CVE-2023-54227

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405
https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e

Configurations

No configuration.

History

04 Aug 2026, 11:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

30 Dec 2025, 13:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-30 13:16

Updated : 2026-08-04 11:16

NVD link : CVE-2023-54227

Mitre link : CVE-2023-54227

CVE.ORG link : CVE-2023-54227

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2023-54227", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e", "lessThan": "c0ef7493e68b8896806a2f598fcffbaa97333405", "versionType": "git"}, {"status": "affected", "version": "a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e", "lessThan": "e1dd7bc93029024af5688253b0c05181d6e01f8e", "versionType": "git"}], "programFiles": ["block/blk-mq.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"status": "unaffected", "version": "0", "lessThan": "5.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.5.5", "versionType": "semver", "lessThanOrEqual": "6.5.*"}, {"status": "unaffected", "version": "6.6", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["block/blk-mq.c"], "defaultStatus": "affected"}]}], "published": "2025-12-30T13:16:11.093", "references": [{"url": "https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Deferred", "descriptions": [{"lang": "en", "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'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."}], "lastModified": "2026-08-04T11:16:37.687", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}