{"id":"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-\u003eseq is not ordered\naccording the oldest seq number. This ordering is required by\ndlm_receive_ack as \"before(mh-\u003eseq, seq)\" will stop to check for older\nsequence numbers that are ordered in the tail of \"node-\u003esend_queue\".\n\nThe side effects of not having it correct ordered regarding\n\"before(mh-\u003eseq, 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.","modified":"2026-08-18T03:56:54.468748286Z","published":"2026-08-15T05:59:12.099Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74401.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"489d8e559c6596eb08e16447d9830bc39afbe54e"},{"fixed":"ae9e534e502a0f48c12baf83608c5de0ff0eab11"},{"fixed":"6369619f1b665f12d8c99cc6ff733c64eb08b22e"},{"fixed":"712714f818d83373847874ab0f8e426be79296cf"},{"fixed":"4d45250b1d22960f86d83245be188b16e456218b"},{"fixed":"d2248cb70c070f8f04762872772e155b59016f17"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74401.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.14.0"},{"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-2026-74401.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}