{"id":"CVE-2023-54227","title":"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't need to realloc set->tags[] when shrink nr_hw_queues,\nwe need to free them","summary":"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't need to realloc set->tags[] when shrink nr_hw_queues,\nwe need to free them. Or these tags will be leak…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e < 26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd","Linux >= a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e < c0ef7493e68b8896806a2f598fcffbaa97333405","Linux >= a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e < e1dd7bc93029024af5688253b0c05181d6e01f8e","Linux 5.16"],"published":"2025-12-30","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:29.567","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-54227","references":[{"url":"https://git.kernel.org/stable/c/26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00412,"epssPercentile":0.33118,"ingestedAt":"2026-10-03T11:43:42.113Z","slug":"CVE-2023-54227","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: fix tags leak when shrink nr_hw_queues\n\nAlthough we don't need to realloc set->tags[] 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 > /mnt/nullb/nullb0/power\n5. echo 4 > /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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}