CVE-2026-64509

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

rust: block: fix GenDisk cleanup paths

GenDiskBuilder::build() still has fallible work after

__blk_mq_alloc_disk(), but its error path only recovers the

foreign queue data. That leaks the temporary gendisk and

request_queue until later teardown. If the caller moved the last

Arc<TagSet<T>> into build(), the leaked queue can retain blk-mq

state after the tag set is dropped.

Fix the pre-registration failure path by dropping the temporary

gendisk reference with put_disk() before recovering queue_data,

so disk_release() can tear down the owned queue.

Also pair GenDisk::drop() with put_disk() after del_gendisk().

Once a Rust GenDisk has been added with device_add_disk(),

del_gendisk() only unregisters it; the final gendisk reference

still has to be dropped to complete the release path.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References