{"apiVersion":"1.0","identifier":"CVE-2026-74365","description":"In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: Handle preemption in BTT lane acquisition BTT lanes serialize access to per-lane metadata and workspace state during BTT I/O. The btt-check unit test reports data mismatches during BTT writes due to a race in lane acquisition that can lead to silent data corruption. The existing lane model uses a spinlock together with a per-CPU recursion count. That recursion model stopped being valid after BTT lanes became preemptible: another task can run on the same CPU, observe a non-zero recursion count, bypass locking, and use the same lane concurrently. BTT lanes are also held across arena_write_bytes() calls. That path reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush(). Some provider flush callbacks can sleep, making a spinlock the wrong primitive for the lane lifetime. Replace the spinlock-based recursion model with a dynamically allocated per-lane mutex array and take the lane lock unconditionally. Add might_sleep() to catch any future atomic-context caller. Found with the ndctl unit test btt-check.sh.","publishedAt":"2026-08-15T06:22:38","lastModifiedAt":"2026-08-17T06:19:31","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74365","cvssScore":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","epssProbability":0.00132,"riskScore":0.74,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74365","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74365","en":"https://www.redsauce.net/en/cves/CVE-2026-74365","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74365","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74365","de":"https://www.redsauce.net/de/cves/CVE-2026-74365","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74365","el":"https://www.redsauce.net/el/cves/CVE-2026-74365"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74365"}}