mtd: rawnand: serialize lock/unlock against other NAND operations

Summary

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.

Timeline

1. Apr 3, 2026, 3:15 PM UTCCVE published
2. Oct 16, 2026, 3:08 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 19, 2026, 6:35 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in 28ea836cc44cb8b89c1c174707ead0c1133c60e9; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in fe4a73c3dd48308149d57a10c2761e1d36ced7ba; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in ce5229e78078e437704157eb542f43a6f83b429b; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in a80291e577b44593a724d6cd64c14337c78f194d; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in 5fd5c078af23cb353507aa522e09d557d7eaef04; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in f25446e2c28939753d3b62d34dfda49952b2557d; From 92270086b7e5ada7ab381c06cc3da2e95ed17088 · fixed in bab2bc6e850a697a23b9e5f0e21bb8c187615e95

• Linux Linux

  5.7

• KernelLinux

  From 5.7.0 · 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 6.12.78; From 6.13.0 · fixed in 6.18.20; From 6.19.0 · fixed in 6.19.10

References 8