CVE-2024-53164

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"baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable qdisc hierarchy (cake/choke leaf under a classful parent such as DRR/QFQ/HFSC) is built through rtnetlink RTM_NEWQDISC/RTM_NEWTCLASS and triggered by locally injected traffic on a local device, matching the tc/netlink qdisc local vector.\nAC:L - The attacker fully controls every precondition \u2014 the qdisc topology, the cake memlimit / choke limit that forces the drop, and the packet injection \u2014 making the miscounted qlen and the resulting stale active class deterministic with no race to win.\nPR:L - tc configuration requires only CAP_NET_ADMIN over the target netns, checked via namespace-relative netlink_net_capable(); an unprivileged user obtains it with `unshare -Urn` and uses the always-present `lo` device.\nUI:N - The attacker performs all steps \u2014 creating the qdisc tree, sending packets, and deleting the class \u2014 with no action by any other user.\nS:U - The corruption and its consequences remain within the kernel's own security authority; this is standard local kernel privilege escalation with no crossing into a hypervisor or IOMMU boundary.\nC:H - The missed qlen_notify() leaves a freed class linked in the parent's active list/rbtree, and the resulting use-after-free lets the attacker reclaim the slab object and read back attacker-shaped kernel memory, yielding arbitrary kernel read.\nI:H - The same use-after-free provides both a hijackable indirect call through cl->qdisc->ops->peek and unlink-style writes via list_del(&cl->alist)/rb_erase(&cl->el_node), giving control-flow hijack and arbitrary write.\nA:H - The stale class causes an immediate use-after-free oops, and even absent full exploitation the permanently non-dequeuing qdisc wedges all transmission on the device, a complete availability loss."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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{"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 ordering of qlen adjustment", "id": "2334350", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334350"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-459", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: sched: fix ordering of qlen adjustment\nChanges to sch->q.qlen around qdisc_tree_reduce_backlog() need to happen\n_before_ a call to said function because otherwise it may fail to notify\nparent qdiscs when the child is about to become empty."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent module sch_cake 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-2024-53164", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-53164\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-53164\nhttps://lore.kernel.org/linux-cve-announce/2024122746-CVE-2024-53164-752a@gregkh/T"], "statement": "The bug is in Common Applications Kept Enhanced (CAKE) queue management algorithm. The support of this algorithm enabled starting from Red Hat Enterprise Linux 9.2. It is disabled by default (can be enabled by tc qdisc cake command). The security impact of this issue is limited.", "threat_severity": "Low"}

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