{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-38087",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T04:51:23.982Z",
        "datePublished": "2025-06-30T07:29:43.325Z",
        "dateUpdated": "2026-08-05T11:59:24.523Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T11:59:24.523Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "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."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/sch_taprio.c"
                    ],
                    "versions": [
                        {
                            "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
                            "lessThan": "8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
                            "lessThan": "8a008c89e5e5c5332e4c0a33d707db9ddd529f8a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
                            "lessThan": "b1547d28ba468bc3b88764efd13e4319bab63be8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
                            "lessThan": "b160766e26d4e2e2d6fe2294e0b02f92baefcec5",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/sch_taprio.c"
                    ],
                    "versions": [
                        {
                            "version": "6.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.95",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.35",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.15.4",
                            "lessThanOrEqual": "6.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.3",
                                    "versionEndExcluding": "6.6.95"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.3",
                                    "versionEndExcluding": "6.12.35"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.3",
                                    "versionEndExcluding": "6.15.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.3",
                                    "versionEndExcluding": "6.16"
                                }
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8a008c89e5e5c5332e4c0a33d707db9ddd529f8a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b1547d28ba468bc3b88764efd13e4319bab63be8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b160766e26d4e2e2d6fe2294e0b02f92baefcec5"
                }
            ],
            "title": "net/sched: fix use-after-free in taprio_dev_notifier",
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    }
}