/c/b73832292cd914e87a55e863ba4413a907e7db6b
- https://git.kernel.org/stable/c/d27f12c3f5e85efc479896af4a69eccb37f75e8e
- https://git.kernel.org/stable/c/e728f444c913a91d290d1824b4770780bbd6378e