---
cve: "CVE-2026-64509"
severity: "LOW"
cvss: 3.1
epss: "16%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-07-25 10:17:37"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T14:55:44+02:00"
---

# CVE-2026-64509

> 3.1 LOW

## Beschreibung

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 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.

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.97
- Kernel ≥ 6.18.39
- Kernel ≥ 7.1.4

## Referenzen

- <https://git.kernel.org/stable/c/d1dcaa5229a63a6b6df7e0f673fe576cf3d6e8cb>
- <https://git.kernel.org/stable/c/e7636f26f77070a529c26d65afd217514ce85ce4>
- <https://git.kernel.org/stable/c/6822a2685b4da9a87efd1fce4b042678a31ff734>
- <https://git.kernel.org/stable/c/2957771379fa335103a4b539db57bb2271e12142>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-64509) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_