{"apiVersion":"1.0","identifier":"CVE-2026-74721","description":"In the Linux kernel, the following vulnerability has been resolved: accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages() Two error paths in amdxdna_insert_pages() called vma->vm_ops->close(vma) before returning an error code to the caller. This is incorrect: amdxdna_gem_obj_mmap() registers an HMM interval notifier before calling amdxdna_insert_pages(), and on a hard error it jumps to hmm_unreg to undo that registration. Calling vm_ops->close() manually — which drops the shmem pages_pin_count and the GEM object reference that backs the VMA — before the mmap syscall has even returned causes those resources to be released while the VMA is still alive. The kernel VMA teardown will call vm_ops->close() a second time when the process later unmaps the range, producing a reference count underflow. Replace both hard-error returns with a deferred-fault approach that keeps the VMA alive and retries page insertion through the HMM range-fault path.","publishedAt":"2026-08-22T16:16:47","lastModifiedAt":"2026-08-25T06:18:57","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74721","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.0012,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74721","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74721","en":"https://www.redsauce.net/en/cves/CVE-2026-74721","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74721","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74721","de":"https://www.redsauce.net/de/cves/CVE-2026-74721","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74721","el":"https://www.redsauce.net/el/cves/CVE-2026-74721"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74721"}}