{"id":"CVE-2026-74401","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74401","summary":"dlm: fix add msg handle in send_queue ordered","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndlm: fix add msg handle in send_queue ordered\n\nIn a benchmark scenario triggering a lot of requests that triggers a lot\nof DLM messages on the network it can be that the mh->seq is not ordered\naccording the oldest seq number. This ordering is required by\ndlm_receive_ack as \"before(mh->seq, seq)\" will stop to check for older\nsequence numbers that are ordered in the tail of \"node->send_queue\".\n\nThe side effects of not having it correct ordered regarding\n\"before(mh->seq, seq)\" are refcounting issues and use-after free.\n\nI only was able to reproduce this issue in a experimental DLM branch\nand a user space DLM benchmark that uses io_uring. After changing this I\ndon't experienced any refcounting with the sending buffer issues anymore.","published":"2026-08-15T05:59:12.099Z","modified":"2026-08-18T03:56:54.468748286Z","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":"6.6.145"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4d45250b1d22960f86d83245be188b16e456218b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6369619f1b665f12d8c99cc6ff733c64eb08b22e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/712714f818d83373847874ab0f8e426be79296cf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ae9e534e502a0f48c12baf83608c5de0ff0eab11"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2248cb70c070f8f04762872772e155b59016f17"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74401.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74401"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:54.468748286Z"}}