{"id":"CVE-2026-93078","summary":"cxl/features: Reject Set Features output buffer smaller than the header","details":"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 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-\u003esize = 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.","modified":"2026-09-19T03:47:27.864873390Z","published":"2026-09-17T16:10:59.686Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93078.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99"},{"type":"WEB","url":"https://git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93078.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93078"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"eb5dfcb9e36d0e46089fec777d911313c1876fa3"},{"fixed":"1281dc84c81577b51e2b61c24617c9f44b2cdb99"},{"fixed":"16b7c99eff030c6ea11ca24efa4b9f989cc74093"},{"fixed":"cde18d6c1d913a67ab0afd3d9475ece4be79da50"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93078.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.15.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93078.json"}}],"schema_version":"1.9.0"}