{"id":"CVE-2026-89471","summary":"power: supply: cros_usbpd-charger: bound the EC-reported port count","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: cros_usbpd-charger: bound the EC-reported port count\n\ncros_usbpd_charger_probe() reads two port counts from the EC and uses\none of them, num_charger_ports, as the loop bound when populating a\nfixed-size array:\n\n\tstruct port_data *ports[EC_USB_PD_MAX_PORTS];\t/* 8 entries */\n\t...\n\tfor (i = 0; i \u003c charger-\u003enum_charger_ports; i++)\n\t\tcharger-\u003eports[charger-\u003enum_registered_psy++] = port;\n\nBoth num_usbpd_ports (from EC_CMD_USB_PD_PORTS) and num_charger_ports\n(from EC_CMD_CHARGE_PORT_COUNT) are u8 values reported by the EC. The\nonly validation is a sanity check that compares the two EC-reported\nvalues against each other:\n\n\tif (num_charger_ports \u003c num_usbpd_ports ||\n\t    num_charger_ports \u003e num_usbpd_ports + 1)\n\t\treturn -EPROTO;\n\nIt never checks either count against EC_USB_PD_MAX_PORTS, the size of\nthe ports[] array. A malfunctioning, malicious or compromised EC that\nreports num_usbpd_ports == num_charger_ports == N for any N \u003e 8 (for\nexample both 255) passes this check, and the loop then writes N pointers\ninto the 8-entry ports[] array embedded in the devm_kzalloc()'d\ncharger_data, overflowing it by up to 255 - 8 = 247 entries (~1976\nbytes): a slab out-of-bounds write.\n\nReject a port count larger than the ports[] array can hold.","modified":"2026-09-13T03:47:18.184852079Z","published":"2026-09-11T19:43:29.867Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89471.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3d1e01443b221081258ff34ea0cdd0431e4ff62e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/48355ce49359740f52e94d3623f6fc557ce341f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78be8b7403ff7638162438b664a07d19da76059e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd29d08ee487f3bf50f2575aaa74f78a74b09b21"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89471.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89471"},{"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":"f68b883e8fad23ed0ac4756d91594809d78678ed"},{"fixed":"fd29d08ee487f3bf50f2575aaa74f78a74b09b21"},{"fixed":"78be8b7403ff7638162438b664a07d19da76059e"},{"fixed":"3d1e01443b221081258ff34ea0cdd0431e4ff62e"},{"fixed":"48355ce49359740f52e94d3623f6fc557ce341f0"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89471.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89471.json"}}],"schema_version":"1.9.0"}