CVE-2025-38140
MediumCVSS 5.5Summary
In the Linux kernel, a bug was fixed in the dm (device mapper) function dm_revalidate_zones(), which failed to properly update zoned settings on table reload when the device already had zone write plug resources. This caused a mismatch in conv_zones_bitmap size and invalid memory read errors. The fix restricts table reloads that change zoned settings for devices with allocated zone plug resources.
Risk Assessment
May cause kernel errors (invalid memory reads) or instability of zoned block devices, leading to crashes or data loss. Affects environments using device mapper on Zoned Block Devices.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2025-38140. Avoid dm table reloads that change zoned settings on devices with active zone write plug resources until the update is applied.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: dm: limit swapping tables for devices with zone write plugs dm_revalidate_zones() only allowed new or previously unzoned devices to call blk_revalidate_disk_zones(). If the device was already zoned, disk->nr_zones would always equal md->nr_zones, so dm_revalidate_zones() returned without doing any work. This would make the zoned settings for the device not match the new table. If the device had zone write plug resources, it could run into errors like bdev_zone_is_seq() reading invalid memory because disk->conv_zones_bitmap was the wrong size. If the device doesn't have any zone write plug resources, calling blk_revalidate_disk_zones() will always correctly update device. If blk_revalidate_disk_zones() fails, it can still overwrite or clear the current disk->nr_zones value. In this case, DM must restore the previous value of disk->nr_zones, so that the zoned settings will continue to match the previous value that it fell back to. If the device already has zone write plug resources, blk_revalidate_disk_zones() will not correctly update them, if it is called for arbitrary zoned device changes. Since there is not much need for this ability, the easiest solution is to disallow any table reloads that change the zoned settings, for devices that already have zone plug resources. Specifically, if a device already has zone plug resources allocated, it can only switch to another zoned table that also emulates zone append. Also, it cannot change the device size or the zone size. A device can switch to an error target.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS