{"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"},{"vulnerable":true,"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"}]}]}],"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","x_generator":{"engine":"bippy-1.2.0"}}}}