CVE-2025-39999 The advisory has been revoked - it doesn't affect any version of package kernel-headers (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-KERNELHEADERS-13602732
- published17 Oct 2025
- disclosed15 Oct 2025
Introduced: 15 Oct 2025
CVE-2025-39999 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by RHEL.
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/
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2404126
- https://access.redhat.com/security/cve/CVE-2025-39999
- https://git.kernel.org/stable/c/392b1d64911f4de8887fe8b68299fa8bd6e5b923
- https://git.kernel.org/stable/c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec
- https://git.kernel.org/stable/c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409