Vulnerability 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/[email protected]/
References
- https://git.kernel.org/stable/c/392b1d64911f4de8887fe8b68299fa8bd6e5b923
- https://git.kernel.org/stable/c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec
- https://git.kernel.org/stable/c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409
FAQ
What is CVE-2025-39999?
CVE-2025-39999 is a documented vulnerability. 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_request...
How severe is CVE-2025-39999?
CVSS scoring is not yet available for CVE-2025-39999. Check NVD for updates.
Is there a patch for CVE-2025-39999?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.