{"id":"CVE-2026-68381","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-68381","summary":"ksmbd: pin conn during async oplock break notification","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: pin conn during async oplock break notification\n\nsmb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn\npointer in an async ksmbd_work and then queue that work on ksmbd-io.  The\nwork only increments conn->r_count, which prevents teardown from passing\nthe pending-request wait after the increment, but it does not pin the\nstruct ksmbd_conn object.\n\nIf connection teardown races with an oplock break notification, the last\nconn reference can be dropped before the queued worker finishes.  The\nworker then uses the freed conn in ksmbd_conn_write() and\nksmbd_conn_r_count_dec().\n\nTake a real conn reference when publishing the conn pointer to the async\nwork item, and drop it after the notification work has decremented\nr_count.  Apply the same lifetime rule to lease break notification, which\nuses the same work->conn pattern.","published":"2026-08-10T12:03:59.849Z","modified":"2026-08-14T04:04:01.585516128Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.148"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258"},{"type":"WEB","url":"https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68381.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68381"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:04:01.585516128Z"}}