{"apiVersion":"1.0","identifier":"CVE-2026-72034","description":"In the Linux kernel, the following vulnerability has been resolved: fhandle: reject detached mounts in capable_wrt_mount() The recent fhandle RCU fix moved the mount namespace capability check into capable_wrt_mount(), so a non-NULL mnt_namespace survives the ns_capable() dereference. The helper still assumes the later READ_ONCE(mount->mnt_ns) must be non-NULL because may_decode_fh() checked is_mounted() first. That assumption is not stable. A detached mount from open_tree(..., OPEN_TREE_CLONE) can be dissolved on fput while open_by_handle_at() is between those checks, and umount_tree() can clear mount->mnt_ns. If the helper observes NULL, it dereferences mnt_ns->user_ns and panics. Return false when the RCU read observes a detached mount. This keeps the relaxed permission path conservative: a mount no longer attached to a namespace cannot authorize open_by_handle_at() access.","publishedAt":"2026-08-15T06:21:12","lastModifiedAt":"2026-08-17T06:18:01","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72034","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00163,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72034","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72034","en":"https://www.redsauce.net/en/cves/CVE-2026-72034","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72034","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72034","de":"https://www.redsauce.net/de/cves/CVE-2026-72034","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72034","el":"https://www.redsauce.net/el/cves/CVE-2026-72034"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72034"}}