CVE-2026-64509 is a vulnerability in Linux Kernel
Published on July 25, 2026
rust: block: fix GenDisk cleanup paths
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.
Products Associated with CVE-2026-64509
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Affected Versions
Linux:- Version 3253aba3408aa4eb2e4e09365eede3e63ef7536b and below d1dcaa5229a63a6b6df7e0f673fe576cf3d6e8cb is affected.
- Version 3253aba3408aa4eb2e4e09365eede3e63ef7536b and below e7636f26f77070a529c26d65afd217514ce85ce4 is affected.
- Version 3253aba3408aa4eb2e4e09365eede3e63ef7536b and below 6822a2685b4da9a87efd1fce4b042678a31ff734 is affected.
- Version 3253aba3408aa4eb2e4e09365eede3e63ef7536b and below 2957771379fa335103a4b539db57bb2271e12142 is affected.
- Version 6.11 is affected.
- Before 6.11 is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.39, <= 6.18.* is unaffected.
- Version 7.1.4, <= 7.1.* is unaffected.
- Version 7.2-rc1, <= * is unaffected.