{"id":"CVE-2026-93078","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Reject Set Features output buffer smaller than the header\n\ncxlctl_set_feature() sizes its output buffer from the user's\nfwctl_rpc.out_len but never checks…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Reject Set Features output buffer smaller than the header\n\ncxlctl_set_feature() sizes its output buffer from the user's\nfwctl_rpc.out_len but never checks…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= eb5dfcb9e36d0e46089fec777d911313c1876fa3 < 1281dc84c81577b51e2b61c24617c9f44b2cdb99","Linux >= eb5dfcb9e36d0e46089fec777d911313c1876fa3 < 16b7c99eff030c6ea11ca24efa4b9f989cc74093","Linux >= eb5dfcb9e36d0e46089fec777d911313c1876fa3 < cde18d6c1d913a67ab0afd3d9475ece4be79da50","Linux 6.15"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:18:01.743","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93078","references":[{"url":"https://git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.762Z","epss":0.00198,"epssPercentile":0.09822,"slug":"CVE-2026-93078","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Reject Set Features output buffer smaller than the header\n\ncxlctl_set_feature() sizes its output buffer from the user's\nfwctl_rpc.out_len but never checks it is large enough to hold even the\nfwctl_rpc_cxl_out header. With out_len == 0 , kvzalloc() returns\nZERO_SIZE_PTR, which passes the !rpc_out check, the subsequent\nrpc_out->size = 0 then writes through the poison pointer.\n\nReject requests whose output buffer can't hold the response header,\nbefore allocating. The Set Feature reply carries no payload, so the\nheader is all that is required.\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":[]}