{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89470", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.710Z", "datePublished": "2026-09-11T19:43:29.206Z", "dateUpdated": "2026-10-19T08:47:19.356Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:19.356Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: cros_usbpd: Limit port counts to EC_USB_PD_MAX_PORTS\n\nCurrently the cros_usbpd-charger driver probe iterates based on raw\ncharger port count returned by the embedded controller. The only check\nis against the number of USB PD ports which the embedded controller\nalso defines. A malicious embedded controller could return an inaccurate\nport count (up to 255) resulting in an out of bounds write and\nsubsequent memory corruption.\n\nUpdate helper functions in cros_usbpd-charger to limit port counts to\nEC_USB_PD_MAX_PORTS." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The OOB write is in cros_usbpd_charger_probe() on the Chrome OS EC platform path (LPC/eSPI/I2C/SPI/UART/ISHTP → cros_ec_cmd_xfer_status → MFD cell cros-usbpd-charger). Port counts come from the onboard EC, not from network packets or a USB-C partner, so the highest defensible vector is local.\nAC:L - A malicious or compromised EC fully controls both u8 replies (EC_CMD_USB_PD_PORTS and EC_CMD_CHARGE_PORT_COUNT). Setting them equal and greater than 8 (for example both 255) passes the relative sanity check and makes the probe loop overflow ports[EC_USB_PD_MAX_PORTS] deterministically, with no race or layout lottery.\nPR:N - ec_device_probe() auto-adds the charger cell when the EC advertises USB-PD and probe then trusts EC replies with no Linux capability or credential check. Supply-chain or already-compromised EC firmware needs no host account, matching other firmware-at-probe kernel CNA scores.\nUI:N - The charger driver probes automatically during Chrome OS EC MFD bring-up at boot or module load. No victim action such as plugging a cable, mounting a filesystem, or opening a device node is required.\nS:U - Impact is kernel slab corruption and possible code execution on the same host that runs the charger driver. This is not a VM escape, IOMMU/DMA boundary bypass, or other cross-authority breakout.\nC:H - The probe writes up to 247 pointers past the 8-entry ports[] array in the kmalloc'd charger_data (about 1976 bytes on 64-bit), corrupting adjacent slab objects. That heap overflow can be turned into an arbitrary-read primitive, not a small bounded leak.\nI:H - The overflow stores attacker-timed port_data pointers past ports[] (and can also overflow each port's name[] via sprintf for i>=10), enabling adjacent-object corruption, control-flow hijack, and arbitrary write.\nA:H - Smashing charger_data's trailing notifier_block and neighboring slab objects during probe can oops or panic the kernel on Chromebooks and other Chrome OS EC systems, a full availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/power/supply/cros_usbpd-charger.c" ], "versions": [ { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "e951b65ef1699439079b723ca5c72cbe44771647", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "3ce9218639ff62d011eb8aca0943aa670a654c7b", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "dce1750ddbd3380b1f6090dda2b07d2ebea2261d", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "3262977a05b23d1be9fc86727a2b490ec997543e", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "fd5f289cca04ad869b34fc9ccb647670bfdb60ac", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "4b1f2be1e1b74a50386ba718de3d62bfcf5ee701", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "304a29ac55ba3ee6eceaf7d83d09cd9709f3bf60", "status": "affected", "versionType": "git" }, { "version": "3af15cfacd1eef7f223802d49a88cae23c509183", "lessThan": "657cd3a42e937276262c0a8ae6b01a87004309de", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/power/supply/cros_usbpd-charger.c" ], "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e951b65ef1699439079b723ca5c72cbe44771647" }, { "url": "https://git.kernel.org/stable/c/3ce9218639ff62d011eb8aca0943aa670a654c7b" }, { "url": "https://git.kernel.org/stable/c/dce1750ddbd3380b1f6090dda2b07d2ebea2261d" }, { "url": "https://git.kernel.org/stable/c/3262977a05b23d1be9fc86727a2b490ec997543e" }, { "url": "https://git.kernel.org/stable/c/fd5f289cca04ad869b34fc9ccb647670bfdb60ac" }, { "url": "https://git.kernel.org/stable/c/4b1f2be1e1b74a50386ba718de3d62bfcf5ee701" }, { "url": "https://git.kernel.org/stable/c/304a29ac55ba3ee6eceaf7d83d09cd9709f3bf60" }, { "url": "https://git.kernel.org/stable/c/657cd3a42e937276262c0a8ae6b01a87004309de" } ], "title": "power: supply: cros_usbpd: Limit port counts to EC_USB_PD_MAX_PORTS", "x_generator": { "engine": "bippy-1.2.0" } } } }