Description
In the Linux kernel, the following vulnerability has been resolved:
blk-mq: fix blk_mq_tags double free while nr_requests grown
In the case user trigger tags grow by queue sysfs attribute nr_requests, hctx->sched_tags will be freed directly and replaced with a new allocated tags, see blk_mq_tag_update_depth().
The problem is that hctx->sched_tags is from elevator->et->tags, while et->tags is still the freed tags, hence later elevator exit will try to free the tags again, causing kernel panic.
Fix this problem by replacing et->tags with new allocated tags as well.
Noted there are still some long term problems that will require some refactor to be fixed thoroughly[1].
[1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 58567d8e95c096ad234963df90a2ca518901f4b6, < 8faee580d63bc2a54a59dcdb7f9ce4de29384fec; >= f5a6604f7a4405450e4a1f54e5430f47290c500f, < 392b1d64911f4de8887fe8b68299fa8bd6e5b923; >= f5a6604f7a4405450e4a1f54e5430f47290c500f, < ba28afbd9eff2a6370f23ef4e6a036ab0cfda409; >= 6.16.4, < 6.16.11 |
| Linux | Linux | 6.17 |
References
Timeline
- Published
- Oct 15, 2025
- Last modified
- Oct 19, 2026
- NVD status
- Deferred