{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50127", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.954Z", "datePublished": "2024-11-05T17:10:54.385Z", "dateUpdated": "2026-08-05T11:41:53.116Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:53.116Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix use-after-free in taprio_change()\n\nIn 'taprio_change()', 'admin' pointer may become dangling due to sched\nswitch / removal caused by 'advance_sched()', and critical section\nprotected by 'q->current_entry_lock' is too small to prevent from such\na scenario (which causes use-after-free detected by KASAN). Fix this\nby prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update\n'admin' immediately before an attempt to schedule freeing." } ], "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 vulnerability is reached through the tc/qdisc netlink configuration interface (RTM_NEWQDISC/RTM_CHANGEQDISC on the taprio qdisc), which requires local system access to open an AF_NETLINK socket. No remote packet processing path reaches taprio_change().\nAC:L - The attacker controls both sides of the race: the schedule's base-time, cycle-time and per-entry intervals determine precisely when advance_sched() fires and promotes the admin schedule, while a large gate-control list arbitrarily widens the unlocked parse window in taprio_change(). advance_sched() takes neither rtnl nor qdisc_lock, so nothing serializes it, and syzkaller reproduced the UAF by fuzzing alone.\nPR:L - tc_modify_qdisc is gated only by netlink_net_capable(skb, CAP_NET_ADMIN), which is namespace-aware, so an unprivileged user can obtain it via `unshare -Urn` and then create a multiqueue dummy/veth device to host the taprio qdisc. Per kernel scoring convention, CAP_NET_ADMIN reachable through user namespaces is Low, not High.\nUI:N - The attacker performs every step alone — creating the netns, the multiqueue device, the taprio qdisc, and issuing the two racing schedule changes. No victim action is involved.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no crossing of a hypervisor, IOMMU, or other distinct security boundary.\nC:H - Freeing the live sched_gate_list while q->oper_sched still points at it lets the attacker reclaim the kmalloc-512 allocation with a controlled object that the dequeue/dump paths then read, and the double-free plus list walk over reallocated memory yields primitives capable of arbitrary kernel memory disclosure.\nI:H - advance_sched() writes 64-bit attacker-influenced values (cycle_end_time, end_time, gate_close_time[], budgets) at known offsets into the freed objects, and taprio_free_sched_cb() later performs list_del writes and kfree() on pointers read from reallocated memory — an arbitrary-write/arbitrary-free chain suitable for privilege escalation.\nA:H - The use-after-free and subsequent double free of the operational schedule reliably corrupt the slab allocator and panic the kernel (KASAN-detected), and the attacker can trigger it repeatedly, taking down TSN-critical automotive and industrial systems where taprio is deployed." } ] } ], "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": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "2f868ce6013548a713c431c679ef73747a66fcf3", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "8a283a19026aaae8a773fd8061263cfa315b127f", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "999612996df28d81f163dad530d7f8026e03aec6", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "fe371f084073e8672a2d7d46b335c3c060d1e301", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "0d4c0d2844e4eac3aed647f948fd7e60eea56a61", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "2240f9376f20f8b6463232b4ca7292569217237f", "status": "affected", "versionType": "git" }, { "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "f504465970aebb2467da548f7c1efbbf36d0f44b", "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": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.285", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.229", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.170", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.115", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.59", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.6", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "5.2", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.10.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.15.170" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.1.115" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.11.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2f868ce6013548a713c431c679ef73747a66fcf3" }, { "url": "https://git.kernel.org/stable/c/8a283a19026aaae8a773fd8061263cfa315b127f" }, { "url": "https://git.kernel.org/stable/c/999612996df28d81f163dad530d7f8026e03aec6" }, { "url": "https://git.kernel.org/stable/c/fe371f084073e8672a2d7d46b335c3c060d1e301" }, { "url": "https://git.kernel.org/stable/c/0d4c0d2844e4eac3aed647f948fd7e60eea56a61" }, { "url": "https://git.kernel.org/stable/c/2240f9376f20f8b6463232b4ca7292569217237f" }, { "url": "https://git.kernel.org/stable/c/f504465970aebb2467da548f7c1efbbf36d0f44b" } ], "title": "net: sched: fix use-after-free in taprio_change()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50127", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2024-12-11T14:28:21.328657Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-12-11T14:58:33.392Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:25:48.715Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:00:16.499Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" } ] } ] } }