{"id":"CVE-2026-72492","aliases":[],"url":"https://o3.security/vulnerability/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->m_op_list\nafter dropping ci->m_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->m_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.","published":"2026-08-15T05:57:26.967Z","modified":"2026-08-18T03:56:27.134774114Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.15.212"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:27.134774114Z"}}