{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89471","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.710Z","datePublished":"2026-09-11T19:43:29.867Z","dateUpdated":"2026-09-14T12:00:08.543Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-14T12:00:08.543Z"},"descriptions":[{"lang":"en","value":"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."}],"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 overflow is in cros_usbpd_charger_probe(), reached when the Chrome OS EC MFD core instantiates the charger over LPC/eSPI/I2C/SPI and the driver reads EC_CMD_USB_PD_PORTS and EC_CMD_CHARGE_PORT_COUNT; USB-C PD is handled by the EC and there is no network or USB-packet path into this probe.\nAC:L - A malicious or compromised EC fully controls the two u8 port counts; reporting equal values N>8 (for example both 255) passes the mutual sanity check and deterministically writes N pointers past the 8-entry ports[] array with no race or attacker-uncontrollable layout.\nPR:N - The vulnerable probe runs automatically at boot when the CrOS EC advertises USB-PD; no Linux account, capability, or user-namespace privilege is required because the attacker is the EC supplying host-command responses, with no authentication on this path.\nUI:N - Driver enumeration and the overflowing registration loop execute during normal kernel boot or module load on Chromebooks, Framework laptops, and other CrOS-EC systems; no victim action such as plugging a peripheral or opening a device node is required.\nS:U - The slab out-of-bounds write corrupts kernel heap belonging to the same OS security authority as the charger driver; this is ordinary kernel memory corruption, not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The loop writes up to 247 kernel pointers (~1976 bytes) past the kmalloc'd charger_data into adjacent slab objects; that heap corruption can be leveraged for kernel-memory disclosure.\nI:H - This is a slab out-of-bounds write of port_data pointers that smashes charger_data.notifier (including notifier_call) and neighboring heap objects, which is exploitable for control-flow hijacking.\nA:H - Overflowing the 8-entry ports[] array by hundreds of pointer writes corrupts SLUB metadata and adjacent objects and can oops or panic the kernel during probe."}]}],"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":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"0b5096f6804161b61451b1cec0e38678630be849","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"c46c9f447415ca802afab51dea1eafc08ddff1c6","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"a1905375dfc0b9612bbee52fc066e3a70c0d671d","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"2746d502b12b343384fb747bdef9cbcfbd7444a2","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"fd29d08ee487f3bf50f2575aaa74f78a74b09b21","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"78be8b7403ff7638162438b664a07d19da76059e","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"3d1e01443b221081258ff34ea0cdd0431e4ff62e","status":"affected","versionType":"git"},{"version":"f68b883e8fad23ed0ac4756d91594809d78678ed","lessThan":"48355ce49359740f52e94d3623f6fc557ce341f0","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":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","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-rc1","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":"4.19","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0b5096f6804161b61451b1cec0e38678630be849"},{"url":"https://git.kernel.org/stable/c/c46c9f447415ca802afab51dea1eafc08ddff1c6"},{"url":"https://git.kernel.org/stable/c/a1905375dfc0b9612bbee52fc066e3a70c0d671d"},{"url":"https://git.kernel.org/stable/c/2746d502b12b343384fb747bdef9cbcfbd7444a2"},{"url":"https://git.kernel.org/stable/c/fd29d08ee487f3bf50f2575aaa74f78a74b09b21"},{"url":"https://git.kernel.org/stable/c/78be8b7403ff7638162438b664a07d19da76059e"},{"url":"https://git.kernel.org/stable/c/3d1e01443b221081258ff34ea0cdd0431e4ff62e"},{"url":"https://git.kernel.org/stable/c/48355ce49359740f52e94d3623f6fc557ce341f0"}],"title":"power: supply: cros_usbpd-charger: bound the EC-reported port count","x_generator":{"engine":"bippy-1.2.0"}}}}