CVE-2024-50127

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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 \u2014 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 \u2014 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", 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"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": "2026-10-15T00:57:08.737Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "V1.1.1", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}]}]}}

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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 \u2014 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 \u2014 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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "2f868ce6013548a713c431c679ef73747a66fcf3", "versionType": "git"}, {"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "8a283a19026aaae8a773fd8061263cfa315b127f", "versionType": "git"}, {"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "999612996df28d81f163dad530d7f8026e03aec6", "versionType": "git"}, {"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "fe371f084073e8672a2d7d46b335c3c060d1e301", "versionType": "git"}, {"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "0d4c0d2844e4eac3aed647f948fd7e60eea56a61", "versionType": "git"}, {"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "2240f9376f20f8b6463232b4ca7292569217237f", "versionType": "git"}, {"status": "affected", "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213", "lessThan": "f504465970aebb2467da548f7c1efbbf36d0f44b", "versionType": "git"}], "programFiles": ["net/sched/sch_taprio.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.2"}, {"status": "unaffected", "version": "0", "lessThan": "5.2", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.285", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.229", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.170", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.115", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.59", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.11.6", "versionType": "semver", "lessThanOrEqual": "6.11.*"}, {"status": "unaffected", "version": "6.12", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sched/sch_taprio.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.285", "versionStartIncluding": "5.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.229", "versionStartIncluding": "5.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.170", "versionStartIncluding": "5.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.115", "versionStartIncluding": "5.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.59", "versionStartIncluding": "5.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11.6", "versionStartIncluding": "5.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12", "versionStartIncluding": "5.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:53.116Z"}}}, "cveMetadata": {"cveId": "CVE-2024-50127", "state": "PUBLISHED", "dateUpdated": "2026-10-15T00:57:08.737Z", "dateReserved": "2024-10-21T19:36:19.954Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-11-05T17:10:54.385Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Fix this\nby prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update\n'admin' immediately before an attempt to schedule freeing."}, {"lang": "es", "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: sched: arreglado use-after-free en taprio_change(). En 'taprio_change()', el puntero 'admin' puede quedar colgando debido al cambio/eliminaci\u00f3n de sched causado por 'advance_sched()', y la secci\u00f3n cr\u00edtica protegida por 'q->current_entry_lock' es demasiado peque\u00f1a para evitar tal escenario (que causa el use-after-free detectado por KASAN). Solucione esto al preferir 'rcu_replace_pointer()' sobre 'rcu_assign_pointer()' para actualizar 'admin' inmediatamente antes de un intento de liberaci\u00f3n de programaci\u00f3n."}], "id": "CVE-2024-50127", "lastModified": "2026-10-15T01:19:07.610", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-50127", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-12-11T14:28:21.328657Z", "version": "2.0.3"}}]}, "published": "2024-11-05T18:15:15.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d4c0d2844e4eac3aed647f948fd7e60eea56a61"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2240f9376f20f8b6463232b4ca7292569217237f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f868ce6013548a713c431c679ef73747a66fcf3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a283a19026aaae8a773fd8061263cfa315b127f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/999612996df28d81f163dad530d7f8026e03aec6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f504465970aebb2467da548f7c1efbbf36d0f44b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe371f084073e8672a2d7d46b335c3c060d1e301"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: net: sched: fix use-after-free in taprio_change()", "id": "2323927", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2323927"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: sched: fix use-after-free in taprio_change()\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."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent module sch_taprio from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2024-50127", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-11-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50127\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50127\nhttps://lore.kernel.org/linux-cve-announce/2024110557-CVE-2024-50127-c0b5@gregkh/T"], "statement": "The config param CONFIG_NET_SCH_TAPRIO enabled only for latest versions of Red Hat Enterprise Linux 9 (as a module). Issue could happen only for specific usage of taprio (for example tc qdisc taprio) and only if debug enabled (with KASAN). The potential attack complexity is high. Will be fixed in affected versions of Red Hat Enterprise Linux.", "threat_severity": "Moderate"}

{}