power: supply: cros_usbpd-charger: bound the EC-reported port count

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Summary

CVECVE-2026-89471
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:28 UTC
Updated2026-09-11 20:19:28 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f68b883e8fad23ed0ac4756d91594809d78678ed fd29d08ee487f3bf50f2575aaa74f78a74b09b21 git Not specified
CNA Linux Linux affected f68b883e8fad23ed0ac4756d91594809d78678ed 78be8b7403ff7638162438b664a07d19da76059e git Not specified
CNA Linux Linux affected f68b883e8fad23ed0ac4756d91594809d78678ed 3d1e01443b221081258ff34ea0cdd0431e4ff62e git Not specified
CNA Linux Linux affected f68b883e8fad23ed0ac4756d91594809d78678ed 48355ce49359740f52e94d3623f6fc557ce341f0 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/78be8b7403ff7638162438b664a07d19da76059e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d1e01443b221081258ff34ea0cdd0431e4ff62e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd29d08ee487f3bf50f2575aaa74f78a74b09b21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48355ce49359740f52e94d3623f6fc557ce341f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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