{"cve":"CVE-2026-90129","nvd":{"published":"2026-09-17T17:17:05.370","modified":"2026-10-21T13:20:38.327","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_balloon: quiesce balloon work before device shutdown\n\nCommit 8bd2fa086a04 (\"virtio: break and reset virtio devices on\ndevice_shutdown()\") added a generic virtio bus .shutdown handler that\nbreaks and resets every virtio device during device_shutdown(), i.e. on\nreboot and kexec.\n\nvirtio_balloon provides no .shutdown of its own, so that generic path\nruns while the balloon's asynchronous work is still armed. Once the\ndevice has been broken, virtqueue_add_inbuf() in\nvirtballoon_free_page_report() returns -EIO and trips its\nWARN_ON_ONCE(). On a kernel booted with panic_on_warn that turns an\nordinary reboot, for example a kexec based upgrade, into a fatal panic\nin the middle of device_shutdown(), so the machine never reaches the\nnew kernel.\n\nRelaxing that single WARN_ON_ONCE() would only hide the symptom: the\ninflate/deflate and OOM paths do not warn, they call\nwait_event(vb->acked, ...) and would instead block forever on a broken\nqueue that can no longer complete. The device has to be quiesced, not\njust kept quiet.\n\nAdd a .shutdown handler that quiesces the balloon via the shared\nvirtballoon_quiesce() helper while the device is still alive, and only\nthen breaks and resets it via virtio_device_shutdown(). Unlike\nvirtballoon_remove() the balloon workqueue is not destroyed, as shutdown\ndoes not free the device and cancel_work_sync() together with stop_update\nalready prevent any further work from being queued.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/6dd28e32f4d81a0d57c732b9900de24184e60a7d","https://git.kernel.org/stable/c/7e17eef04600c399c7e0f5ce765da5cf9d40d8e1","https://git.kernel.org/stable/c/bdef50a8226fc04899ef6815dd08a002247d47d5"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-90129","score":0.00206,"percentile":0.10596,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}