CVE-2026-23434

Description

In the Linux kernel, the following vulnerability has been resolved: mtd: rawnand: serialize lock/unlock against other NAND operations nand_lock() and nand_unlock() call into chip->ops.lock_area/unlock_area without holding the NAND device lock. On controllers that implement SET_FEATURES via multiple low-level PIO commands, these can race with concurrent UBI/UBIFS background erase/write operations that hold the device lock, resulting in cmd_pending conflicts on the NAND controller. Add nand_get_device()/nand_release_device() around the lock/unlock operations to serialize them against all other NAND controller access.

References

• https://git.kernel.org/stable/c/5fd5c078af23cb353507aa522e09d557d7eaef04
• https://git.kernel.org/stable/c/a80291e577b44593a724d6cd64c14337c78f194d
• https://git.kernel.org/stable/c/bab2bc6e850a697a23b9e5f0e21bb8c187615e95
• https://git.kernel.org/stable/c/ce5229e78078e437704157eb542f43a6f83b429b
• https://git.kernel.org/stable/c/f25446e2c28939753d3b62d34dfda49952b2557d