CVE-2025-38141 Information

Jul 04, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

dm: fix dm_blk_report_zones

If dm_get_live_table() returned NULL dm_put_live_table() was never called. Also it is possible that md->zone_revalidate_map will change while calling this function. Only read it once so that we are always using the same value. Otherwise we might miss a call to dm_put_live_table().

Finally while md->zone_revalidate_map is set and a process is calling blk_revalidate_disk_zones() to set up the zone append emulation resources it is possible that another process perhaps triggered by blkdev_report_zones_ioctl() will call dm_blk_report_zones(). If blk_revalidate_disk_zones() fails these resources can be freed while the other process is still using them causing a use-after-free error.

blk_revalidate_disk_zones() will only ever be called when initially setting up the zone append emulation resources such as when setting up a zoned dm-crypt table for the first time. Further table swaps will not set md->zone_revalidate_map or call blk_revalidate_disk_zones(). However it must be called using the new table (referenced by md->zone_revalidate_map) and the new queue limits while the DM device is suspended. dm_blk_report_zones() needs some way to distinguish between a call from blk_revalidate_disk_zones() which must be allowed to use md->zone_revalidate_map to access this not yet activated table and all other calls to dm_blk_report_zones() which should not be allowed while the device is suspended and cannot use md->zone_revalidate_map since the zone resources might be freed by the process currently calling blk_revalidate_disk_zones().

Solve this by tracking the process that sets md->zone_revalidate_map in dm_revalidate_zones() and only allowing that process to make use of it in dm_blk_report_zones().

Reference

https://git.kernel.org/stable/c/37f53a2c60d03743e0eacf7a0c01c279776fef4e https://git.kernel.org/stable/c/d19bc1b4dd5f322980b1f05f79b2ea4f0db10920 https://git.kernel.org/stable/c/f9c1bdf24615303d48a2d0fd629c88f3189563aa

CNNVD-202507-227 (Published: 2025-07-03)

Share on: