201 lines
11 KiB
JSON
201 lines
11 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-2026-90291",
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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": "2026-09-11T19:38:34.798Z",
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"datePublished": "2026-09-17T16:08:18.700Z",
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"dateUpdated": "2026-10-21T12:50:49.946Z"
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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": "2026-10-21T12:50:49.946Z"
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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\nmodule/dups: Fix use-after-free in kmod_dup_req lifetime handling\n\nThe kmod dups code uses RCU to ensure that a kmod_dup_req instance is freed\nonly after it is no longer referenced. When releasing an instance, the\nkmod_dup_request_delete() function removes the kmod_dup_req from the\ndup_kmod_reqs list, waits via synchronize_rcu() and finally frees it.\nHowever, this doesn't work correctly because parallel users referencing the\ninstance in kmod_dup_request_exists_wait() don't enter an RCU read-side\ncritical section. This can result in a use-after-free.\n\nThe kmod_dup_request_exists_wait() function may need to hold a valid\nreference to a kmod_dup_req instance across a blocking wait until the\ncorresponding modprobe command completes. This makes it unsuitable for RCU.\n\nFix the issue by changing the lifecycle management of kmod_dup_req to use\nreference counting."
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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 UAF is in kmod_dup_request_exists_wait(), reached from __request_module() when tracking a duplicate autoload. An unprivileged process hits that via socket(2) → __sys_socket() → __sock_create(), which calls request_module(\"net-pf-%d\") for an unloaded protocol family; the trigger is that local syscall, not a remote protocol message.\nAC:L - The attacker drives both sides: one socket() call's request_module() inserts a kmod_dup_req and kmod_dup_request_announce() queues kmod_dup_request_delete() for 60*HZ, then further socket() calls look up that entry, drop kmod_dup_mutex, and wait_for_completion_state() on first_req_done without rcu_read_lock, racing the delayed kfree.\nPR:L - __request_module() has no capable() check; it only calls security_kernel_module_request(), whose default LSM hook returns 0. __sock_create()'s request_module(\"net-pf-%d\") path has no capability gate either, so a normal unprivileged local user can trigger the duplicate-autoload race.\nUI:N - The attacker issues their own socket() syscalls to force concurrent request_module() calls for the same net-pf-%d name; no other user must mount a filesystem, open a file, or otherwise cooperate.\nS:U - The use-after-free is of a kmalloc'd kmod_dup_req in kernel/module/dups.c and corrupts host kernel heap. That is a standard in-kernel privilege-escalation impact inside one security authority, not a VM or IOMMU boundary crossing.\nC:H - After kmod_dup_request_delete() kfree()s the kmod_dup_req, a racing kmod_dup_request_exists_wait() still reads kmod_req->dup_ret and takes first_req_done.wait.lock inside wait_for_common(). Reclaiming that slab lets the attacker control those contents, a UAF read primitive.\nI:H - wait_for_common() takes first_req_done.wait.lock and can __prepare_to_swait() onto the completion wait queue in the already-freed kmod_dup_req. Heap spraying that object yields an attacker-controlled wait-queue/list write, a UAF write and control-flow hijack primitive.\nA:H - Using a freed kmod_dup_req's completion spinlock in wait_for_common(), or kfree() racing wait_for_completion_state(&kmod_req->first_req_done), oopses or panics the kernel even without a full exploit."
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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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"kernel/module/dups.c"
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"product": "Linux",
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"defaultStatus": "affected",
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"programFiles": [
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"kernel/module/dups.c"
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],
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"versions": [
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{
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"version": "6.4",
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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": "6.4",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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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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},
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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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},
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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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