{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40305","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.185Z","datePublished":"2025-12-08T00:46:30.327Z","dateUpdated":"2026-05-11T21:46:46.952Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:46:46.952Z"},"descriptions":[{"lang":"en","value":"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, 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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/9p/trans_fd.c"],"versions":[{"version":"aaec5a95d59615523db03dd53c2052f0a87beea7","lessThan":"242531004d7de8c159f9bfadebe33fe8060b1046","status":"affected","versionType":"git"},{"version":"aaec5a95d59615523db03dd53c2052f0a87beea7","lessThan":"e8fe3f07a357c39d429e02ca34f740692d88967a","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/9p/trans_fd.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","status":"unaffected","versionType":"semver"},{"version":"6.17.8","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.17.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/242531004d7de8c159f9bfadebe33fe8060b1046"},{"url":"https://git.kernel.org/stable/c/e8fe3f07a357c39d429e02ca34f740692d88967a"}],"title":"9p/trans_fd: p9_fd_request: kick rx thread if EPOLLIN","x_generator":{"engine":"bippy-1.2.0"}}}}