CVE-2023-54227blk-mq: fix tags leak when shrink nr_hw_queues
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 tags leak when shrink nr_hw_queues Although we don't need to realloc set->tags[] when shrink nr_hw_queues, we need to free them. Or these tags will be leaked. How to reproduce: 1. mount -t configfs configfs /mnt 2. modprobe null_blk nr_devices=0 submit_queues=8 3. mkdir /mnt/nullb/nullb0 4. echo 1 > /mnt/nullb/nullb0/power 5. echo 4 > /mnt/nullb/nullb0/submit_queues 6. rmdir /mnt/nullb/nullb0 In step 4, will alloc 9 tags (8 submit queues and 1 poll queue), then in step 5, new_nr_hw_queues = 5 (4 submit queues and 1 poll queue). At last in step 6, only these 5 tags are freed, the other 4 tags leaked.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- 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
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e before 26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd; from a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e before c0ef7493e68b8896806a2f598fcffbaa97333405; from a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e before e1dd7bc93029024af5688253b0c05181d6e01f8e | CNA record |
References
- https://git.kernel.org/stable/c/26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd
- https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405
- https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e
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.