{"id":"CVE-2025-40305","title":"In the Linux kernel, the following vulnerability has been resolved:\n\n9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN\n\np9_read_work() doesn't set Rworksched and doesn't do schedule_work(m->rq)\nif list_empty(&m->req_list).\n\nHowever, …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\n9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN\n\np9_read_work() doesn't set Rworksched and doesn't do schedule_work(m->rq)\nif list_empty(&m->req_list).\n\nHowever, …","severity":"none","published":"2025-12-08","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:10:00.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40305","references":[{"url":"https://git.kernel.org/stable/c/242531004d7de8c159f9bfadebe33fe8060b1046","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e8fe3f07a357c39d429e02ca34f740692d88967a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00172,"epssPercentile":0.06147,"ingestedAt":"2026-10-14T23:00:02.019Z","slug":"CVE-2025-40305","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\n9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN\n\np9_read_work() doesn't set Rworksched and doesn't do schedule_work(m->rq)\nif list_empty(&m->req_list).\n\nHowever, if the pipe is full, we need to read more data and this used to\nwork prior to commit aaec5a95d59615 (\"pipe_read: don't wake up the writer\nif the pipe is still full\").\n\np9_read_work() does p9_fd_read() -> ... -> anon_pipe_read() which (before\nthe commit above) triggered the unnecessary wakeup. This wakeup calls\np9_pollwake() which kicks p9_poll_workfn() -> p9_poll_mux(), p9_poll_mux()\nwill notice EPOLLIN and schedule_work(&m->rq).\n\nThis no longer happens after the optimization above, change p9_fd_request()\nto use p9_poll_mux() instead of only checking for EPOLLOUT.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}