{"id":"CVE-2026-72492","summary":"ksmbd: fix use-after-free in same_client_has_lease()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in same_client_has_lease()\n\nsame_client_has_lease() returns an opinfo pointer from ci-\u003em_op_list\nafter dropping ci-\u003em_lock without taking a reference.\n\nsmb_grant_oplock() then dereferences that pointer in copy_lease() and\nwhen checking breaking_cnt. A concurrent close can remove the old lease\nfrom ci-\u003em_op_list and drop the last reference before the caller uses\nthe returned pointer, leading to a use-after-free.\n\nTake a reference when same_client_has_lease() selects an existing lease,\ndrop any previous match while scanning, and release the returned\nreference in smb_grant_oplock() after copying the lease state.","modified":"2026-08-18T03:56:27.134774114Z","published":"2026-08-15T05:57:26.967Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72492.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/09634cd055d9bd8dd167995ea52bcd8028dd5dac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0ff82a9cf9312678d8bc4edeef0b6e82659ac12a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/65b655f65c3ca1ab5d598d3832bb0ff531725858"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79c7c59bb519db6f5a2a151965e825ec725614cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c3264d273d524aa6adcce23c01087271f13586f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72492.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72492"},{"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":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9"},{"fixed":"aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0"},{"fixed":"09634cd055d9bd8dd167995ea52bcd8028dd5dac"},{"fixed":"7c3264d273d524aa6adcce23c01087271f13586f"},{"fixed":"79c7c59bb519db6f5a2a151965e825ec725614cc"},{"fixed":"35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d"},{"fixed":"0ff82a9cf9312678d8bc4edeef0b6e82659ac12a"},{"fixed":"65b655f65c3ca1ab5d598d3832bb0ff531725858"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72492.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72492.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}