{"id":"CVE-2026-93096","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Serialize multi-part Get/Set Feature transfers\n\nA Get or Set Feature payload larger than the mailbox payload size is\nsplit into several mailbox commands","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Serialize multi-part Get/Set Feature transfers\n\nA Get or Set Feature payload larger than the mailbox payload size is\nsplit into several mailbox commands. …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 5e5ac21f629de796ab5d598b59c5e468c6fe4f95 < 7682b617db1f19bc606b5f1badadcf1e63a87b14","Linux >= 5e5ac21f629de796ab5d598b59c5e468c6fe4f95 < 77b814c1832fde018c30357b4ec3fcdaa91a1c10","Linux 6.15"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:18:03.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93096","references":[{"url":"https://git.kernel.org/stable/c/7682b617db1f19bc606b5f1badadcf1e63a87b14","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/77b814c1832fde018c30357b4ec3fcdaa91a1c10","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.758Z","epss":0.00189,"epssPercentile":0.08803,"slug":"CVE-2026-93096","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Serialize multi-part Get/Set Feature transfers\n\nA Get or Set Feature payload larger than the mailbox payload size is\nsplit into several mailbox commands. mbox_mutex only serializes\nindividual mailbox commands and is dropped between iterations of these\nloops. Nothing serializes the multi-part transfer as a whole.\ncxl_get_feature() and cxl_set_feature() are reachable concurrently\nfrom fwctl (per-fd RPCs run under a read-held registration lock) and\nfrom the EDAC scrub/ECS/repair paths, so two transfers to the same\nmailbox can interleave their parts and corrupt the device's transfer\ncontext.\n\nAdd a per-mailbox feat_mutex and hold it across the whole transfer in\nboth functions. It nests outside mbox_mutex (which is taken inside\ncxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering\ninversion is introduced.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}