180 lines
9.5 KiB
JSON
180 lines
9.5 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-2025-38087",
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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": "2025-04-16T04:51:23.982Z",
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"datePublished": "2025-06-30T07:29:43.325Z",
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"dateUpdated": "2026-08-05T11:59:24.523Z"
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},
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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": "2026-08-05T11:59:24.523Z"
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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\nnet/sched: fix use-after-free in taprio_dev_notifier\n\nSince taprio’s taprio_dev_notifier() isn’t protected by an\nRCU read-side critical section, a race with advance_sched()\ncan lead to a use-after-free.\n\nAdding rcu_read_lock() inside taprio_dev_notifier() prevents this."
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"baseScore": 7.8,
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},
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is reached by configuring a taprio qdisc and triggering netdev notifier events via rtnetlink/netlink from the local system. Per kernel guidance, tc/netlink qdisc bugs are Local.\nAC:L - The attacker controls both sides of the race — the schedule cycle time (driving advance_sched()'s call_rcu() free at ~48µs intervals) and the NETDEV_UP/NETDEV_CHANGE events that re-enter the unprotected notifier — and can retry indefinitely, with the window widened further on the PREEMPT/PREEMPT_RT kernels typical of TSN deployments.\nPR:L - Only CAP_NET_ADMIN within a network namespace is needed, which any unprivileged user obtains via `unshare -Urn` since rtnetlink uses namespace-scoped netlink_net_capable(); the required multiqueue device is created as a veth with IFLA_NUM_TX_QUEUES.\nUI:N - The attacker performs all steps — qdisc creation, schedule replacement, and link state changes — entirely on their own. No victim action is involved.\nS:U - The corruption is confined to kernel heap memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free reads max_open_gate_duration[] and cycle_time from a freed, attacker-sprayable kmalloc-512 object, and with heap grooming a UAF of this kind yields an arbitrary kernel memory read primitive.\nI:H - taprio_update_queue_max_sdu() writes 32 attacker-influenced u32 values (derived from the user-supplied TCA_TAPRIO_TC_ENTRY_MAX_SDU) into fixed offsets 128–255 of the freed object, giving a controlled-value write into a reclaimed general-purpose slab object that is exploitable for control-flow hijacking.\nA:H - The use-after-free corrupts arbitrary reclaimed kernel objects and reliably causes oops/panic, and the race can be re-triggered in a loop for repeated crashes."
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}
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]
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}
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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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"net/sched/sch_taprio.c"
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},
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{
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"lessThanOrEqual": "6.15.*",
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"versionType": "semver"
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},
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"version": "6.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"references": [
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"url": "https://git.kernel.org/stable/c/8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c"
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}
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"title": "net/sched: fix use-after-free in taprio_dev_notifier",
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