{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:bpf: Fix too early release of tcx_entryPedro Pinto and later independently also Hyunwoo Kim and Wongi Lee reportedan issue that the tcx_entry can be released too early leading to a useafter free (UAF) when an active old-style ingress or clsact qdisc with ashared tc block is later replaced by another ingress or clsact instance.Essentially, the sequence to trigger the UAF (one example) can be as follows: 1. A network namespace is created 2. An ingress qdisc is created. This allocates a tcx_entry, and &tcx_entry->miniq is stored in the qdisc s miniqp->p_miniq. At the same time, a tcf block with index 1 is created. 3. chain0 is attached to the tcf block. chain0 must be connected to the block linked to the ingress qdisc to later reach the function tcf_chain0_head_change_cb_del() which triggers the UAF. 4. Create and graft a clsact qdisc. This causes the ingress qdisc created in step 1 to be removed, thus freeing the previously linked tcx_entry: rtnetlink_rcv_msg() => tc_modify_qdisc() => qdisc_create() => clsact_init() [a] => qdisc_graft() => qdisc_destroy() => __qdisc_destroy() => ingress_destroy() [b] => tcx_entry_free() => kfree_rcu() // tcx_entry freed 5. Finally, the network namespace is closed. This registers the cleanup_net worker, and during the process of releasing the remaining clsact qdisc, it accesses the tcx_entry that was already freed in step 4, causing the UAF to occur: cleanup_net() => ops_exit_list() => default_device_exit_batch() => unregister_netdevice_many() => unregister_netdevice_many_notify() => dev_shutdown() => qdisc_put() => clsact_destroy() [c] => tcf_block_put_ext() => tcf_chain0_head_change_cb_del() => tcf_chain_head_change_item() => clsact_chain_head_change() => mini_qdisc_pair_swap() // UAFThere are also other variants, the gist is to add an ingress (or clsact)qdisc with a specific shared block, then to replace that qdisc, waitingfor the tcx_entry kfree_rcu() to be executed and subsequently accessingthe current active qdisc s miniq one way or another.The correct fix is to turn the miniq_active boolean into a counter. Whatcan be observed, at step 2 above, the counter transitions from 0->1, atstep [a] from 1->2 (in order for the miniq object to remain active duringthe replacement), then in [b] from 2->1 and finally [c] 1->0 with theeventual release. The reference counter in general ranges from [0,2] andit does not need to be atomic since all access to the counter is protectedby the rtnl mutex. With this in place, there is no longer a UAF happeningand the tcx_entry is freed at the correct time.", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-41010" }, { "summary":"CVE-2024-41010 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-41010.json" }, { "summary":"openEuler-SA-2024-1960", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1960" }, { "summary":"CVE-2024-41010", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-41010&packageName=kernel" } ], "title":"openEuler cve CVE-2024-41010", "tracking":{ "initial_release_date":"2024-08-09T21:03:11+08:00", "revision_history":[ { "date":"2024-08-09T21:03:11+08:00", "summary":"Initial", "number":"1.0.0" }, { "date":"2024-08-13T10:03:00+08:00", "summary":"Current version", "number":"2.0.0" }, { "date":"2024-08-19T17:36:01+08:00", "summary":"Current version", "number":"3.0.0" } ], "generator":{ "date":"2024-08-19T17:36:01+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-08-19T17:36:01+08:00", "id":"CVE-2024-41010", "version":"3.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"openEuler-24.03-LTS", "name":"openEuler-24.03-LTS" }, "name":"openEuler-24.03-LTS", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ 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Hyunwoo Kim and Wongi Lee reportedan issue that the tcx_entry can be released too early leading to a useafter free (UAF) when an active old-style ingress or clsact qdisc with ashared tc block is later replaced by another ingress or clsact instance.Essentially, the sequence to trigger the UAF (one example) can be as follows: 1. A network namespace is created 2. An ingress qdisc is created. This allocates a tcx_entry, and &tcx_entry->miniq is stored in the qdisc s miniqp->p_miniq. At the same time, a tcf block with index 1 is created. 3. chain0 is attached to the tcf block. chain0 must be connected to the block linked to the ingress qdisc to later reach the function tcf_chain0_head_change_cb_del() which triggers the UAF. 4. Create and graft a clsact qdisc. This causes the ingress qdisc created in step 1 to be removed, thus freeing the previously linked tcx_entry: rtnetlink_rcv_msg() => tc_modify_qdisc() => qdisc_create() => clsact_init() [a] => qdisc_graft() => qdisc_destroy() => __qdisc_destroy() => ingress_destroy() [b] => tcx_entry_free() => kfree_rcu() // tcx_entry freed 5. Finally, the network namespace is closed. This registers the cleanup_net worker, and during the process of releasing the remaining clsact qdisc, it accesses the tcx_entry that was already freed in step 4, causing the UAF to occur: cleanup_net() => ops_exit_list() => default_device_exit_batch() => unregister_netdevice_many() => unregister_netdevice_many_notify() => dev_shutdown() => qdisc_put() => clsact_destroy() [c] => tcf_block_put_ext() => tcf_chain0_head_change_cb_del() => tcf_chain_head_change_item() => clsact_chain_head_change() => mini_qdisc_pair_swap() // UAFThere are also other variants, the gist is to add an ingress (or clsact)qdisc with a specific shared block, then to replace that qdisc, waitingfor the tcx_entry kfree_rcu() to be executed and subsequently accessingthe current active qdisc s miniq one way or another.The correct fix is to turn the miniq_active boolean into a counter. Whatcan be observed, at step 2 above, the counter transitions from 0->1, atstep [a] from 1->2 (in order for the miniq object to remain active duringthe replacement), then in [b] from 2->1 and finally [c] 1->0 with theeventual release. The reference counter in general ranges from [0,2] andit does not need to be atomic since all access to the counter is protectedby the rtnl mutex. With this in place, there is no longer a UAF happeningand the tcx_entry is freed at the correct time.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-devel-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-headers-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-source-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-debuginfo-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-devel-6.6.0-37.0.0.44.oe2403.aarch64", 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