{ "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:\n\nnet: openvswitch: Avoid releasing netdev before teardown completes\n\nThe patch cited in the Fixes tag below changed the teardown code for\nOVS ports to no longer unconditionally take the RTNL. After this change,\nthe netdev_destroy() callback can proceed immediately to the call_rcu()\ninvocation if the IFF_OVS_DATAPATH flag is already cleared on the\nnetdev.\n\nThe ovs_netdev_detach_dev() function clears the flag before completing\nthe unregistration, and if it gets preempted after clearing the flag (as\ncan happen on an -rt kernel), netdev_destroy() can complete and the\ndevice can be freed before the unregistration completes. This leads to a\nsplat like:\n\n[ 998.393867] Oops: general protection fault, probably for non-canonical address 0xff00000001000239: 0000 [#1] SMP PTI\n[ 998.393877] CPU: 42 UID: 0 PID: 55177 Comm: ip Kdump: loaded Not tainted 6.12.0-211.1.1.el10_2.x86_64+rt #1 PREEMPT_RT\n[ 998.393886] Hardware name: Dell Inc. PowerEdge R740/0JMK61, BIOS 2.24.0 03/27/2025\n[ 998.393889] RIP: 0010:dev_set_promiscuity+0x8d/0xa0\n[ 998.393901] Code: 00 00 75 d8 48 8b 53 08 48 83 ba b0 02 00 00 00 75 ca 48 83 c4 08 5b c3 cc cc cc cc 48 83 bf 48 09 00 00 00 75 91 48 8b 47 08 <48> 83 b8 b0 02 00 00 00 74 97 eb 81 0f 1f 80 00 00 00 00 90 90 90\n[ 998.393906] RSP: 0018:ffffce5864a5f6a0 EFLAGS: 00010246\n[ 998.393912] RAX: ff00000000ffff89 RBX: ffff894d0adf5a05 RCX: 0000000000000000\n[ 998.393917] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff894d0adf5a05\n[ 998.393921] RBP: ffff894d19252000 R08: ffff894d19252000 R09: 0000000000000000\n[ 998.393924] R10: ffff894d19252000 R11: ffff894d192521b8 R12: 0000000000000006\n[ 998.393927] R13: ffffce5864a5f738 R14: 00000000ffffffe2 R15: 0000000000000000\n[ 998.393931] FS: 00007fad61971800(0000) GS:ffff894cc0140000(0000) knlGS:0000000000000000\n[ 998.393936] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 998.393940] CR2: 000055df0a2a6e40 CR3: 000000011c7fe003 CR4: 00000000007726f0\n[ 998.393944] PKRU: 55555554\n[ 998.393946] Call Trace:\n[ 998.393949] \n[ 998.393952] ? show_trace_log_lvl+0x1b0/0x2f0\n[ 998.393961] ? show_trace_log_lvl+0x1b0/0x2f0\n[ 998.393975] ? dp_device_event+0x41/0x80 [openvswitch]\n[ 998.394009] ? __die_body.cold+0x8/0x12\n[ 998.394016] ? die_addr+0x3c/0x60\n[ 998.394027] ? exc_general_protection+0x16d/0x390\n[ 998.394042] ? asm_exc_general_protection+0x26/0x30\n[ 998.394058] ? dev_set_promiscuity+0x8d/0xa0\n[ 998.394066] ? ovs_netdev_detach_dev+0x3a/0x80 [openvswitch]\n[ 998.394092] dp_device_event+0x41/0x80 [openvswitch]\n[ 998.394102] notifier_call_chain+0x5a/0xd0\n[ 998.394106] unregister_netdevice_many_notify+0x51b/0xa60\n[ 998.394110] rtnl_dellink+0x169/0x3e0\n[ 998.394121] ? rt_mutex_slowlock.constprop.0+0x95/0xd0\n[ 998.394125] rtnetlink_rcv_msg+0x142/0x3f0\n[ 998.394128] ? avc_has_perm_noaudit+0x69/0xf0\n[ 998.394130] ? __pfx_rtnetlink_rcv_msg+0x10/0x10\n[ 998.394132] netlink_rcv_skb+0x50/0x100\n[ 998.394138] netlink_unicast+0x292/0x3f0\n[ 998.394141] netlink_sendmsg+0x21b/0x470\n[ 998.394145] ____sys_sendmsg+0x39d/0x3d0\n[ 998.394149] ___sys_sendmsg+0x9a/0xe0\n[ 998.394156] __sys_sendmsg+0x7a/0xd0\n[ 998.394160] do_syscall_64+0x7f/0x170\n[ 998.394162] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 998.394165] RIP: 0033:0x7fad61bf4724\n[ 998.394188] Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d c5 e9 0c 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\n[ 998.394189] RSP: 002b:00007ffd7e2f7cb8 EFLAGS: 00000202 ORIG_RAX: 000000000000002e\n[ 998.394191] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fad61bf4724\n[ 