{ "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:net: fix use-after-free in tw_timer_handlerA real world panic issue was found as follow in Linux 5.4. BUG: unable to handle page fault for address: ffffde49a863de28 PGD 7e6fe62067 P4D 7e6fe62067 PUD 7e6fe63067 PMD f51e064067 PTE 0 RIP: 0010:tw_timer_handler+0x20/0x40 Call Trace: call_timer_fn+0x2b/0x120 run_timer_softirq+0x1ef/0x450 __do_softirq+0x10d/0x2b8 irq_exit+0xc7/0xd0 smp_apic_timer_interrupt+0x68/0x120 apic_timer_interrupt+0xf/0x20This issue was also reported since 2017 in the thread [1],unfortunately, the issue was still can be reproduced after fixingDCCP.The ipv4_mib_exit_net is called before tcp_sk_exit_batch when a netnamespace is destroyed since tcp_sk_ops is registered befroreipv4_mib_ops, which means tcp_sk_ops is in the front of ipv4_mib_opsin the list of pernet_list. There will be a use-after-free onnet->mib.net_statistics in tw_timer_handler after ipv4_mib_exit_netif there are some inflight time-wait timers.This bug is not introduced by commit f2bf415cfed7 ( mib: add net toNET_ADD_STATS_BH ) since the net_statistics is a global variableinstead of dynamic allocation and freeing. Actually, commit61a7e26028b9 ( mib: put net statistics on struct net ) introducesthe bug since it put net statistics on struct net and free it whennet namespace is destroyed.Moving init_ipv4_mibs() to the front of tcp_init() to fix this bugand replace pr_crit() with panic() since continuing is meaninglesswhen init_ipv4_mibs() fails.[1] https://groups.google.com/g/syzkaller/c/p1tn-_Kc6l4/m/smuL_FMAAgAJ?pli=1", "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-2021-46936" }, { "summary":"CVE-2021-46936 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2021/csaf-openeuler-cve-2021-46936.json" }, { "summary":"openEuler-SA-2024-1567", "category":"self", "url":"https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2024-1567" }, { "summary":"CVE-2021-46936", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail?cveId=CVE-2021-46936&packageName=kernel" } ], "title":"openEuler cve CVE-2021-46936", "tracking":{ "initial_release_date":"2024-05-11T09:17:33+08:00", "revision_history":[ { "date":"2024-05-11T09:17:33+08:00", "summary":"Initial", "number":"1.0.0" }, { "date":"2024-10-31T09:17:33+08:00", "summary":"Current version", "number":"2.0.0" } ], "generator":{ "date":"2024-10-31T09:17:33+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-10-31T09:17:33+08:00", "id":"CVE-2021-46936", "version":"2.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:20.03-LTS-SP1" }, 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BUG: unable to handle page fault for address: ffffde49a863de28 PGD 7e6fe62067 P4D 7e6fe62067 PUD 7e6fe63067 PMD f51e064067 PTE 0 RIP: 0010:tw_timer_handler+0x20/0x40 Call Trace: call_timer_fn+0x2b/0x120 run_timer_softirq+0x1ef/0x450 __do_softirq+0x10d/0x2b8 irq_exit+0xc7/0xd0 smp_apic_timer_interrupt+0x68/0x120 apic_timer_interrupt+0xf/0x20This issue was also reported since 2017 in the thread [1],unfortunately, the issue was still can be reproduced after fixingDCCP.The ipv4_mib_exit_net is called before tcp_sk_exit_batch when a netnamespace is destroyed since tcp_sk_ops is registered befroreipv4_mib_ops, which means tcp_sk_ops is in the front of ipv4_mib_opsin the list of pernet_list. There will be a use-after-free onnet->mib.net_statistics in tw_timer_handler after ipv4_mib_exit_netif there are some inflight time-wait timers.This bug is not introduced by commit f2bf415cfed7 ( mib: add net toNET_ADD_STATS_BH ) since the net_statistics is a global variableinstead of dynamic allocation and freeing. Actually, commit61a7e26028b9 ( mib: put net statistics on struct net ) introducesthe bug since it put net statistics on struct net and free it whennet namespace is destroyed.Moving init_ipv4_mibs() to the front of tcp_init() to fix this bugand replace pr_crit() with panic() since continuing is meaninglesswhen init_ipv4_mibs() fails.[1] https://groups.google.com/g/syzkaller/c/p1tn-_Kc6l4/m/smuL_FMAAgAJ?pli=1", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-20.03-LTS-SP1:python2-perf-debuginfo-4.19.90-2405.1.0.0248.oe1.aarch64", "openEuler-20.03-LTS-SP1:kernel-debugsource-4.19.90-2405.1.0.0248.oe1.aarch64", "openEuler-20.03-LTS-SP1:python3-perf-4.19.90-2405.1.0.0248.oe1.aarch64", "openEuler-20.03-LTS-SP1:kernel-source-4.19.90-2405.1.0.0248.oe1.aarch64", "openEuler-20.03-LTS-SP1:kernel-tools-debuginfo-4.19.90-2405.1.0.0248.oe1.aarch64", "openEuler-20.03-LTS-SP1:bpftool-debuginfo-4.19.90-2405.1.0.0248.oe1.aarch64", 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