{"id":"CVE-2023-54227","revision":"b02ca03f38d84b3a8dd16d8e17569c15","records":[{"revision":"b02ca03f38d84b3a8dd16d8e17569c15","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-54227","aliases":[],"title":"blk-mq: fix tags leak when shrink nr_hw_queues","description":"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.","state":0,"publishedAt":"2025-12-30T12:11:20.207+00:00","modifiedAt":"2026-10-15T21:41:42.461+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/blk-mq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e\",\n                            \"lessThan\": \"26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e\",\n                            \"lessThan\": \"c0ef7493e68b8896806a2f598fcffbaa97333405\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e\",\n                            \"lessThan\": \"e1dd7bc93029024af5688253b0c05181d6e01f8e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/blk-mq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.5.5\",\n                            \"lessThanOrEqual\": \"6.5.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd","https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405","https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54227","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-54227","identifiers":["CVE-2023-54227"]},"retained":false,"historicalAffected":[]}],"coverage":[]}