998.394193] RDX: 0000000000000000 RSI: 00007ffd7e2f7d20 RDI: 0000000000000003\n[ 998.394194] RBP: 00007ffd7e2f7d90 R08: 0000000000000010 R09: 000000000000003f\n[ 998.394195] R10: 000055df11558010 R11: 0000000000000202 R12: 00007ffd7e2\n---truncated---", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31508" }, { "summary":"CVE-2026-31508 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-31508.json" }, { "summary":"openEuler-SA-2026-2869", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2869" }, { "summary":"CVE-2026-31508", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-31508&packageName=kernel" } ], "title":"openEuler cve CVE-2026-31508", "tracking":{ "initial_release_date":"2026-07-06T16:58:38+08:00", "revision_history":[ { "date":"2026-07-06T16:58:38+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-07-06T16:58:38+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-07-06T16:58:38+08:00", 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After this change,\nthe netdev_destroy() callback can proceed immediately to the call_rcu()\ninvocation if the IFF_OVS_DATAPATH flag is already cleared on the\nnetdev.\n\nThe ovs_netdev_detach_dev() function clears the flag before completing\nthe unregistration, and if it gets preempted after clearing the flag (as\ncan happen on an -rt kernel), netdev_destroy() can complete and the\ndevice can be freed before the unregistration completes. This leads to a\nsplat like:\n\n[ 998.393867] Oops: general protection fault, probably for non-canonical address 0xff00000001000239: 0000 [#1] SMP PTI\n[ 998.393877] CPU: 42 UID: 0 PID: 55177 Comm: ip Kdump: loaded Not tainted 6.12.0-211.1.1.el10_2.x86_64+rt #1 PREEMPT_RT\n[ 998.393886] Hardware name: Dell Inc. PowerEdge R740/0JMK61, BIOS 2.24.0 03/27/2025\n[ 998.393889] RIP: 0010:dev_set_promiscuity+0x8d/0xa0\n[ 998.393901] Code: 00 00 75 d8 48 8b 53 08 48 83 ba b0 02 00 00 00 75 ca 48 83 c4 08 5b c3 cc cc cc cc 48 83 bf 48 09 00 00 00 75 91 48 8b 47 08 <48> 83 b8 b0 02 00 00 00 74 97 eb 81 0f 1f 80 00 00 00 00 90 90 90\n[ 998.393906] RSP: 0018:ffffce5864a5f6a0 EFLAGS: 00010246\n[ 998.393912] RAX: ff00000000ffff89 RBX: ffff894d0adf5a05 RCX: 0000000000000000\n[ 998.393917] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff894d0adf5a05\n[ 998.393921] RBP: ffff894d19252000 R08: ffff894d19252000 R09: 0000000000000000\n[ 998.393924] R10: ffff894d19252000 R11: ffff894d192521b8 R12: 0000000000000006\n[ 998.393927] R13: ffffce5864a5f738 R14: 00000000ffffffe2 R15: 0000000000000000\n[ 998.393931] FS: 00007fad61971800(0000) GS:ffff894cc0140000(0000) knlGS:0000000000000000\n[ 998.393936] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 998.393940] CR2: 000055df0a2a6e40 CR3: 000000011c7fe003 CR4: 00000000007726f0\n[ 998.393944] PKRU: 55555554\n[ 998.393946] Call Trace:\n[ 998.393949] \n[ 998.393952] ? show_trace_log_lvl+0x1b0/0x2f0\n[ 998.393961] ? show_trace_log_lvl+0x1b0/0x2f0\n[ 998.393975] ? dp_device_event+0x41/0x80 [openvswitch]\n[ 998.394009] ? __die_body.cold+0x8/0x12\n[ 998.394016] ? die_addr+0x3c/0x60\n[ 998.394027] ? exc_general_protection+0x16d/0x390\n[ 998.394042] ? asm_exc_general_protection+0x26/0x30\n[ 998.394058] ? dev_set_promiscuity+0x8d/0xa0\n[ 998.394066] ? ovs_netdev_detach_dev+0x3a/0x80 [openvswitch]\n[ 998.394092] dp_device_event+0x41/0x80 [openvswitch]\n[ 998.394102] notifier_call_chain+0x5a/0xd0\n[ 998.394106] unregister_netdevice_many_notify+0x51b/0xa60\n[ 998.394110] rtnl_dellink+0x169/0x3e0\n[ 998.394121] ? rt_mutex_slowlock.constprop.0+0x95/0xd0\n[ 998.394125] rtnetlink_rcv_msg+0x142/0x3f0\n[ 998.394128] ? avc_has_perm_noaudit+0x69/0xf0\n[ 998.394130] ? __pfx_rtnetlink_rcv_msg+0x10/0x10\n[ 