CVE-2025-39999blk-mq: fix blk_mq_tags double free while nr_requests grown
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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/20250815080216.410665-1-yukuai1@huaweicloud.com/
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- May 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 58567d8e95c096ad234963df90a2ca518901f4b6 builds before 8faee580d63bc2a54a59dcdb7f9ce4de29384fec; from f5a6604f7a4405450e4a1f54e5430f47290c500f before 392b1d64911f4de8887fe8b68299fa8bd6e5b923; from f5a6604f7a4405450e4a1f54e5430f47290c500f before ba28afbd9eff2a6370f23ef4e6a036ab0cfda409; from 6.16.4 before 6.16.11 | CNA record |
References
- https://git.kernel.org/stable/c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec
- https://git.kernel.org/stable/c/392b1d64911f4de8887fe8b68299fa8bd6e5b923
- https://git.kernel.org/stable/c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.