451 lines
23 KiB
JSON
451 lines
23 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-2025-39977",
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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": "2025-04-16T07:20:57.150Z",
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"datePublished": "2025-10-15T07:55:58.283Z",
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"dateUpdated": "2026-11-10T12:37:24.327Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:06:46.111Z"
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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\nfutex: Prevent use-after-free during requeue-PI\n\nsyzbot managed to trigger the following race:\n\n T1 T2\n\n futex_wait_requeue_pi()\n futex_do_wait()\n schedule()\n futex_requeue()\n futex_proxy_trylock_atomic()\n futex_requeue_pi_prepare()\n requeue_pi_wake_futex()\n futex_requeue_pi_complete()\n /* preempt */\n\n * timeout/ signal wakes T1 *\n\n futex_requeue_pi_wakeup_sync() // Q_REQUEUE_PI_LOCKED\n futex_hash_put()\n // back to userland, on stack futex_q is garbage\n\n /* back */\n wake_up_state(q->task, TASK_NORMAL);\n\nIn this scenario futex_wait_requeue_pi() is able to leave without using\nfutex_q::lock_ptr for synchronization.\n\nThis can be prevented by reading futex_q::task before updating the\nfutex_q::requeue_state. A reference on the task_struct is not needed\nbecause requeue_pi_wake_futex() is invoked with a spinlock_t held which\nimplies a RCU read section.\n\nEven if T1 terminates immediately after, the task_struct will remain valid\nduring T2's wake_up_state(). A READ_ONCE on futex_q::task before\nfutex_requeue_pi_complete() is enough because it ensures that the variable\nis read before the state is updated.\n\nRead futex_q::task before updating the requeue state, use it for the\nfollowing wakeup."
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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 race is driven entirely through the futex(2) syscall (FUTEX_WAIT_REQUEUE_PI on one thread, FUTEX_CMP_REQUEUE_PI on another), which requires local execution on the target system. There is no remote or adjacent-network path into kernel/futex/requeue.c.\nAC:L - The attacker controls both sides of the race: it creates the waiter thread with an attacker-chosen short timeout (or delivers a signal) and simultaneously issues the requeue from a second thread, and can retry the loop millions of times with CPU pinning and interrupt pressure to hit the window between futex_requeue_pi_complete() and wake_up_state(). syzbot hit it with random fuzzing, and on PREEMPT_RT the hb spinlock_t is preemptible, making the window wide.\nPR:L - Any unprivileged local user can call futex() with FUTEX_WAIT_REQUEUE_PI/FUTEX_CMP_REQUEUE_PI; do_futex() and futex_requeue() contain no capability or credential checks, and CONFIG_FUTEX_PI is default-y. The path is reachable from inside containers and sandboxes with no elevated privileges.\nUI:N - The attacker's own two threads perform every step of the exploit; no victim action, mount, or file open is involved.\nS:U - The corruption occurs in kernel memory (a stale kernel stack frame and a type-confused task_struct) and stays within the kernel's own security authority. No VM, IOMMU, or hypervisor boundary is crossed.\nC:H - This is a use-after-free read of the waiter's dead kernel stack frame, and the resulting attacker-influenced task_struct pointer is dereferenced in try_to_wake_up() (p->__state, p->saved_state, p->on_rq, p->sched_class), giving an arbitrary kernel-memory read/oracle primitive. Per UAF guidance this is High.\nI:H - The stale futex_q lives on the attacker's own kernel stack, which can be refilled with controlled bytes by an immediately following syscall, so q->task becomes an attacker-chosen pointer; try_to_wake_up() then writes to it (raw_spin_lock on p->pi_lock, WRITE_ONCE(p->__state, TASK_RUNNING), runqueue list manipulation) and makes an indirect call through p->sched_class->enqueue_task(), a plausible local privilege-escalation path.\nA:H - In the unexploited case wake_up_state() dereferences a wild pointer from reused stack memory, causing an immediate oops/panic, and corrupting scheduler runqueue state can hang the machine. Any use-after-free of this kind is a High availability impact."
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}
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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": "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/futex/requeue.c"
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"kernel/futex/requeue.c"
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],
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"version": "0",
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"status": "unaffected",
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"lessThanOrEqual": "6.1.*",
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},
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{
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{
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"status": "unaffected",
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},
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{
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"status": "unaffected",
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},
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"version": "6.17",
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"url": "https://git.kernel.org/stable/c/348736955ed6ca6e99ca24b93b1d3fbfe352c181"
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{
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}
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],
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"title": "futex: Prevent use-after-free during requeue-PI",
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{
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-11-10T12:37:24.327Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
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},
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
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},
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-39977",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:55:38.918885Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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} |