CVE-2026-89471
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, in the power: supply: cros_usbpd-charger driver cros_usbpd_charger_probe() reads two port counts from the EC and uses num_charger_ports as the loop bound when populating the fixed-size ports[] array of 8 entries. Without validation against EC_USB_PD_MAX_PORTS, a malfunctioning or malicious EC can report up to 255, causing a slab out-of-bounds write. The fix rejects a port count larger than the array can hold.
Risk Assessment
A malicious or faulty EC can trigger an out-of-bounds write in kernel memory, leading to memory corruption, a system crash, or potential privilege escalation.
Recommendation
Update the Linux kernel to a version containing the port count validation fix. Until patched, avoid hardware with untrusted EC firmware.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: power: supply: cros_usbpd-charger: bound the EC-reported port count cros_usbpd_charger_probe() reads two port counts from the EC and uses one of them, num_charger_ports, as the loop bound when populating a fixed-size array: struct port_data *ports[EC_USB_PD_MAX_PORTS]; /* 8 entries */ ... for (i = 0; i < charger->num_charger_ports; i++) charger->ports[charger->num_registered_psy++] = port; Both num_usbpd_ports (from EC_CMD_USB_PD_PORTS) and num_charger_ports (from EC_CMD_CHARGE_PORT_COUNT) are u8 values reported by the EC. The only validation is a sanity check that compares the two EC-reported values against each other: if (num_charger_ports < num_usbpd_ports || num_charger_ports > num_usbpd_ports + 1) return -EPROTO; It never checks either count against EC_USB_PD_MAX_PORTS, the size of the ports[] array. A malfunctioning, malicious or compromised EC that reports num_usbpd_ports == num_charger_ports == N for any N > 8 (for example both 255) passes this check, and the loop then writes N pointers into the 8-entry ports[] array embedded in the devm_kzalloc()'d charger_data, overflowing it by up to 255 - 8 = 247 entries (~1976 bytes): a slab out-of-bounds write. Reject a port count larger than the ports[] array can hold.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS