CVE-2023-54227 (GCVE-0-2023-54227)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-01-05 11:36
VLAI?
Title
blk-mq: fix tags leak when shrink nr_hw_queues
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e , < c0ef7493e68b8896806a2f598fcffbaa97333405 (git)
Affected: a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e , < e1dd7bc93029024af5688253b0c05181d6e01f8e (git)
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    Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.5.5 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: fix tags leak when shrink nr_hw_queues\n\nAlthough we don\u0027t need to realloc set-\u003etags[] when shrink nr_hw_queues,\nwe need to free them. Or these tags will be leaked.\n\nHow to reproduce:\n1. mount -t configfs configfs /mnt\n2. modprobe null_blk nr_devices=0 submit_queues=8\n3. mkdir /mnt/nullb/nullb0\n4. echo 1 \u003e /mnt/nullb/nullb0/power\n5. echo 4 \u003e /mnt/nullb/nullb0/submit_queues\n6. rmdir /mnt/nullb/nullb0\n\nIn step 4, will alloc 9 tags (8 submit queues and 1 poll queue), then\nin step 5, new_nr_hw_queues = 5 (4 submit queues and 1 poll queue).\nAt last in step 6, only these 5 tags are freed, the other 4 tags leaked."
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        "dateUpdated": "2026-01-05T11:36:53.997Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54227",
    "datePublished": "2025-12-30T12:11:20.207Z",
    "dateReserved": "2025-12-30T12:06:44.502Z",
    "dateUpdated": "2026-01-05T11:36:53.997Z",
    "state": "PUBLISHED"
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