{"id":"CVE-2026-93079","revision":"18ebbf3299e945449da4b5c8fa9c4a18","records":[{"revision":"18ebbf3299e945449da4b5c8fa9c4a18","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93079","aliases":[],"title":"cxl/features: Reject Get Feature count larger than the output buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Reject Get Feature count larger than the output buffer\n\ncxlctl_get_feature() sizes its output buffer from the user's\nfwctl_rpc.out_len, but the device is told to write\ncxl_mbox_get_feat_in.count bytes into rpc_out->payload, which is a\nseparate user-controlled value. Nothing bounds count against out_len, so\na small out_len with a large count overflows the kvzalloc()'d buffer.\nA heap OOB write reachable from FWCTL_RPC.\n\nReject requests where count exceeds the available payload room, before\nallocating.","state":0,"publishedAt":"2026-09-17T16:11:00.35+00:00","modifiedAt":"2026-10-19T09:05:15.062+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/cxl/core/features.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5908f3ed6dc209e5c824e63afda7545805f75a7e\",\n                            \"lessThan\": \"3f02031a0a53de0d3ef066c92d0486b2b11be40c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5908f3ed6dc209e5c824e63afda7545805f75a7e\",\n                            \"lessThan\": \"329ea475581c647a680a6937e353c1a6e2534b40\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5908f3ed6dc209e5c824e63afda7545805f75a7e\",\n                            \"lessThan\": \"4bf6bac375076ced2fa4b3fef8739bd985f93456\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/cxl/core/features.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3f02031a0a53de0d3ef066c92d0486b2b11be40c","https://git.kernel.org/stable/c/329ea475581c647a680a6937e353c1a6e2534b40","https://git.kernel.org/stable/c/4bf6bac375076ced2fa4b3fef8739bd985f93456"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93079","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93079","identifiers":["CVE-2026-93079"]},"retained":false,"historicalAffected":[]}],"coverage":[]}