{"apiVersion":"1.0","identifier":"CVE-2026-74392","description":"In the Linux kernel, the following vulnerability has been resolved: dm: limit target bio polling to one shot dm_poll_bio() is the ->poll_bio() callback for a stacked dm device. The caller only knows about the dm queue, so it may decide to do a spinning poll if it thinks a single queue is being polled. Passing those flags unchanged to the mapped clone lets blk_mq_poll() spin on a target queue from inside dm_poll_bio(). With io_uring IOPOLL on a dm-stripe target this can keep a task in dm_poll_bio() -> bio_poll() -> blk_mq_poll() long enough to trigger an RCU CPU stall, before io_uring gets back to io_iopoll_check() and its need_resched() check. Keep dm-s ->poll_bio() bounded by forcing one-shot polling for target bios. The caller can invoke dm_poll_bio() again if it wants to keep polling, and it also gets a chance to reap completions or reschedule between passes.","publishedAt":"2026-08-15T06:22:41","lastModifiedAt":"2026-08-17T06:19:34","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74392","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00156,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74392","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74392","en":"https://www.redsauce.net/en/cves/CVE-2026-74392","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74392","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74392","de":"https://www.redsauce.net/de/cves/CVE-2026-74392","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74392","el":"https://www.redsauce.net/el/cves/CVE-2026-74392"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74392"}}