{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"9bb28e7740ce78beecafc5db074b45f4cbeb8a47","status":"affected","version":"130bd686d9be918e4cc8c03abf5794ba2d860502","versionType":"git"},{"lessThan":"d8c618747a6aa90022e19ec614aa7157d0302108","status":"affected","version":"130bd686d9be918e4cc8c03abf5794ba2d860502","versionType":"git"},{"lessThan":"2c88d978f1dfd03edf67924ea8fd25cc45499eef","status":"affected","version":"130bd686d9be918e4cc8c03abf5794ba2d860502","versionType":"git"},{"lessThan":"92bfadcbe0a9a001beb5e58a2abaf040b873deb6","status":"affected","version":"130bd686d9be918e4cc8c03abf5794ba2d860502","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.161","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.115","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.60","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.14","versionType":"semver"}]}],"cveId":"CVE-2026-99268","cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: wake ring pollers for local task_work\n\nWith IORING_SETUP_DEFER_TASKRUN completions are queued as local work, and\nonly become CQEs when the submitter enters the kernel to wait for events.\nFor an application that finds out via poll() or epoll on the ring fd when\nit is time to do that, io_uring_poll() reports EPOLLIN if local work is\npending.\n\nThat only helps if the work is there at the time of the call. When\nDEFER_TASKRUN was added, io_req_local_work_add() did io_cqring_wake(),\nwhich took care of tasks sleeping in poll() as well. Then polling got a\nwait queue of its own, ->poll_wq, and the wake up in\nio_req_local_work_add() was replaced by waking the submitter directly.\nSince then ->poll_wq is only woken when CQEs are committed, which for\nsuch a ring is done by the very task that is waiting to be told to:\n\n  submitter                           completion\n  poll(ring_fd)\n    io_uring_poll()  // nothing yet\n    schedule()\n                                      io_req_local_work_add()\n                                        // ->cq_wait_nr: nobody waits\n  // sleeps on\n\nWake ->poll_wq when the first entry is put on the work list. Like for the\neventfd, that must not be done right away if the work is queued from a\nwake up handler, as the chain of wake ups could get back to the wait\nqueue whose lock is held. Use an RCU callback in that case, with a\nreference to the ring.","epss":null,"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793706497911,"publishedAt":1793706497911,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/9bb28e7740ce78beecafc5db074b45f4cbeb8a47"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/d8c618747a6aa90022e19ec614aa7157d0302108"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/2c88d978f1dfd03edf67924ea8fd25cc45499eef"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/92bfadcbe0a9a001beb5e58a2abaf040b873deb6"}],"remediation":[],"revision":"86c6670b0506fc0ae2f914b1c1e6ba3812fd4b2704c9c8a4374026f49c071316","sources":[{"modifiedAt":1793706497911,"name":"CNA: Linux","retrievedAt":1793707759124,"url":"https://www.cve.org/CVERecord?id=CVE-2026-99268"}],"ssvc":null,"status":"published","title":"io_uring: wake ring pollers for local task_work","updatedAt":1793707759124}