332 lines
17 KiB
JSON
332 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-35785",
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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": "2024-05-17T12:19:12.338Z",
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"datePublished": "2024-05-17T12:24:28.069Z",
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"dateUpdated": "2026-08-05T11:29:53.994Z"
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},
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"dateUpdated": "2026-08-05T11:29:53.994Z"
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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\ntee: optee: Fix kernel panic caused by incorrect error handling\n\nThe error path while failing to register devices on the TEE bus has a\nbug leading to kernel panic as follows:\n\n[ 15.398930] Unable to handle kernel paging request at virtual address ffff07ed00626d7c\n[ 15.406913] Mem abort info:\n[ 15.409722] ESR = 0x0000000096000005\n[ 15.413490] EC = 0x25: DABT (current EL), IL = 32 bits\n[ 15.418814] SET = 0, FnV = 0\n[ 15.421878] EA = 0, S1PTW = 0\n[ 15.425031] FSC = 0x05: level 1 translation fault\n[ 15.429922] Data abort info:\n[ 15.432813] ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000\n[ 15.438310] CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[ 15.443372] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[ 15.448697] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000d9e3e000\n[ 15.455413] [ffff07ed00626d7c] pgd=1800000bffdf9003, p4d=1800000bffdf9003, pud=0000000000000000\n[ 15.464146] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP\n\nCommit 7269cba53d90 (\"tee: optee: Fix supplicant based device enumeration\")\nlead to the introduction of this bug. So fix it appropriately."
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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:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 vulnerable code is reached only by opening the local character device /dev/teepriv0, which schedules optee_bus_scan() → optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP); there is no network or remote-peer input anywhere on the path.\nAC:L - On an affected platform the device_register() failure is deterministic (the reporter hit the panic on every boot at ~15s), so an attacker who triggers the supplicant enumeration reliably lands on the use-after-free; the freed slab object is a generic GFP_KERNEL kmalloc allocation that can be sprayed from userspace, and the failure can additionally be induced via attacker-generated memory pressure (-ENOMEM in kobject_add/kernfs).\nPR:L - The kernel imposes no capability or permission check in tee_open()/optee_open() for the privileged node — access is governed purely by udev/DAC, and OP-TEE's shipped rules expose teepriv[0-9]* at mode 0660 with a group plus TAG+=\"uaccess\", so an ordinary local user in the teepriv group or at the local seat can open it and trigger the scan.\nUI:N - The attacker opens /dev/teepriv0 themselves to schedule the bus-scan work; no victim action is required, and in the natural case the crash occurs unattended when the tee-supplicant system daemon starts at boot.\nS:U - The freed object and all corrupted structures (struct tee_client_device, kobject, kernfs nodes) live in normal kernel memory under the same security authority; nothing crosses into the secure world, a hypervisor, or an IOMMU boundary.\nC:H - The use-after-free dereferences attacker-groomable freed memory through a chain of pointers (kobj->sd → parent->priv → kobj->ktype->sysfs_ops), giving a controllable read primitive over arbitrary kernel addresses once the slab object is reallocated with attacker data.\nI:H - The same UAF drives __kernfs_create_file() and kobject_get_ownership() through attacker-controlled pointers, producing writes into attacker-chosen addresses (kernfs rbtree links, parent->dir.subdirs) and an indirect call via ktype->get_ownership — sufficient for control-flow hijack and privilege escalation.\nA:H - The bug is a confirmed kernel panic (Oops with a level-1 translation fault in the optee_bus_scan kworker), and on affected platforms it reproduces every boot, rendering the system unusable."
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}
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