{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/amazonlinux2els/vex/2026/cve-2026-74289-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-10-23T12:29:20Z", "generator": { "date": "2026-10-23T12:29:20Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-74289-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-08-15T06:22:00Z", "revision_history": [ { "date": "2026-08-15T06:22:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-23T12:29:20Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"full_product_name": { "name": "kernel-tools-0:5.10.272-271.1109.amzn2.x86_64 as a component of Amazon Linux 2", "product_id": "Amazon-Linux-2:kernel-tools-0:5.10.272-271.1109.amzn2.x86_64" }, "product_reference": "kernel-tools-0:5.10.272-271.1109.amzn2.x86_64", "relates_to_product_reference": "Amazon-Linux-2" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-74289", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: Don't dump dying fib_info in fib_leaf_notify().\n\nsyzbot reported use-after-free in nsim_fib4_prepare_event(). [0]\n\nThe problem is that the following functions call fib_info_hold() /\nrefcount_inc() while dumping fib_info under RCU, which is unsafe.\n\n * mlxsw_sp_router_fib4_event()\n * rocker_router_fib_event()\n * nsim_fib4_prepare_event()\n\nrefcount_inc_not_zero() must be used, but it would be too late\nthere.\n\nLet's guarantee the lifetime of fib_info in fib_leaf_notify().\n\nNote that IPv6 does not need the corresponding change since\nfib6_table_dump() holds fib6_table.tb6_lock.\n\n[0]:\nrefcount_t: addition on 0; use-after-free.\nWARNING: lib/refcount.c:25 at refcount_warn_saturate+0x9f/0x110 lib/refcount.c:25, CPU#0: kworker/u8:15/3420\nModules linked in:\nCPU: 0 UID: 0 PID: 3420 Comm: kworker/u8:15 Not tainted syzkaller #0 PREEMPT_{RT,(full)}\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026\nWorkqueue: netns cleanup_net\nRIP: 0010:refcount_warn_saturate+0x9f/0x110 lib/refcount.c:25\nCode: eb 66 85 db 74 3e 83 fb 01 75 4c e8 1b f1 22 fd 48 8d 3d 84 cb f1 0a 67 48 0f b9 3a eb 4a e8 08 f1 22 fd 48 8d 3d 81 cb f1 0a <67> 48 0f b9 3a eb 37 e8 f5 f0 22 fd 48 8d 3d 7e cb f1 0a 67 48 0f\nRSP: 0018:ffffc9000f2c7270 EFLAGS: 00010293\nRAX: ffffffff84a18858 RBX: 0000000000000002 RCX: ffff888032ff9ec0\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8f9353e0\nRBP: 0000000000000000 R08: ffff888032ff9ec0 R09: 0000000000000005\nR10: 0000000000000100 R11: 0000000000000004 R12: ffff8880570cc000\nR13: dffffc0000000000 R14: ffff88802b40563c R15: ffff8880570cc000\nFS: 0000000000000000(0000) GS:ffff888126173000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fb1f4d5d000 CR3: 000000006072a000 CR4: 00000000003526f0\nCall Trace:\n \n __refcount_add include/linux/refcount.h:-1 [inline]\n __refcount_inc include/linux/refcount.h:366 [inline]\n refcount_inc include/linux/refcount.h:383 [inline]\n fib_info_hold include/net/ip_fib.h:629 [inline]\n nsim_fib4_prepare_event drivers/net/netdevsim/fib.c:930 [inline]\n nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1000 [inline]\n nsim_fib_event_nb+0x1055/0x1240 drivers/net/netdevsim/fib.c:1043\n call_fib_notifier+0x45/0x80 net/core/fib_notifier.c:25\n call_fib_entry_notifier net/ipv4/fib_trie.c:90 [inline]\n fib_leaf_notify net/ipv4/fib_trie.c:2176 [inline]\n fib_table_notify net/ipv4/fib_trie.c:2194 [inline]\n fib_notify+0x36b/0x5e0 net/ipv4/fib_trie.c:2217\n fib_net_dump net/core/fib_notifier.c:70 [inline]\n register_fib_notifier+0x184/0x360 net/core/fib_notifier.c:108\n nsim_fib_create+0x85d/0x9f0 drivers/net/netdevsim/fib.c:1596\n nsim_dev_reload_create drivers/net/netdevsim/dev.c:1604 [inline]\n nsim_dev_reload_up+0x374/0x7c0 drivers/net/netdevsim/dev.c:1058\n devlink_reload+0x501/0x8d0 net/devlink/dev.c:475\n devlink_pernet_pre_exit+0x1ff/0x420 net/devlink/core.c:558\n ops_pre_exit_list net/core/net_namespace.c:161 [inline]\n ops_undo_list+0x187/0x940 net/core/net_namespace.c:234\n cleanup_net+0x56e/0x800 net/core/net_namespace.c:702\n process_one_work kernel/workqueue.c:3314 [inline]\n process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397\n worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n ", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64" ], "known_affected": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:perf-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-74289" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/06b693d2eb6651a63ad85bad8673de3b7d4edd6d", "url": "https://git.kernel.org/stable/c/06b693d2eb6651a63ad85bad8673de3b7d4edd6d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/676482da8d938ea72c26da0fc86af2d2ec238ab2", "url": "https://git.kernel.org/stable/c/676482da8d938ea72c26da0fc86af2d2ec238ab2" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7907a395701b339c2d68f37456d395e953c74795", "url": "https://git.kernel.org/stable/c/7907a395701b339c2d68f37456d395e953c74795" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7980a13add57f97c5da1dc961d0145a6ad2a7f98", "url": "https://git.kernel.org/stable/c/7980a13add57f97c5da1dc961d0145a6ad2a7f98" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/8bdb20b8a581495062b5879f4e9d435da648b3b0", "url": "https://git.kernel.org/stable/c/8bdb20b8a581495062b5879f4e9d435da648b3b0" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/bea03e887db5a8a79234531faf14cf2c4d8816c3", "url": "https://git.kernel.org/stable/c/bea03e887db5a8a79234531faf14cf2c4d8816c3" } ], "release_date": "2026-08-15T06:22:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-10-19T09:19:41.057926Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1792401579", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1792401579" }, { "category": "none_available", "date": "2026-08-15T06:22:00Z", "details": "Affected", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.272-271.1109.amzn2.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", 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"Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }