{"id":"CVE-2026-89471","revision":"ecc5dcd13a6d4952906bb2d514573a6a","records":[{"revision":"ecc5dcd13a6d4952906bb2d514573a6a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89471","aliases":[],"title":"power: supply: cros_usbpd-charger: bound the EC-reported port count","description":"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 < charger->num_charger_ports; i++)\n\t\tcharger->ports[charger->num_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 < num_usbpd_ports ||\n\t    num_charger_ports > 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 > 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.","state":0,"publishedAt":"2026-09-11T19:43:29.867+00:00","modifiedAt":"2026-10-19T08:47:20.319+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/power/supply/cros_usbpd-charger.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"0b5096f6804161b61451b1cec0e38678630be849\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"c46c9f447415ca802afab51dea1eafc08ddff1c6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"a1905375dfc0b9612bbee52fc066e3a70c0d671d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"2746d502b12b343384fb747bdef9cbcfbd7444a2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"fd29d08ee487f3bf50f2575aaa74f78a74b09b21\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"78be8b7403ff7638162438b664a07d19da76059e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"3d1e01443b221081258ff34ea0cdd0431e4ff62e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f68b883e8fad23ed0ac4756d91594809d78678ed\",\n                            \"lessThan\": \"48355ce49359740f52e94d3623f6fc557ce341f0\",\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/power/supply/cros_usbpd-charger.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\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:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0b5096f6804161b61451b1cec0e38678630be849","https://git.kernel.org/stable/c/c46c9f447415ca802afab51dea1eafc08ddff1c6","https://git.kernel.org/stable/c/a1905375dfc0b9612bbee52fc066e3a70c0d671d","https://git.kernel.org/stable/c/2746d502b12b343384fb747bdef9cbcfbd7444a2","https://git.kernel.org/stable/c/fd29d08ee487f3bf50f2575aaa74f78a74b09b21","https://git.kernel.org/stable/c/78be8b7403ff7638162438b664a07d19da76059e","https://git.kernel.org/stable/c/3d1e01443b221081258ff34ea0cdd0431e4ff62e","https://git.kernel.org/stable/c/48355ce49359740f52e94d3623f6fc557ce341f0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89471","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89471","identifiers":["CVE-2026-89471"]},"retained":false,"historicalAffected":[]}],"coverage":[]}