998.394132] netlink_rcv_skb+0x50/0x100\n[ 998.394138] netlink_unicast+0x292/0x3f0\n[ 998.394141] netlink_sendmsg+0x21b/0x470\n[ 998.394145] ____sys_sendmsg+0x39d/0x3d0\n[ 998.394149] ___sys_sendmsg+0x9a/0xe0\n[ 998.394156] __sys_sendmsg+0x7a/0xd0\n[ 998.394160] do_syscall_64+0x7f/0x170\n[ 998.394162] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 998.394165] RIP: 0033:0x7fad61bf4724\n[ 998.394188] Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d c5 e9 0c 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\n[ 998.394189] RSP: 002b:00007ffd7e2f7cb8 EFLAGS: 00000202 ORIG_RAX: 000000000000002e\n[ 998.394191] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fad61bf4724\n[ 998.394193] RDX: 0000000000000000 RSI: 00007ffd7e2f7d20 RDI: 0000000000000003\n[ 998.394194] RBP: 00007ffd7e2f7d90 R08: 0000000000000010 R09: 000000000000003f\n[ 998.394195] R10: 000055df11558010 R11: 0000000000000202 R12: 00007ffd7e2\n---truncated---", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:bpftool-debuginfo-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debuginfo-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debugsource-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-devel-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-extra-modules-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-headers-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-source-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-tools-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-tools-debuginfo-6.6.0-145.3.17.150.oe2403sp3.aarch64", 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"openEuler-24.03-LTS-SP3:python3-perf-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:python3-perf-debuginfo-6.6.0-145.3.17.150.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:bpftool-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-debugsource-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-devel-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-extra-modules-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-headers-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-source-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-tools-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-tools-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-tools-devel-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:perf-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:perf-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:python3-perf-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:python3-perf-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.17.150.oe2403sp3.src" ], "details":"kernel security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2869" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"HIGH", "baseScore":7.8, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version":"3.1" }, "products":[ "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.17.150.oe2403sp3.aarch64", 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"openEuler-24.03-LTS-SP3:kernel-tools-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-tools-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-tools-devel-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:perf-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:perf-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:python3-perf-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:python3-perf-debuginfo-6.6.0-145.3.17.150.oe2403sp3.x86_64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.17.150.oe2403sp3.src" ] } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-31508" } ] }