128 lines
6.0 KiB
JSON
128 lines
6.0 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-10681",
|
|
"assignerOrgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "zephyr",
|
|
"dateReserved": "2026-06-02T15:26:11.951Z",
|
|
"datePublished": "2026-07-25T13:23:07.028Z",
|
|
"dateUpdated": "2026-11-04T04:59:00.937Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
|
|
"shortName": "zephyr",
|
|
"dateUpdated": "2026-11-04T04:59:00.937Z"
|
|
},
|
|
"title": "SMP race in `thread_idx_alloc()` lets concurrent `k_object_alloc(K_OBJ_THREAD)` callers share a kernel-object permission slot",
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In Zephyr's userspace dynamic-objects subsystem, thread_idx_alloc() in kernel/userspace/userspace.c allocated a new thread permission index from the global _thread_idx_map[] bitmap without holding lists_lock.\n\nOn SMP systems, two user-mode threads invoking the k_object_alloc(K_OBJ_THREAD) syscall concurrently can both observe the same low free bit, perform the same non-atomic RMW to clear it, and return the identical tidx.\n\nThe two newly created K_OBJ_THREAD objects are then assigned the same thread_id, so the two user threads alias a single bit position in every kernel object's perms[] bitfield: any subsequent grant of access on a kernel object to one thread is implicitly a grant to the other, defeating userspace ACL isolation. A secondary lost-update window between the unlocked &=~BIT() in alloc and the locked |= BIT() in thread_idx_free() can also leak entries from the thread-index pool.\n\nThe defect is reachable from any user-mode thread via the unrestricted __syscall k_object_alloc and is gated on CONFIG_USERSPACE, CONFIG_DYNAMIC_OBJECTS, and CONFIG_SMP. The flaw was introduced when the per-thread permission index was added in 2018 and is present in every release up to and including v4.4.0. Fixed by holding lists_lock across the bitmap RMW and the permissions clear (and inlining the obj_list traversal that previously took the lock itself)."
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"vendor": "zephyrproject",
|
|
"product": "zephyr",
|
|
"collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
|
|
"packageName": "zephyr",
|
|
"defaultStatus": "unaffected",
|
|
"programFiles": [
|
|
"kernel/userspace/userspace.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "2.0.0",
|
|
"status": "affected",
|
|
"versionType": "semver",
|
|
"lessThan": "4.3.2"
|
|
},
|
|
{
|
|
"version": "4.4.0",
|
|
"status": "affected",
|
|
"versionType": "semver",
|
|
"lessThan": "4.4.2"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://github.com/zephyrproject-rtos/zephyr/commit/862ea2fbbeb2ccdf8ff994b03e2e3b4405f2c37d",
|
|
"name": "Fix commit",
|
|
"tags": [
|
|
"patch"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-j693-5rh5-8g8h",
|
|
"name": "GHSA-j693-5rh5-8g8h"
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"format": "CVSS",
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
|
|
"baseScore": 6.5,
|
|
"baseSeverity": "MEDIUM"
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"description": "race",
|
|
"cweId": "CWE-362",
|
|
"type": "CWE"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"x_generator": {
|
|
"engine": "cvelib 1.8.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"timestamp": "2026-07-27T14:34:32.663266Z",
|
|
"id": "CVE-2026-10681",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"role": "CISA Coordinator",
|
|
"version": "2.0.3"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-07-27T14:34:43.843Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |