{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-53057", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-11-19T17:17:24.974Z", "datePublished": "2024-11-19T17:19:40.284Z", "dateUpdated": "2026-08-05T11:43:20.866Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:43:20.866Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT\n\nIn qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed\nto be either root or ingress. This assumption is bogus since it's valid\nto create egress qdiscs with major handle ffff:\nBudimir Markovic found that for qdiscs like DRR that maintain an active\nclass list, it will cause a UAF with a dangling class pointer.\n\nIn 066a3b5b2346, the concern was to avoid iterating over the ingress\nqdisc since its parent is itself. The proper fix is to stop when parent\nTC_H_ROOT is reached because the only way to retrieve ingress is when a\nhierarchy which does not contain a ffff: major handle call into\nqdisc_lookup with TC_H_MAJ(TC_H_ROOT).\n\nIn the scenario where major ffff: is an egress qdisc in any of the tree\nlevels, the updates will also propagate to TC_H_ROOT, which then the\niteration must stop.\n\n\n net/sched/sch_api.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)" } ], "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 driven entirely through rtnetlink qdisc/class configuration (RTM_NEWQDISC, RTM_NEWTCLASS, RTM_DELTCLASS) on an AF_NETLINK socket, which requires local system access. Per kernel guidance, tc/netlink qdisc bugs are Local.\nAC:L - This is a deterministic logic error, not a race — the attacker simply creates an egress qdisc with major handle ffff:, adds a class, queues a packet, drains it, and deletes the class, all under full attacker control. The affected schedulers (HTB, DRR, QFQ, HFSC, ETS) are standard, widely built modules, so no unusual configuration is needed.\nPR:L - The tc paths require CAP_NET_ADMIN checked via netlink_net_capable() against the network namespace's owning user_ns, which any unprivileged user obtains with `unshare -Urn` on distributions enabling unprivileged user namespaces. The entire attack works inside that namespace against loopback.\nUI:N - The attacker performs every step — qdisc creation, class creation, packet injection on loopback, and class deletion — with no action from any other user or administrator.\nS:U - The use-after-free corrupts kernel heap memory and yields escalation within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed drr/htb/qfq class object remains reachable through the active list, and the dequeue path reads pointers and counters out of it after an attacker has reclaimed the slot, giving heap/kernel-pointer disclosure and, via the resulting control primitives, arbitrary memory read.\nI:H - The dangling list entry is written by list_del()/list_move_tail() — a classic unlink write-what-where — and drr_dequeue() calls cl->qdisc->ops->peek() through pointers read from the attacker-controlled freed object, giving control-flow hijack and arbitrary write suitable for local privilege escalation.\nA:H - Even without full exploitation, walking the active list into freed memory and dereferencing a stale class pointer causes an immediate kernel oops or panic, and the sequence can be triggered repeatedly at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/sch_api.c" ], "versions": [ { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "e7f9a6f97eb067599a74f3bcb6761976b0ed303e", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "ce691c814bc7a3c30c220ffb5b7422715458fd9b", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "05df1b1dff8f197f1c275b57ccb2ca33021df552", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "580b3189c1972aff0f993837567d36392e9d981b", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "597cf9748c3477bf61bc35f0634129f56764ad24", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "9995909615c3431a5304c1210face5f268d24dba", "status": "affected", "versionType": "git" }, { "version": "066a3b5b2346febf9a655b444567b7138e3bb939", "lessThan": "2e95c4384438adeaa772caa560244b1a2efef816", "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_api.c" ], "versions": [ { "version": "2.6.25", "status": "affected" }, { "version": "0", "lessThan": "2.6.25", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.323", "lessThanOrEqual": "4.19.*", "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": "5.15.171", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.116", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.60", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.7", "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": "2.6.25", "versionEndExcluding": "4.19.323" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.10.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.15.171" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.1.116" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.6.60" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.11.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e" }, { "url": "https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20" }, { "url": "https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b" }, { "url": "https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552" }, { "url": "https://git.kernel.org/stable/c/580b3189c1972aff0f993837567d36392e9d981b" }, { "url": "https://git.kernel.org/stable/c/597cf9748c3477bf61bc35f0634129f56764ad24" }, { "url": "https://git.kernel.org/stable/c/9995909615c3431a5304c1210face5f268d24dba" }, { "url": "https://git.kernel.org/stable/c/2e95c4384438adeaa772caa560244b1a2efef816" } ], "title": "net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": 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"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:28:50.519Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:01:11.546Z" }, "affected": [ { "vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", 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