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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/[email protected]/
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-oracleUpgrade linux-realtimeUpgrade linux-riscvUpgrade linux-raspiUpgrade linux-awsUpgrade linuxUpgrade linux-azureUpgrade linux-gcp | Oct 30, 2025 | Oct 15, 2025 |
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