{"id":"CVE-2025-39999","summary":"blk-mq: fix blk_mq_tags double free while nr_requests grown","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: fix blk_mq_tags double free while nr_requests grown\n\nIn the case user trigger tags grow by queue sysfs attribute nr_requests,\nhctx-\u003esched_tags will be freed directly and replaced with a new\nallocated tags, see blk_mq_tag_update_depth().\n\nThe problem is that hctx-\u003esched_tags is from elevator-\u003eet-\u003etags, while\net-\u003etags is still the freed tags, hence later elevator exit will try to\nfree the tags again, causing kernel panic.\n\nFix this problem by replacing et-\u003etags with new allocated tags as well.\n\nNoted there are still some long term problems that will require some\nrefactor to be fixed thoroughly[1].\n\n[1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/","modified":"2026-08-12T03:51:48.064973617Z","published":"2025-10-15T07:58:23.038Z","related":["openSUSE-SU-2025:15671-1","openSUSE-SU-2026:10301-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39999.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/392b1d64911f4de8887fe8b68299fa8bd6e5b923"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39999.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39999"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"58567d8e95c096ad234963df90a2ca518901f4b6"},{"fixed":"8faee580d63bc2a54a59dcdb7f9ce4de29384fec"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f5a6604f7a4405450e4a1f54e5430f47290c500f"},{"fixed":"392b1d64911f4de8887fe8b68299fa8bd6e5b923"},{"fixed":"ba28afbd9eff2a6370f23ef4e6a036ab0cfda409"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.16.4"},{"fixed":"6.16.11"}]}],"versions":["v6.16.10","v6.16.9","v6.16.8","v6.16.7","v6.16.6","v6.16.5","v6.16.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39999.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.16.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.17.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39999.json"}}],"schema_version":"1.9.0"}