180 lines
10 KiB
JSON
180 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90402",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.811Z",
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"datePublished": "2026-09-17T16:09:32.194Z",
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"dateUpdated": "2026-10-19T09:03:06.272Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:03:06.272Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbus: mhi: host: Fix controller cleanup on EDL sysfs failure\n\nmhi_register_controller() adds the controller device before creating the\noptional trigger_edl sysfs file. If sysfs_create_file() fails, the error\npath only drops the device reference and leaves the device registered.\n\nHence, call device_del() in the error path before put_device()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The missing device_del() is in mhi_register_controller() after device_add(), reached from mhi_pci_probe() for EDL-capable PCI WWAN controllers that set edl_trigger (Qualcomm SDX/QDU). The leftover mhi_dev is then opened via local sysfs; sysfs_create_file(trigger_edl) is not fed by a remote protocol message.\nAC:H - The broken err_release_dev path runs only when sysfs_create_file(&mhi_dev->dev.kobj, &dev_attr_trigger_edl.attr) fails after device_add() succeeded. That helper fails on kernfs errors such as -ENOMEM; a later mhi_pci_probe retries device_add(\"mhi%d\") and gets -EEXIST instead, so the attacker cannot reliably re-enter this exact failure.\nPR:L - device_add() installs mhi_dev_groups before trigger_edl is created, so serial_number and oem_pk_hash exist as DEVICE_ATTR_RO (0444) on /sys/bus/mhi/devices/mhiN/. After probe failure those files remain; an unprivileged local user can read them with no CAP_SYS_ADMIN and no user-namespace capability.\nUI:N - The attacker reads the leftover /sys/bus/mhi/devices/mhiN/serial_number or oem_pk_hash (or writes soc_reset) themselves. No second user must plug the WWAN card, mount media, or confirm a prompt.\nS:U - On the failed mhi_pci_probe(), device_unbind_cleanup() frees mhi_pdev via devres_release_all() while the still-registered mhi_dev stays a child of the PCI device. That is a host-kernel use-after-free of struct mhi_controller, not a VM, IOMMU, or sandbox escape.\nC:H - Without device_del(), mhi_dev remains in sysfs with mhi_dev->mhi_cntrl pointing at mhi_pdev freed on probe failure. serial_number_show reads mhi_cntrl->serial_number from that freed object, and oem_pk_hash_show calls mhi_read_reg() on it, disclosing kernel memory.\nI:H - oem_pk_hash_show calls mhi_read_reg(), which invokes the freed mhi_cntrl->read_reg function pointer; soc_reset_store calls mhi_soc_reset() which uses mhi_cntrl->write_reg/reset. Replacing the freed struct mhi_controller yields an arbitrary call/write primitive for control-flow hijack.\nA:H - serial_number_show, oem_pk_hash_show, and soc_reset_store dereference the dangling mhi_cntrl and oops or panic. The leaked device also keeps the mhiN name while ida_free() reuses the index, so a later mhi_register_controller() device_add() fails until reboot."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/bus/mhi/host/init.c"
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],
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"versions": [
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{
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"version": "17553ba8e19dee8770b3dcc597d49dcc3418f3b0",
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"lessThan": "7943dc67250fad6ceac0dd089c6ad5776e4be71d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "17553ba8e19dee8770b3dcc597d49dcc3418f3b0",
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"lessThan": "4fb17a7c437f145353e93e6a9791f6db70e1cc63",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "17553ba8e19dee8770b3dcc597d49dcc3418f3b0",
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"lessThan": "4743959aa8d876b5b456a62e8a62eb770db7afe9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "17553ba8e19dee8770b3dcc597d49dcc3418f3b0",
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"lessThan": "0d5b9e66591d4e2a4376ac82c8cda889a29ba3ee",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/bus/mhi/host/init.c"
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],
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"versions": [
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{
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"version": "6.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.110",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.12.110"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.18.52"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7943dc67250fad6ceac0dd089c6ad5776e4be71d"
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},
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{
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"url": "https://git.kernel.org/stable/c/4fb17a7c437f145353e93e6a9791f6db70e1cc63"
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},
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{
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"url": "https://git.kernel.org/stable/c/4743959aa8d876b5b456a62e8a62eb770db7afe9"
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},
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{
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"url": "https://git.kernel.org/stable/c/0d5b9e66591d4e2a4376ac82c8cda889a29ba3ee"
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}
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],
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"title": "bus: mhi: host: Fix controller cleanup on EDL sysfs failure",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |