{"id":"CVE-2026-89587","revision":"77282a8c58b34364bc6c0cffea955ca0","records":[{"revision":"77282a8c58b34364bc6c0cffea955ca0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89587","aliases":[],"title":"ACPI: pfr_update: fix stack buffer overflow in query_capability()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: pfr_update: fix stack buffer overflow in query_capability()\n\nquery_capability() copies four ACPI buffer objects returned by the\nfirmware _DSM into fixed-size u8[16] fields in struct\npfru_update_cap_info using memcpy with the firmware-supplied length:\n\n  memcpy(&cap_hdr->code_type,\n         elements[CAP_CODE_TYPE_IDX].buffer.pointer,\n         elements[CAP_CODE_TYPE_IDX].buffer.length);\n\nThe same pattern repeats for drv_type, platform_id, and oem_id.\nIf the firmware returns buffer.length > 16 for any of these fields,\nmemcpy writes past the destination array.\n\nstruct pfru_update_cap_info is stack-allocated in pfru_ioctl().\n\nConfirmed with KASAN on 7.2-rc6: three stack-out-of-bounds reports\nare generated when a DSM returns 64-byte buffers, with writes reaching\n44 bytes past the end of cap_hdr's [64, 156) frame window into\nadjacent stack redzones.\n\nIntroduce a helper pointer to out_obj->package.elements and use it\nto validate each buffer length against its destination field size\nbefore copying, returning -EINVAL if the firmware supplies an\noversized buffer.","state":0,"publishedAt":"2026-09-11T19:44:52.066+00:00","modifiedAt":"2026-10-19T08:49:19.962+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/acpi/pfr_update.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0db89fa243e5edc5de38c88b369e4c3755c5fb74\",\n                            \"lessThan\": \"d3af83e327565a9444cebc0db714cb837e493046\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0db89fa243e5edc5de38c88b369e4c3755c5fb74\",\n                            \"lessThan\": \"c5a31b4e7e37c92550be9a2edf51ca853a4d251a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0db89fa243e5edc5de38c88b369e4c3755c5fb74\",\n                            \"lessThan\": \"a2151624b55029dad0ca7efd17fb83a0461c8843\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0db89fa243e5edc5de38c88b369e4c3755c5fb74\",\n                            \"lessThan\": \"6d4ed2fd022bc862b156e53aae163b61259e1caa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0db89fa243e5edc5de38c88b369e4c3755c5fb74\",\n                            \"lessThan\": \"15d2b7f38f95d28652170344f39ee492c55e567c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0db89fa243e5edc5de38c88b369e4c3755c5fb74\",\n                            \"lessThan\": \"ced45be0073a8a31b30b4a7f68cd3a15734515de\",\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/acpi/pfr_update.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\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/d3af83e327565a9444cebc0db714cb837e493046","https://git.kernel.org/stable/c/c5a31b4e7e37c92550be9a2edf51ca853a4d251a","https://git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843","https://git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa","https://git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c","https://git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89587","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89587","identifiers":["CVE-2026-89587"]},"retained":false,"historicalAffected":[]}],"coverage":[]}